MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR JANUARY 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 0 29 02 02 97 -0.3 98 9.4 -0.6 -4.6 2.4 3.1 5.1 6.5 6.9 8.0 40 0 12.8 3.3 000010 1010.0 6.0 3.2 1.0
02 8 19 05 61 94 8.8 98 12.3 -0.3 2.9 6.3 5.8 6.0 6.4 6.6 7.9 20 0 7.4 0.3 000000 978.0 7.4 0.0 1.1
03 8 24 13 61 97 10.2 90 10.4 6.3 1.2 8.6 7.5 6.9 6.5 6.7 7.9 20 0 6.3 1.0 001000 985.5 2.8 0.0 1.1
04 8 17 13 60 96 8.2 90 8.7 4.7 0.0 4.9 4.4 5.5 6.5 6.7 7.9 20 0 9.1 0.1 005100 993.0 2.5 0.0 1.8
05 8 21 09 60 97 3.5 89 6.5 3.5 1.6 3.9 3.9 5.1 5.2 6.5 7.9 10 0 8.7 3.9 000000 995.5 4.2 0.0 0.5
06 1 22 02 02 97 -0.5 98 11.7 -0.8 -5.2 1.4 1.9 4.0 5.6 6.2 7.6 50 0 3.3 0.0 000000 1011.5 3.4 1.5 1.0
07 8 27 09 02 97 8.4 73 10.7 -0.5 2.6 5.1 4.9 5.6 5.8 5.8 7.5 10 0 2.8 4.7 000000 1004.5 2.4 0.0 1.4
08 8 24 09 02 97 10.5 84 12.6 5.1 0.1 5.1 4.5 5.2 5.9 6.1 7.4 10 0 0.1 0.0 000000 1013.5 0.1 0.0 1.6
09 7 22 05 02 97 12.6 90 14.4 10.5 9.5 8.9 8.3 7.8 6.9 6.4 7.4 10 0 0.0 4.3 000000 1022.5 0.0 0.0 1.0
10 3 00 00 02 15 4.3 98 12.7 4.2 -0.5 4.8 5.1 6.5 7.1 6.9 7.5 10 0 tr 6.8 000000 1022.0 0.0 0.0 0.6
11 7 23 05 02 94 5.3 98 10.7 3.6 -1.6 4.2 4.3 5.8 6.8 6.9 7.6 10 0 tr 1.2 000000 1015.0 0.0 0.0 0.6
12 8 19 02 02 96 10.6 94 11.1 5.3 3.6 7.8 7.2 7.0 6.9 6.8 7.7 10 0 0.1 0.0 000000 1015.0 0.2 0.0 0.4
13 8 20 05 02 97 9.5 88 11.9 8.1 4.0 7.7 7.3 7.7 7.5 7.1 7.8 10 0 6.3 2.9 000000 1002.5 9.0 0.0 0.8
14 7 33 09 02 97 8.2 77 9.7 7.4 5.7 7.5 7.5 7.9 7.8 7.4 7.9 10 0 1.1 4.8 000000 1005.0 3.0 0.0 1.0
15 7 22 02 02 97 10.6 92 11.4 3.1 -1.9 7.1 6.6 6.8 7.2 7.4 7.9 20 0 0.4 4.1 000000 1009.0 0.2 0.0 0.6
16 5 30 02 02 97 7.0 94 9.4 4.2 -1.6 4.7 4.8 6.1 7.1 7.3 8.0 10 0 0.0 5.1 000000 1007.5 0.0 0.0 1.0
17 3 10 02 02 97 5.3 83 9.9 2.9 -2.1 4.1 4.3 5.5 6.5 6.9 8.0 10 0 2.8 0.9 000000 1024.5 3.9 0.0 1.6
18 8 27 09 60 97 9.5 93 9.5 5.3 6.1 7.1 6.4 6.9 6.9 6.8 7.9 10 0 7.2 0.0 000000 992.5 10.5 0.0 0.7
19 7 31 09 02 97 7.1 81 7.1 6.2 4.5 6.1 6.1 6.6 7.0 6.8 7.9 10 0 0.0 0.5 000000 1003.5 0.0 0.0 1.8
20 0 36 09 02 97 1.0 78 5.1 0.7 -2.8 1.1 1.7 4.0 6.0 6.5 7.9 40 0 0.0 5.1 000000 1028.5 0.0 3.5 0.8
21 8 04 02 02 97 1.5 92 5.9 -1.5 -6.2 2.1 2.1 2.5 5.1 5.8 7.6 10 0 0.0 0.1 000000 1037.0 0.0 3.2 0.6
22 8 16 02 02 96 4.6 89 6.0 1.5 -0.1 3.7 3.9 4.7 5.3 5.6 7.4 10 0 0.0 0.0 000000 1033.0 0.0 1.0 0.6
23 0 06 02 02 96 -0.3 91 4.3 -1.9 -6.6 1.1 1.7 3.8 5.2 5.6 7.2 40 0 0.0 0.3 000000 1032.5 0.0 9.3 1.0
24 0 04 05 02 97 3.8 77 7.2 -0.3 -2.5 2.7 2.9 4.1 5.0 5.3 7.1 10 0 0.0 5.4 000000 1034.5 0.0 0.0 1.9
25 7 04 13 02 97 3.1 64 4.7 2.5 -2.5 2.2 2.2 3.5 4.7 5.2 7.0 10 0 0.0 0.0 000000 1034.5 0.0 0.0 1.8
26 7 09 09 02 97 2.7 77 5.8 2.2 -1.5 1.9 2.1 3.4 4.5 5.0 6.8 10 0 0.0 6.2 000000 1035.0 0.0 0.0 1.2
27 7 09 05 02 97 2.8 82 4.1 0.5 -4.4 2.2 1.9 3.1 4.4 4.8 6.6 10 0 0.1 0.0 000000 1027.5 0.4 0.0 0.6
28 8 09 02 02 97 2.8 80 5.6 1.8 -1.2 2.3 2.5 3.8 4.4 4.6 6.5 10 0 0.1 3.9 000000 1025.0 0.6 3.1 0.6
29 8 00 00 02 94 3.8 96 7.1 -1.5 -6.6 2.8 2.4 3.0 4.1 4.6 6.4 10 0 0.0 0.0 000000 1025.5 0.0 3.0 0.4
30 7 00 00 02 95 1.2 94 8.1 0.2 -4.4 1.9 2.1 3.5 4.4 4.6 6.3 10 0 0.0 1.2 000000 1023.0 0.0 0.0 0.5
31 8 00 00 02 96 4.5 90 6.1 1.2 1.6 3.7 3.4 4.2 4.7 4.6 6.3 10 0 0.3 0.0 000000 1021.5 0.4 0.0 0.8
-----------------------------------------------------------------------------------------------------------------
Mean
6.0 5.2 5.5 88 8.7 2.7 -0.4 4.4 4.3 5.2 5.9 6.1 7.4 1015.1
Total 68.9 66.1 57.0 27.8 30.4
1961-1990 Climatological
Mean5.5 6.7 89 7.1 1.1 -0.8 3.3 3.3 4.1 4.7 5.4 6.6 57.3 46.4 1015.1 57
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 3.6; 50% snow cover at 09h days 0; mean 3.5;
Hail days 1; mean 0.0; Ice pellets days 1; mean 0.3;
Thunder days 1; mean 0.3; Fog at 09h days 0; mean 2.5;
Gale days 1; mean 0.7;
Air frost days 8; mean 11.5; Days with 0.2mm rain days 13; mean 17.2*
Grass minimum frost days 18; mean 17.8; Days with 1.0mm rain days 11; mean 11.9*
Soil frost days 8 Days with 5.0mm rain days 7; mean 4.8*
Concrete frost days 10 Days with no sun days 9; mean 14.0
Minimum relative humidity - 65%/4th; Air pressure: max - 1037.0mb/21st, min - 978.0mb/2nd
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (02 sky not changing, 60 intermittent light rain, 61 continous light rain)
09GMT observations...
Temp temperature (degC); RH relative humidity (%);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 40 frozen, 50 glaze;
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evapoartion (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
14.4C on the 9th was the highest January temperature since 1975.
Correction to December 1997: Minimum temperature on the 25th was 7.9C.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR FEBRUARY 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 7 05 02 02 97 -1.3 85 3.5 -1.7 -5.7 0.9 1.3 3.0 4.4 4.8 6.2 40 0 0.0 6.3 000000 1021.0 0.0 16.2 0.7
02 4 35 02 02 96 -0.5 94 7.9 -4.0 -8.2 0.2 0.4 2.1 3.5 4.4 6.1 40 0 0.0 6.9 000000 1016.0 0.0 10.5 0.6
03 1 27 02 02 97 -0.1 97 7.0 -2.8 -7.0 0.5 0.7 2.1 3.5 4.0 6.0 40 0 0.0 7.2 000000 1017.5 0.0 14.6 0.5
04 2 27 02 02 96 0.2 95 10.4 -3.8 -8.0 0.0 0.4 1.8 3.1 3.7 5.9 40 0 0.0 6.0 000000 1017.0 0.0 8.8 0.6
05 8 25 02 03 96 5.0 91 11.1 0.3 -5.3 0.8 1.0 2.1 3.2 3.7 5.7 10 0 tr 2.1 000000 1022.5 0.0 0.0 0.9
06 8 00 00 02 96 7.5 87 9.6 5.0 1.5 3.9 3.7 4.1 4.0 4.0 5.5 10 0 2.7 0.1 000000 1022.5 2.0 0.0 1.2
07 1 28 02 02 97 4.7 92 10.0 3.5 -0.5 4.1 3.9 4.9 4.8 4.4 5.6 10 0 0.0 6.0 000000 1018.5 0.0 0.0 0.8
08 2 23 02 02 97 1.3 83 11.8 -0.7 -5.5 1.3 1.7 3.4 4.6 4.7 5.9 10 0 0.0 4.3 000000 1022.5 0.0 3.2 1.1
09 8 22 02 02 97 8.8 90 11.2 1.3 3.0 5.8 5.2 5.1 5.1 4.8 5.9 10 0 0.0 1.5 000000 1025.0 0.0 0.0 0.9
10 8 23 02 02 97 9.0 85 13.2 6.5 -0.8 5.8 5.4 6.0 5.9 5.4 6.0 10 0 0.0 2.1 000000 1027.0 0.0 0.0 1.3
11 8 22 05 02 97 9.8 87 14.9 8.1 4.0 7.1 6.7 6.8 6.4 5.7 6.1 10 0 0.0 2.5 000000 1027.0 0.0 0.0 1.2
12 8 21 05 02 94 10.0 95 14.8 7.2 1.7 6.5 6.1 6.9 6.9 6.3 6.3 10 0 0.0 2.3 000000 1029.0 0.0 0.0 0.8
13 4 00 00 02 94 9.5 90 18.4 7.2 1.5 6.2 6.5 7.4 7.3 6.6 6.6 10 0 0.0 8.8 000000 1034.0 0.0 0.0 1.2
14 9 00 00 43 02 4.0 99 17.3 3.0 -1.5 5.4 5.6 6.8 7.3 6.8 6.8 10 0 0.0 8.5 000001 1033.5 0.0 0.0 1.2
15 9 00 00 43 01 5.0 98 16.2 3.3 -1.5 5.0 5.3 6.0 7.1 6.8 6.8 10 0 0.0 3.5 000001 1031.5 0.0 0.0 1.7
16 7 27 05 02 97 10.7 78 13.3 5.0 4.0 6.0 6.3 7.7 7.6 6.9 7.0 10 0 tr 2.5 000000 1023.5 0.0 0.0 1.5
17 0 27 02 02 97 6.2 92 14.6 4.1 -3.5 4.2 4.8 5.9 7.7 7.1 7.3 10 0 0.0 8.5 000000 1038.5 0.0 0.0 0.8
18 9 22 02 43 02 4.4 98 12.6 3.5 -1.5 4.6 4.9 6.6 7.2 7.2 7.3 10 0 tr 4.0 000001 1035.0 0.0 0.0 0.8
19 8 18 02 02 95 10.5 92 14.1 4.4 2.0 6.0 6.2 7.1 7.4 7.3 7.4 10 0 0.0 0.0 000000 1029.0 0.0 0.0 0.8
20 7 18 05 02 97 9.3 91 15.8 8.8 5.0 6.0 6.4 7.5 7.7 7.5 7.5 10 0 0.0 1.0 000000 1020.5 0.0 0.0 1.4
21 7 22 05 02 97 11.5 83 12.6 9.3 7.0 6.9 7.5 8.6 8.2 7.7 7.6 10 0 2.7 2.0 000000 1010.5 1.1 0.0 1.0
22 1 27 02 02 97 5.4 81 11.7 2.6 -2.5 4.2 5.0 6.4 7.7 7.6 7.7 10 0 0.4 8.5 000000 1021.5 0.3 0.0 1.1
23 3 18 02 02 97 6.0 96 11.8 1.1 -3.8 4.7 5.2 6.1 6.9 7.3 7.6 10 0 0.0 0.0 000000 1035.0 2.0 0.0 0.3
24 7 00 00 02 95 7.8 97 11.6 4.3 -1.0 4.4 4.5 6.1 7.0 7.1 7.6 10 0 0.0 0.1 000000 1038.5 0.0 0.0 0.8
25 5 00 00 02 97 7.2 93 14.7 0.6 -3.5 4.1 4.1 6.1 7.1 7.1 7.6 10 0 0.0 8.5 000000 1040.5 0.0 0.0 1.5
26 8 26 02 02 97 7.3 77 9.8 2.9 -2.4 5.5 5.3 5.9 6.9 7.0 7.5 10 0 0.1 0.0 000000 1034.0 0.1 0.0 1.2
27 8 27 09 02 97 8.7 65 10.2 7.3 5.4 6.8 6.6 7.0 7.1 7.0 7.5 10 0 2.0 0.2 000000 1022.0 0.6 0.0 2.1
28 2 30 05 02 97 5.6 66 8.8 3.0 -1.2 4.0 4.8 6.6 7.4 7.1 7.5 10 0 0.3 6.3 100000 1014.5 0.3 0.0 1.5
-----------------------------------------------------------------------------------------------------------------
Mean
5.3 2.5 6.2 89 12.1 3.2 -1.0 4.3 4.5 5.6 6.2 6.1 6.7 1026.0
Total 8.2 109.7 6.4 53.3 29.5
1961-1990 Climatological
Mean5.7 6.5 88 7.8 1.3 -1.3 2.9 3.3 4.1 4.6 5.1 6.0 39.3 65.2 1015.5 43
-----------------------------------------------------------------------------------------------------------------
Snow days 1; mean 3.4; 50% snow cover at 09h days 0; mean 2.1;
Hail days 0; mean 0.2; Ice pellets days 0; mean 0.4;
Thunder days 0; mean 0.2; Fog at 09h days 3; mean 2.0;
Gale days 0; mean 0.4;
Air frost days 5; mean 10.0; Days with 0.2mm rain days 5; mean 12.6*
Grass minimum frost days 18; mean 17.7; Days with 1.0mm rain days 3; mean 8.4*
Soil frost days 9 Days with 5.0mm rain days 0; mean 3.0*
Concrete frost days 8 Days with no sun days 3; mean 9.5
Minimum relative humidity - 55%/27th; Air pressure: max - 1040.5mb/25th, min - 1010.0mb/21st
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 43 fog)
09GMT observations...
Temp temperature (degC); RH relative humidity (%);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 40 frozen, 50 glaze;
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
Notes: 2nd Mildest February since 1863 (0.5degC warmer in 1990), sunniest February since 1988
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR MARCH 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 7 31 05 02 97 5.5 78 11.3 0.0 -5.1 3.6 3.4 4.9 6.6 6.9 7.6 10 0 tr 4.5 000000 1015.0 0.0 0.0 1.6
02 7 25 05 02 97 8.1 87 12.0 5.5 0.5 5.3 5.1 6.0 6.7 6.8 7.5 10 0 8.8 0.4 000000 1016.5 9.4 0.0 1.1
03 8 22 05 61 97 12.0 93 14.4 8.1 2.5 9.2 8.3 7.8 7.3 7.0 7.5 10 0 6.1 0.0 000000 1000.5 6.6 0.0 1.3
04 8 22 09 61 96 10.6 88 11.6 10.6 9.7 9.6 9.9 9.4 8.3 7.4 7.5 10 0 0.0 7.1 000000 998.5 0.0 0.0 2.0
05 1 22 13 02 97 8.7 71 12.6 4.9 1.1 4.4 5.1 7.0 8.1 7.8 7.7 10 0 9.6 6.0 000000 1016.5 8.1 0.0 1.6
06 8 23 02 61 95 11.0 91 12.4 7.0 4.2 8.1 7.7 7.9 8.0 7.7 7.9 10 0 6.7 0.0 000000 1012.0 10.9 0.0 0.7
07 7 24 05 02 97 10.8 80 14.2 10.0 4.1 9.4 8.9 8.9 8.5 8.0 7.9 10 0 2.1 5.8 000000 1005.0 1.0 0.0 1.8
08 7 27 02 02 97 8.8 90 10.4 8.1 4.9 7.8 7.7 8.5 8.7 8.3 8.0 10 0 0.6 9.4 000000 1010.0 0.4 0.0 1.2
09 0 18 02 02 97 2.9 91 11.0 -1.7 -4.8 2.7 3.7 6.4 8.1 8.1 8.1 10 0 0.0 6.8 000000 1029.5 0.0 5.4 1.3
10 8 18 05 02 97 5.6 80 8.4 -2.2 -5.7 2.7 3.1 5.5 7.4 7.8 8.1 10 0 7.6 0.1 000000 1027.0 9.4 6.9 1.2
11 8 32 13 60 97 7.5 89 10.0 5.6 4.9 6.6 6.4 6.9 7.1 7.4 8.0 10 0 0.2 4.6 000000 1014.5 0.7 0.0 2.2
12 5 28 05 03 97 6.0 80 8.9 2.3 -2.5 3.1 3.8 5.6 7.0 7.1 7.9 10 0 1.0 2.4 000000 1029.5 2.7 0.0 1.2
13 8 29 02 02 96 8.9 93 12.0 5.8 5.2 6.8 6.6 7.0 7.1 7.0 7.8 10 0 0.0 0.1 000000 1028.0 0.0 0.0 1.2
14 8 33 02 02 96 5.7 97 11.6 1.1 -2.2 5.6 5.2 6.5 7.4 7.2 7.7 10 0 0.0 1.9 000000 1033.0 0.0 0.0 1.2
15 8 32 02 02 97 9.6 79 10.9 5.7 7.0 8.0 7.7 7.9 7.6 7.3 7.7 10 0 0.0 0.0 000000 1034.5 0.0 0.0 1.2
16 8 30 02 02 97 9.1 77 10.9 8.0 6.5 7.6 7.5 8.0 8.0 7.4 7.8 10 0 0.0 0.0 000000 1033.0 0.0 0.0 1.3
17 7 28 02 01 97 9.8 84 13.0 8.3 7.1 8.1 7.9 8.4 8.3 7.7 7.9 10 0 0.0 0.0 000000 1032.5 0.0 0.0 0.9
18 2 32 02 02 97 7.3 89 15.3 2.4 -1.1 5.5 6.1 8.1 8.5 8.0 8.0 10 0 0.0 5.4 000000 1037.5 0.0 0.0 2.0
19 4 04 02 01 97 7.6 82 13.9 3.4 -0.8 5.4 6.0 7.9 8.5 8.2 8.1 10 0 0.0 9.7 000000 1043.0 0.0 0.0 1.6
20 0 30 02 02 97 8.6 90 15.0 1.4 -1.6 4.8 5.4 7.4 8.5 8.2 8.1 10 0 0.0 5.7 000000 1040.5 0.0 0.0 2.0
21 8 33 05 02 97 9.4 78 10.9 8.5 6.8 8.6 8.3 8.9 8.9 8.3 8.3 10 0 0.0 0.0 000000 1038.0 0.0 0.0 1.7
22 8 02 05 02 97 7.7 76 13.0 6.7 5.5 8.2 7.8 8.4 8.6 8.3 8.4 00 0 0.0 4.4 000000 1038.0 0.0 0.0 1.2
23 7 33 02 02 96 6.8 91 10.4 1.7 -1.6 6.1 6.3 7.7 8.4 8.4 8.4 00 0 0.0 0.0 000000 1034.0 0.0 0.0 1.6
24 8 20 02 02 97 4.0 83 10.4 2.8 0.4 5.5 5.8 7.5 8.0 8.1 8.4 00 0 4.2 0.0 000000 1034.0 7.0 0.0 1.6
25 8 18 05 63 94 6.8 95 10.3 4.0 4.2 7.1 7.1 7.9 8.2 8.0 8.4 10 0 3.6 0.0 000000 1029.0 11.2 0.0 0.5
26 8 22 09 61 97 10.3 93 12.0 6.8 7.0 8.2 7.8 8.4 8.1 7.9 8.4 10 0 2.1 0.2 000000 1016.0 4.1 0.0 0.4
27 8 21 02 02 97 12.0 96 14.8 10.3 7.9 9.9 9.4 9.4 8.8 8.1 8.4 10 0 0.0 0.1 000000 1017.0 0.0 0.0 1.0
28 8 24 02 02 97 11.9 87 16.5 8.7 5.3 9.4 8.9 9.6 9.3 8.5 8.4 10 0 0.5 1.2 000000 1015.5 2.0 0.0 0.7
29 8 25 02 02 96 13.3 84 17.1 9.8 5.9 10.2 10.0 10.0 9.6 8.9 8.5 10 0 0.3 0.0 000000 1009.5 0.2 0.0 1.2
30 8 25 02 02 95 13.4 92 15.0 12.9 12.0 11.6 11.4 11.1 10.1 9.2 8.7 10 0 tr 0.2 000000 1011.0 0.0 0.0 0.2
31 7 09 02 03 95 7.0 95 15.4 3.5 0.9 7.2 8.2 9.7 10.3 9.5 8.9 10 0 0.8 5.0 000000 1018.0 0.8 0.0 0.2
-----------------------------------------------------------------------------------------------------------------
Mean
6.6 4.0 8.6 86 12.4 5.5 2.8 7.0 7.0 7.9 8.2 7.9 8.1 1023.1
Total 54.2 81.0 74.5 12.3 38.9
1961-1990 Climatological
Mean6.0 6.3 83 10.7 2.7 0.0 4.6 4.9 5.8 5.9 6.2 6.4 51.6 106.1 1015.0 57
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 2.7; 50% snow cover at 09h days 0; mean 0.6;
Hail days 0; mean 0.5; Ice pellets days 0; mean 0.5;
Thunder days 0; mean 0.5; Fog at 09h days 0; mean 0.8;
Gale days 0; mean 0.4;
Air frost days 2; mean 6.4; Days with 0.2mm rain days 15; mean 15.3*
Grass minimum frost days 9; mean 15.5; Days with 1.0mm rain days 10; mean 10.6*
Soil frost days 3 Days with 5.0mm rain days 5; mean 3.9*
Concrete frost days 3 Days with no sun days 10; mean 6.4
Minimum relative humidity - 49%/5th; Air pressure: max - 1043.0mb/19th, min - 992.5mb/4th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (02 sky not changing, 03 cloud increasing, 21 recent rain, 44,45,47 fog,
80 light rain shower);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 40 frozen, 50 glaze;
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
Notes: 12.9C min temp on 30th was highest March value for over 45 years. The month was cooler then March 1997.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR APRIL 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 7 09 02 02 94 8.2 96 11.9 6.9 3.4 8.8 9.2 10.3 10.5 9.6 9.1 10 0 3.8 0.2 000000 1012.5 4.0 0.0 2.2
02 7 14 02 02 96 10.3 90 14.9 8.1 3.6 9.4 9.9 10.4 10.3 9.6 9.2 10 0 3.6 2.7 000000 1005.0 1.8 0.0 1.3
03 7 18 02 03 97 8.0 79 12.9 8.6 5.2 8.9 9.3 10.5 10.6 9.7 9.4 10 0 6.8 2.8 004100 989.0 4.0 0.0 2.0
04 7 20 09 25 97 11.4 79 13.5 7.4 6.2 9.4 9.3 10.0 10.3 9.8 9.4 20 0 11.5 1.8 000000 984.5 2.7 0.0 2.0
05 6 23 09 25 97 10.8 71 13.8 8.0 5.0 9.2 8.9 9.7 10.2 9.8 9.5 10 0 8.1 2.8 004000 994.0 3.4 0.0 1.0
06 8 25 02 02 97 8.1 90 15.4 7.4 3.9 9.0 9.2 10.0 10.4 9.7 9.5 10 0 1.6 6.7 000000 1000.5 1.0 0.0 1.1
07 9 00 00 45 03 6.7 97 13.9 6.2 2.6 9.2 9.3 10.2 10.5 9.8 9.5 10 0 4.4 2.1 000100 1001.5 2.0 0.0 0.7
08 7 25 02 02 95 8.4 95 14.0 2.1 -0.6 7.3 7.7 9.4 10.3 9.8 9.6 10 0 9.9 5.6 000100 1005.0 6.9 0.0 1.1
09 8 22 05 60 95 5.7 96 11.2 5.7 3.4 8.3 8.6 9.7 10.4 9.8 9.6 20 0 3.9 0.3 000100 995.5 1.5 0.0 1.0
10 8 05 13 02 97 5.0 89 8.4 3.7 3.2 7.1 7.2 8.8 9.8 9.5 9.6 10 0 6.7 0.0 000000 995.0 8.6 0.0 0.5
11 8 36 09 02 97 6.0 88 7.9 4.6 4.5 7.6 7.3 8.4 9.1 9.1 9.5 10 0 0.3 0.4 000000 1000.0 1.7 0.0 1.5
12 0 35 09 02 97 5.5 62 10.6 -0.5 -3.7 3.7 4.3 6.7 8.5 8.7 9.5 10 0 0.0 10.7 000000 1009.5 0.0 2.1 2.0
13 2 33 05 02 97 5.8 56 11.6 0.0 -1.9 4.7 5.5 6.7 8.5 8.5 9.3 10 0 1.6 6.5 500000 1010.5 0.9 0.0 1.4
14 8 25 02 85 97 4.8 91 7.5 0.0 -1.6 5.0 5.3 7.4 8.7 8.5 9.1 10 0 8.7 1.3 500000 1004.0 11.9 0.0 0.5
15 8 33 02 61 95 2.2 96 5.0 2.0 1.9 5.6 6.0 7.4 8.4 8.3 9.0 20 0 10.5 0.0 500000 993.5 9.2 0.0 0.3
16 8 09 02 02 97 2.7 90 8.9 0.5 -1.7 3.8 3.9 5.8 7.4 7.8 8.9 10 0 3.3 0.2 000000 995.0 6.0 0.0 0.8
17 7 29 13 02 97 6.5 79 8.2 2.7 3.0 5.6 5.6 6.9 7.7 7.6 8.7 20 0 tr 0.1 000000 996.0 0.0 0.0 1.8
18 7 36 09 02 97 6.6 73 9.4 3.9 1.2 5.6 5.4 6.6 7.4 7.4 8.5 10 0 2.0 1.2 000000 1005.5 2.7 0.0 0.6
19 7 00 00 02 96 8.5 89 13.1 6.0 4.5 7.7 7.2 7.6 7.7 7.5 8.4 10 0 7.4 0.0 000000 1009.0 5.8 0.0 0.8
20 8 23 05 02 96 8.4 94 15.1 5.6 2.1 7.7 7.5 8.4 8.5 8.0 8.4 10 0 0.1 4.3 005000 1009.0 0.3 0.0 1.3
21 8 18 02 60 96 8.6 97 13.7 4.3 1.3 7.3 7.6 8.7 9.0 8.5 8.5 10 0 0.2 0.0 000000 1016.5 1.1 0.0 1.6
22 8 15 02 21 97 13.6 88 22.7 8.6 7.4 9.4 9.1 9.5 9.1 8.6 8.6 10 0 0.5 4.0 000100 1013.0 1.6 0.0 2.1
23 7 13 02 02 96 13.6 87 14.0 10.9 8.8 11.6 11.4 11.7 10.8 9.4 8.8 10 0 0.8 0.4 000000 1010.0 1.7 0.0 0.9
24 7 23 02 02 97 10.8 86 17.2 8.4 5.5 10.0 10.0 10.7 10.6 9.7 9.0 10 0 4.0 0.3 000000 1016.0 3.3 0.0 1.3
25 8 20 05 60 97 11.7 94 17.9 9.8 7.4 10.9 10.7 10.9 10.6 9.9 9.1 20 0 0.3 7.7 000000 1010.0 0.2 0.0 1.8
26 7 36 09 03 97 12.2 84 15.0 5.3 1.6 9.9 9.6 10.7 11.0 10.3 9.4 10 0 5.1 5.5 000100 1005.5 1.5 0.0 1.4
27 9 00 00 45 04 7.2 99 14.5 3.5 1.1 8.4 8.7 10.1 10.9 10.3 9.6 10 0 0.9 2.4 000100 1005.0 0.8 0.0 1.0
28 9 00 00 45 04 9.4 95 15.0 4.8 1.8 9.6 9.7 10.8 11.0 10.3 9.7 10 0 tr 7.1 004000 1006.5 0.0 0.0 1.6
29 3 15 05 02 97 14.2 77 17.2 5.5 1.8 8.1 8.6 10.3 11.0 10.4 9.8 10 0 tr 5.4 000000 1005.0 0.0 0.0 3.0
30 8 07 05 02 97 11.0 81 13.5 9.8 9.1 10.7 10.7 10.4 11.4 10.5 9.9 10 0 0.0 3.6 000000 1014.0 0.0 0.0 2.4
-----------------------------------------------------------------------------------------------------------------
Mean
6.8 4.5 8.4 86 12.9 5.3 3.0 8.0 8.1 9.2 9.7 9.2 9.2 1003.9
Total 106.0 86.1 84.6 2.1 41.0
1961-1990 Climatological
Mean5.1 6.1 77 13.5 4.8 2.0 7.2 7.7 8.2 8.7 8.3 8.0 45.9 140.9 1015.2 45
-----------------------------------------------------------------------------------------------------------------
Snow days 3; mean 1.0; 50% snow cover at 09h days 0; mean 0.1;
Hail days 1; mean 0.3; Ice pellets days 3; mean 0.3;
Thunder days 7; mean 0.6; Fog at 09h days 0; mean 0.1;
Gale days 0; mean 0.0;
Air frost days 1; mean 2.1; Days with 0.2mm rain days 24; mean 14.1*
Grass minimum frost days 5; mean 9.2; Days with 1.0mm rain days 18; mean 10.1*
Soil frost days 1 Days with 5.0mm rain days 9; mean 3.4*
Concrete frost days 1 Days with no sun days 4; mean 3.4
Minimum relative humidity - 30%/13th; Air pressure: max - 1019.5mb/30th min - 982.0mb/4th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (02 sky not changing, 03 cloud increasing, 21 recent rain, 25 recent rain shower,
45 fog, 60 light rain, 61 continuous light rain, 85 light snow shower);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 40 frozen, 50 glaze;
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
Wettest April in Maidenhead since at least 1859.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR MAY 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 8 04 09 02 97 8.4 85 10.8 8.1 7.6 9.4 9.8 10.9 11.1 10.5 10.0 10 0 0.1 0.0 000000 1020.0 0.0 0.0 1.4
02 7 03 09 02 97 10.2 79 16.8 8.0 7.5 9.4 9.3 10.1 10.5 10.2 10.0 10 0 1.0 10.5 000000 1019.0 2.0 0.0 2.6
03 7 35 09 02 97 9.3 72 12.4 7.5 3.5 8.5 9.0 10.5 11.1 10.3 10.0 10 0 0.0 6.0 000000 1021.5 0.0 0.0 1.9
04 3 31 05 02 97 11.5 76 17.8 1.1 -0.8 8.8 9.0 9.3 10.7 10.3 10.0 10 0 0.0 7.5 000000 1021.0 0.0 0.0 1.9
05 7 27 02 02 97 10.4 91 15.4 8.1 4.5 10.1 10.3 11.5 11.4 10.4 10.0 00 0 0.1 0.2 000000 1014.5 0.1 0.0 1.7
06 8 27 05 60 97 12.6 85 17.9 10.4 9.0 11.2 11.1 11.5 11.3 10.5 10.1 00 0 0.1 1.7 000000 1005.5 0.3 0.0 2.2
07 8 24 09 02 97 13.9 71 16.8 11.6 10.6 12.1 12.1 12.5 11.9 10.9 10.1 00 0 0.0 1.1 000000 1012.5 0.0 0.0 1.7
08 6 17 02 02 97 15.8 77 24.1 7.7 4.4 11.1 11.1 11.8 11.7 11.0 10.3 90 0 tr 6.6 000000 1019.0 0.0 0.0 2.5
09 4 14 02 02 97 20.0 62 22.7 11.0 7.8 13.0 12.9 13.7 13.0 11.7 10.4 90 0 0.4 11.9 000000 1017.5 0.6 0.0 2.6
10 7 23 05 02 97 15.3 71 23.0 10.3 7.5 14.2 14.1 14.7 14.0 12.5 10.7 90 0 0.0 7.4 000000 1021.5 0.0 0.0 2.7
11 8 05 05 02 97 13.2 81 22.2 10.7 10.2 14.1 14.2 15.1 14.4 12.9 11.1 90 0 0.0 8.8 000000 1017.0 0.0 0.0 2.1
12 8 05 09 02 96 12.3 89 22.9 10.8 10.8 14.4 14.7 15.7 14.9 13.3 11.4 90 0 0.0 8.0 000000 1019.5 0.0 0.0 1.7
13 8 03 09 02 96 17.8 82 25.0 11.7 11.7 15.2 15.5 16.1 15.2 13.6 11.7 90 0 8.6 8.5 000000 1021.5 5.0 0.0 2.0
14 8 01 02 95 94 17.7 98 22.7 17.3 14.7 17.5 17.5 17.7 16.1 14.2 12.0 10 0 6.0 0.1 000100 1021.0 3.0 0.0 1.2
15 0 07 02 02 97 18.7 68 25.9 11.5 9.6 14.5 15.0 16.1 15.8 14.4 12.2 10 0 0.0 13.2 000000 1022.0 0.0 0.0 3.6
16 4 36 02 02 97 17.0 67 25.1 9.2 6.4 13.9 14.4 16.1 16.2 14.8 12.5 10 0 0.0 13.0 000000 1023.0 0.0 0.0 3.6
17 3 03 02 02 97 17.8 57 22.4 9.7 7.0 13.7 14.4 16.1 16.4 15.1 12.9 00 0 0.0 14.5 000000 1025.5 0.0 0.0 4.0
18 1 33 02 02 97 15.8 51 24.4 8.5 4.9 13.2 14.1 16.0 16.3 15.2 13.0 90 0 0.0 10.5 000000 1028.0 0.0 0.0 4.3
19 1 07 02 02 97 16.8 49 24.1 9.2 6.3 14.4 15.0 16.9 16.6 15.3 13.2 90 0 0.0 14.1 000000 1029.0 0.0 0.0 3.5
20 6 02 02 02 96 18.6 70 25.3 9.9 7.4 15.6 16.0 17.4 16.9 15.6 13.4 90 0 0.0 9.9 000000 1025.5 0.0 0.0 3.5
21 7 34 02 02 97 15.9 71 18.3 13.7 10.7 16.7 17.2 18.3 17.5 16.0 13.6 90 0 0.0 3.2 000000 1022.5 0.0 0.0 2.6
22 7 33 05 02 97 12.2 61 18.5 8.2 5.0 14.4 14.9 16.4 16.5 15.7 13.9 90 0 0.0 3.7 000000 1028.0 0.0 0.0 2.3
23 7 32 05 02 97 12.9 69 17.1 9.1 6.1 14.2 14.7 16.2 16.2 15.4 13.9 90 0 0.0 1.2 000000 1024.0 0.0 0.0 1.7
24 8 31 05 02 97 14.4 78 18.2 12.1 9.1 16.2 15.7 16.0 15.6 15.1 13.9 90 0 0.0 1.8 000000 1018.5 0.0 0.0 1.5
25 7 30 02 02 97 14.9 69 20.8 10.8 7.9 15.1 14.9 15.7 15.5 14.9 13.8 90 0 5.2 3.3 000000 1012.5 0.3 0.0 1.4
26 7 00 00 02 96 12.3 89 17.6 11.7 9.9 14.5 14.9 15.9 15.7 14.9 13.8 10 0 17.4 1.1 000000 1006.0 8.5 0.0 1.0
27 8 04 05 60 97 8.7 94 13.0 7.4 7.2 12.2 12.8 14.2 15.0 14.7 13.9 10 0 1.6 0.0 000000 1008.0 1.5 0.0 0.9
28 7 06 05 02 97 13.0 80 17.1 8.7 8.1 12.1 13.4 13.7 14.1 14.1 13.7 10 0 0.3 4.9 000000 1009.5 0.3 0.0 1.6
29 6 16 05 02 97 14.9 73 20.0 11.1 8.6 14.2 14.0 14.5 14.5 14.0 13.5 10 0 0.0 10.0 000000 1011.0 0.0 0.0 3.8
30 6 36 05 02 97 18.9 54 23.5 6.7 3.9 11.1 11.7 14.7 15.0 14.2 13.5 00 0 3.8 14.0 000000 1015.5 1.1 0.0 3.2
31 7 04 05 02 97 14.9 80 20.6 12.7 11.3 15.6 15.4 15.9 15.6 14.7 13.5 10 0 0.0 7.6 000000 1010.5 0.0 0.0 2.5
-----------------------------------------------------------------------------------------------------------------
Mean
6.1 4.5 14.4 74 20.1 9.8 7.7 13.2 13.5 14.6 14.4 13.4 12.1 1018.4
Total 44.6 204.3 22.7 0.0 73.2
1961-1990 Climatological
Mean4.9 6.4 73 17.1 7.9 5.6 10.7 10.7 12.1 12.2 11.2 10.1 54.1 187.3 1015.2 46
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.1; 50% snow cover at 09h days 0; mean 0.0;
Hail days 0; mean 0.3; Ice pellets days 0; mean 0.1;
Thunder days 1; mean 1.8; Fog at 09h days 0; mean 0.1;
Gale days 0; mean 0.0;
Air frost days 0; mean 0.2; Days with 0.2mm rain days 9; mean 13.7*
Grass minimum frost days 1; mean 2.0; Days with 1.0mm rain days 7; mean 10.3*
Soil frost days 0 Days with 5.0mm rain days 4; mean 3.6*
Concrete frost days 0 Days with no sun days 2; mean 2.3
Minimum relative humidity - 38%/19th; Air pressure: max - 1029.0mb/19th min - 1005.0mb/6th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing,
10 mist, 21 recent rain, 60 intermittent light drizzle, 95 light thunderstorm);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 90 cracked);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR JUNE 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 0 15 02 02 97 19.2 70 21.8 11.4 5.5 12.8 13.5 15.5 15.7 14.9 13.6 10 0 13.3 6.6 000000 1013.0 8.0 0.0 2.6
02 8 18 09 21 95 14.2 95 18.2 13.0 12.5 15.0 15.4 16.1 15.8 14.9 13.7 20 0 3.0 4.9 000000 1004.0 1.8 0.0 1.6
03 7 24 05 21 97 15.8 85 18.3 10.8 7.7 13.8 13.8 14.8 15.2 14.7 13.8 10 0 2.5 4.9 000100 1010.0 2.0 0.0 1.4
04 8 36 05 02 97 11.8 86 16.8 11.1 9.2 14.2 14.5 15.5 15.5 14.6 13.8 10 0 0.0 1.9 000000 1021.5 0.0 0.0 1.5
05 8 02 05 02 97 15.6 79 19.5 9.2 7.0 13.1 13.3 14.4 15.0 14.4 13.8 10 0 tr 4.2 000000 1018.0 0.0 0.0 1.9
06 8 06 05 02 96 16.5 88 22.4 14.1 13.1 16.1 16.8 16.0 15.4 14.5 13.8 10 0 1.0 5.2 000000 1010.5 1.4 0.0 2.0
07 7 18 09 02 97 15.7 79 20.9 10.2 8.7 15.5 15.5 16.1 15.9 14.8 13.8 10 0 2.7 8.4 000000 1008.5 1.0 0.0 2.2
08 8 24 05 03 97 15.7 72 16.7 11.0 9.6 14.8 14.8 15.9 16.0 15.2 13.9 10 0 3.5 2.4 000000 1015.5 6.3 0.0 1.2
09 8 24 13 50 96 16.7 90 20.4 14.6 14.5 15.6 15.6 16.0 15.5 14.9 14.0 10 0 1.5 6.0 000000 1006.0 0.7 0.0 2.4
10 8 24 05 21 97 14.1 81 18.8 11.4 9.6 14.3 14.9 15.9 15.9 15.2 14.0 10 0 5.7 4.3 000000 1002.0 3.2 0.0 1.3
11 8 35 05 60 97 11.0 91 13.0 9.7 9.4 14.4 15.0 16.1 16.3 15.3 14.1 10 0 1.7 0.1 000000 1006.5 2.0 0.0 0.9
12 0 33 02 02 97 13.0 68 18.0 5.8 4.2 11.1 11.2 13.4 14.5 14.7 14.1 10 0 0.1 10.7 000000 1021.0 0.1 0.0 1.9
13 8 22 05 60 97 12.8 79 15.1 10.1 8.4 13.9 14.1 15.1 15.2 14.5 14.1 10 0 17.2 0.0 000100 1012.5 5.5 0.0 0.6
14 6 22 02 02 97 15.1 83 18.6 11.2 8.5 14.1 14.0 14.5 14.5 14.4 14.1 10 0 6.7 2.5 000000 1006.5 1.5 0.0 0.8
15 8 32 05 02 97 13.8 90 17.9 11.2 10.0 14.9 14.7 15.1 15.1 14.5 14.0 10 0 0.0 0.5 000000 1011.5 0.0 0.0 1.4
16 8 30 02 02 97 14.5 81 18.8 12.5 11.8 14.3 14.5 15.2 15.1 14.5 14.0 10 0 0.3 4.0 000000 1019.0 0.2 0.0 1.3
17 7 31 02 02 97 15.1 74 18.4 9.0 6.4 13.1 13.3 14.4 14.9 14.6 14.0 10 0 3.8 1.2 000000 1025.5 4.1 0.0 1.1
18 8 23 09 02 97 15.2 93 18.4 12.1 11.9 14.9 15.0 15.5 15.3 14.6 14.0 10 0 0.2 0.0 000000 1023.0 0.7 0.0 0.8
19 8 21 02 02 97 18.4 85 25.4 14.7 14.0 16.4 15.9 16.0 15.5 14.7 14.0 10 0 0.0 6.3 000000 1023.5 0.0 0.0 2.4
20 6 18 02 02 97 22.0 84 28.1 14.4 12.6 16.9 16.9 17.5 17.0 15.5 14.1 10 0 tr 7.2 000000 1020.0 0.0 0.0 3.2
21 7 27 09 02 97 21.3 68 25.6 16.2 13.5 18.3 17.9 18.1 17.5 16.2 14.3 00 0 tr 9.2 000000 1016.0 0.0 0.0 2.9
22 1 25 02 02 97 18.2 83 21.5 10.7 8.7 15.4 16.2 17.9 18.3 16.8 14.6 00 0 1.4 10.8 000000 1022.5 1.9 0.0 2.3
23 8 22 09 61 96 14.6 92 20.8 13.3 12.0 16.4 16.9 17.8 17.7 16.8 14.9 10 0 0.6 0.5 000000 1019.5 1.9 0.0 0.9
24 1 19 05 02 97 20.3 71 22.9 14.4 12.2 18.6 16.8 17.7 17.5 16.6 15.1 10 0 9.7 8.9 000000 1013.5 6.8 0.0 2.0
25 8 25 09 02 97 15.8 88 20.0 13.7 12.3 18.4 17.3 18.0 17.9 16.9 15.1 10 0 1.5 3.7 000000 1011.0 0.8 0.0 1.4
26 8 20 05 03 97 14.5 85 17.0 11.7 9.7 17.5 16.2 17.1 17.5 16.7 15.3 10 0 7.3 0.0 000000 1012.0 8.1 0.0 1.3
27 7 23 09 02 97 17.0 73 20.1 13.0 12.8 16.7 16.2 16.5 16.8 16.2 15.3 10 0 5.8 7.2 000100 1006.5 1.4 0.0 1.5
28 5 27 05 02 97 17.9 71 22.4 10.0 7.7 15.4 15.4 16.3 17.0 16.4 15.3 10 0 0.0 9.5 000000 1010.0 0.0 0.0 2.7
29 7 23 05 02 97 17.2 76 19.4 10.7 8.5 15.6 15.7 16.9 17.3 16.5 15.3 10 0 9.3 1.1 000000 1018.5 6.5 0.0 1.4
30 8 30 02 02 97 17.2 78 20.4 13.8 10.4 16.4 16.6 17.1 17.1 16.4 15.4 10 0 0.0 5.8 000000 1013.0 0.0 0.0 2.0
-----------------------------------------------------------------------------------------------------------------
Mean
6.6 5.3 16.0 81 19.9 11.8 10.1 15.3 15.3 16.1 16.1 15.4 14.3 1014.0
Total
98.8 138.0 65.9 0.0 50.9
Climatological
Mean5.3 5.6 72 20.0 10.7 9.0 14.3 14.5 15.6 15.2 14.1 12.5 52.6 191.8 1017.0 41
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.0; 50% snow cover at 09h days 0; mean 0.0;
Hail days 0; mean 0.1; Ice pellets days 0; mean 0.0;
Thunder days 3; mean 2.3; Fog at 09h days 0; mean 0.1;
Gale days 0; mean 0.0;
Air frost days 0; mean 0.0; Days with 0.2mm rain days 21; mean 11.5*
Grass minimum frost days 0; mean 0.0; Days with 1.0mm rain days 18; mean 8.2*
Soil frost days 0 Days with 5.0mm rain days 8; mean 3.6*
Concrete frost days 0 Days with no sun days 3; mean 2.1
Minimum relative humidity - 48%/1st,12th; Air pressure: max - 1025.5mb/17th min - 1001.5mb/10th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (02 sky not changing, 03 cloud increasing, 21 recent rain,
50 intermittent light drizzle, 60 intermittent light rain, 61 continuous light rain)
09GMT observations...
Temp temperature (degC); RH relative humidity (%);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 90 cracked);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
Notes: Most wet days in June since before 1953. Rainfall ranked as about a 1 in 10 year event for June.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR JULY 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 4 36 02 02 97 15.9 71 20.3 13.2 10.1 15.6 16.2 17.4 17.4 16.5 15.4 10 0 0.0 6.4 000000 1016.5 0.0 0.0 2.5
02 8 02 05 03 97 14.8 75 17.0 11.1 9.5 15.1 15.5 16.7 16.9 16.4 15.4 10 0 0.0 0.0 000000 1020.0 0.0 0.0 1.7
03 7 33 05 02 97 14.6 75 19.2 9.5 7.6 14.4 14.6 15.7 16.2 16.1 15.4 10 0 0.0 2.0 000000 1023.0 0.0 0.0 1.5
04 8 32 02 02 97 15.5 80 20.1 10.7 9.0 15.0 15.0 15.9 16.1 15.8 15.3 10 0 0.0 0.1 000000 1025.0 0.0 0.0 1.2
05 0 27 02 02 09 20.1 69 23.6 11.7 10.5 14.9 15.1 16.1 16.2 15.7 15.1 10 0 0.1 8.8 000000 1019.5 0.1 0.0 1.8
06 8 00 00 52 94 16.6 95 19.1 16.4 15.7 17.7 17.8 18.1 17.5 16.2 15.2 10 0 1.0 0.0 000000 1014.5 1.8 0.0 0.8
07 8 34 02 02 97 15.2 76 20.7 12.5 12.0 15.6 16.1 16.9 17.0 16.4 15.3 10 0 0.0 2.0 000000 1015.5 0.0 0.0 2.1
08 7 29 02 02 97 14.1 73 23.4 8.9 6.9 14.3 14.8 16.4 16.8 16.3 15.4 00 0 0.1 5.6 000000 1017.5 0.2 0.0 2.3
09 8 21 05 02 97 16.8 85 21.1 14.1 13.8 16.9 17.2 17.8 17.3 16.5 15.4 10 0 0.0 0.5 000000 1012.5 0.0 0.0 1.4
10 8 23 02 02 97 18.4 73 21.0 15.0 13.9 16.9 17.3 17.8 17.4 16.5 15.5 00 0 tr 2.2 000000 1013.5 0.0 0.0 2.0
11 7 20 05 02 97 18.4 63 18.6 14.3 13.0 16.4 16.6 17.5 17.4 16.7 15.5 00 0 11.5 1.5 000000 1012.5 10.2 0.0 1.0
12 8 22 09 61 95 16.9 94 18.5 14.9 14.5 17.8 17.8 17.8 17.2 16.7 15.6 10 0 3.1 0.2 000000 1005.0 1.4 0.0 1.2
13 1 29 09 02 97 15.7 66 20.1 10.4 7.7 14.4 14.9 16.4 16.9 16.4 15.6 10 0 0.4 11.0 000100 1007.0 0.1 0.0 2.4
14 1 33 05 02 97 17.0 65 20.2 11.0 8.2 14.1 14.9 16.4 17.0 16.6 15.6 10 0 tr 7.0 000000 1013.0 0.0 0.0 2.2
15 7 25 02 02 97 16.5 72 19.3 11.4 8.9 15.6 15.6 16.5 16.9 16.5 15.6 10 0 2.0 2.4 000000 1013.0 3.7 0.0 2.0
16 7 25 02 21 97 16.0 91 23.6 13.4 12.8 16.2 16.3 17.0 16.9 16.3 15.6 10 0 0.1 4.8 000000 1011.0 0.2 0.0 1.6
17 8 28 09 02 97 16.8 88 22.8 13.9 10.7 16.8 17.2 17.8 17.6 16.7 15.6 10 0 0.0 7.0 000000 1008.0 0.0 0.0 2.4
18 4 27 09 03 97 17.1 65 21.5 12.3 10.1 15.6 15.9 16.8 17.2 16.7 15.7 10 0 0.0 10.2 000000 1011.5 0.0 0.0 2.7
19 7 29 02 02 97 18.9 68 23.2 10.5 7.9 15.8 16.0 16.7 17.0 16.6 15.8 00 0 0.0 6.2 000000 1014.0 0.0 0.0 2.5
20 6 22 02 02 97 21.0 73 26.2 12.3 10.1 16.1 16.5 17.8 17.6 16.8 15.8 00 0 tr 9.7 000000 1008.5 0.0 0.0 3.3
21 7 22 05 02 97 18.9 72 21.5 15.6 14.0 18.3 18.6 19.3 18.6 17.4 15.9 00 0 0.0 6.4 000000 1007.0 0.0 0.0 3.0
22 1 22 09 02 97 17.0 73 22.4 12.2 9.2 15.8 16.5 18.1 18.1 17.5 16.0 00 0 3.1 8.9 000000 1015.5 2.5 0.0 2.3
23 7 20 09 02 97 17.7 87 22.9 14.5 12.4 17.8 17.9 18.5 18.1 17.5 16.1 10 0 0.0 7.3 000000 1010.5 0.0 0.0 2.1
24 5 32 02 03 97 18.5 68 23.0 10.1 6.8 13.9 14.9 16.8 17.7 17.4 16.1 10 0 0.0 11.5 000000 1023.0 0.0 0.0 3.0
25 6 09 02 02 97 18.2 68 23.2 10.1 6.5 14.0 15.0 17.4 17.9 17.4 16.1 00 0 0.0 8.0 000000 1025.0 0.0 0.0 2.5
26 7 22 05 02 97 15.2 83 20.7 9.9 7.5 16.0 16.5 17.6 18.0 17.5 16.2 00 0 3.0 3.5 000000 1017.0 4.2 0.0 2.3
27 8 23 02 02 96 14.4 94 23.8 13.1 12.0 16.3 16.8 17.9 17.9 17.5 16.3 10 0 0.0 5.7 000000 1012.0 0.0 0.0 1.8
28 8 22 05 02 97 16.2 81 21.3 13.4 10.9 16.5 16.7 17.6 17.9 17.5 16.4 10 0 1.7 1.0 000000 1011.0 3.1 0.0 1.6
29 8 25 09 21 97 15.8 94 21.1 15.0 14.5 17.2 17.5 18.2 18.0 17.4 16.3 10 0 1.1 0.1 000000 1008.0 0.9 0.0 1.3
30 6 27 05 01 97 17.0 74 21.5 12.4 9.1 14.9 15.6 16.9 17.5 17.3 16.4 10 0 2.3 6.3 000000 1006.5 1.1 0.0 2.2
31 6 29 02 02 97 18.2 75 23.0 12.8 9.9 15.4 15.9 17.2 17.6 17.2 16.3 10 0 0.1 2.9 000000 1013.5 0.2 0.0 1.9
-----------------------------------------------------------------------------------------------------------------
Mean
6.2 4.4 16.9 77 21.4 12.5 10.5 15.8 16.2 17.3 17.3 16.8 15.7 1013.9
Total 29.6 149.2 29.7 0.0 62.6
1961-1990 Climatological
Mean5.2 5.5 73 22.1 12.5 10.8 16.0 16.4 17.3 17.3 16.3 15.1 46.7 191.2 1017.5 35
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.0; 50% snow cover at 09h days 0; mean 0.0;
Hail days 0; mean 0.1; Ice pellets days 0; mean 0.0;
Thunder days 1; mean 1.9; Fog at 09h days 0; mean 0.1;
Gale days 0; mean 0.0;
Air frost days 0; mean 0.0 Days with 0.2mm rain days 10; mean 10.9*
Grass minimum frost days 0; mean 0.0 Days with 1.0mm rain days 9; mean 7.6*
Soil frost days 0 Days with 5.0mm rain days 1; mean 2.8*
Concrete frost days 0 Days with no sun days 2; mean 1.7
Minimum relative humidity - 40%/25th; Air pressure: max - 1025.0mb/4th, 25th, min - 1000.0mb/12th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 21 recent rain,
52 intermittent moderate rain, 61 continuous light rain);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (0 dry, 1 moist, 2 wet);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard;
G gale; F fog at 09GMT;
* Averages for Hurley (4km away)
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR AUGUST 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 6 34 02 02 97 18.9 76 23.0 12.0 9.1 16.0 16.3 17.1 17.6 17.3 16.3 10 0 4.2 4.6 000100 1017.5 1.5 0.0 1.6
02 7 03 09 02 97 14.7 72 20.8 14.7 9.3 15.6 15.6 16.7 17.4 17.1 16.3 10 0 0.5 6.5 000000 1024.5 1.6 0.0 1.9
03 7 29 02 60 96 15.4 89 17.3 10.0 7.0 14.9 15.3 16.5 17.1 17.0 16.3 00 0 1.4 0.1 000000 1021.0 2.7 0.0 1.0
04 0 30 05 02 97 17.2 62 22.9 12.4 8.3 14.9 15.6 16.9 17.0 16.7 16.2 10 0 0.0 14.0 000000 1025.5 0.0 0.0 2.6
05 4 19 02 02 97 19.5 74 25.5 10.9 7.0 14.6 15.5 17.0 17.5 17.0 16.1 00 0 0.0 14.4 000000 1030.0 0.0 0.0 3.4
06 0 24 05 02 97 17.5 75 26.4 10.3 7.3 14.8 15.6 17.1 17.9 17.4 16.2 00 0 0.0 13.5 000000 1026.5 0.0 0.0 2.8
07 1 33 02 02 97 17.7 87 28.2 12.0 8.4 15.9 16.6 18.0 18.4 17.7 16.3 00 0 0.0 14.2 000000 1023.5 0.0 0.0 2.6
08 0 33 02 02 97 20.9 70 29.6 11.6 8.2 16.1 16.8 18.4 18.6 18.0 16.5 90 0 0.0 13.8 000000 1019.5 0.0 0.0 4.1
09 8 05 09 02 97 19.0 76 25.5 15.7 12.8 17.8 18.2 19.0 19.0 18.3 16.6 90 0 0.0 9.0 000000 1020.5 0.0 0.0 3.2
10 2 05 02 02 97 22.4 63 29.8 14.1 12.5 18.2 18.5 19.1 19.1 18.3 16.9 90 0 0.0 11.5 000000 1016.0 0.0 0.0 2.3
11 2 31 02 02 96 22.1 63 29.7 13.5 11.5 18.5 19.0 19.7 19.4 18.5 16.9 90 0 0.0 13.0 000000 1018.0 0.0 0.0 3.4
12 3 27 05 02 97 20.3 58 23.2 12.9 7.5 18.6 19.2 19.8 19.4 18.6 17.0 90 0 0.0 11.5 000000 1017.0 0.0 0.0 3.4
13 5 27 05 02 97 18.1 58 22.0 11.2 8.5 16.1 17.0 18.0 18.7 18.4 17.1 90 0 0.0 4.0 000000 1019.0 0.0 0.0 2.7
14 7 22 05 02 97 19.2 68 26.0 14.1 12.0 16.2 17.0 18.5 18.4 18.1 16.9 90 0 8.5 7.5 000000 1015.0 3.2 0.0 2.7
15 8 36 09 63 96 16.5 77 22.5 13.0 12.5 16.0 16.5 18.8 17.7 18.2 16.9 10 0 0.0 10.5 000000 1016.5 0.0 0.0 1.9
16 7 27 02 02 97 19.0 70 24.0 9.8 6.8 14.5 15.0 17.0 18.0 18.1 17.0 10 0 0.0 9.5 000000 1022.5 0.0 0.0 2.6
17 7 19 05 02 97 18.2 76 25.0 13.8 10.0 16.6 17.0 18.3 18.5 18.2 17.2 90 0 0.0 5.0 000000 1018.0 0.0 0.0 2.4
18 7 31 05 02 97 16.6 69 22.5 14.4 12.2 17.7 18.0 19.0 18.9 18.2 17.1 90 0 0.0 6.9 000000 1020.5 0.0 0.0 2.9
19 0 36 02 02 97 18.8 70 24.4 9.3 7.0 15.0 15.8 17.6 18.2 18.2 17.1 90 0 0.0 13.1 000000 1022.5 0.0 0.0 3.0
20 3 18 05 02 97 18.2 68 21.0 11.3 8.9 15.6 16.2 17.8 18.2 18.1 17.1 90 0 0.4 3.0 000000 1017.0 1.4 0.0 2.1
21 8 27 13 58 97 19.8 67 22.8 15.0 13.0 15.4 15.8 17.7 17.9 17.9 17.1 90 0 0.0 7.5 000000 1005.0 0.0 0.0 2.0
22 7 27 05 02 97 14.7 72 20.7 10.7 8.0 15.0 15.1 16.6 17.5 17.7 17.0 90 0 1.0 6.0 000000 1011.5 1.5 0.0 2.4
23 7 24 02 60 97 12.5 89 18.8 8.5 5.7 14.6 15.0 16.3 17.1 17.3 16.9 10 0 6.3 0.0 000000 1016.5 5.2 0.0 1.8
24 7 17 05 02 97 14.3 91 17.9 12.0 9.5 14.3 14.7 16.1 16.7 16.9 16.9 10 0 0.7 4.3 000000 1013.0 0.2 0.0 1.4
25 6 25 02 03 97 13.2 77 22.0 7.5 5.6 12.1 12.9 15.2 16.2 16.7 16.7 10 0 0.1 8.4 000000 1021.0 0.2 0.0 2.2
26 7 22 02 21 97 17.6 92 17.9 13.2 15.2 17.1 17.1 17.7 17.2 16.8 16.5 10 0 tr 0.1 000000 1015.0 0.0 0.0 1.2
27 7 31 02 02 97 14.4 76 20.4 7.6 5.4 13.2 13.7 16.5 16.3 16.7 16.5 10 0 0.0 11.0 000000 1025.0 0.0 0.0 2.7
28 0 22 02 02 97 16.1 68 19.7 8.0 5.1 12.2 13.3 15.3 16.2 16.4 16.4 00 0 0.0 7.9 000000 1025.5 0.0 0.0 2.1
29 6 34 05 03 97 17.4 70 22.0 8.4 5.8 12.8 13.6 15.5 16.0 16.3 16.3 00 0 0.0 10.2 000000 1023.5 0.0 0.0 1.8
30 8 18 02 02 96 15.3 86 22.1 11.0 8.6 14.9 15.1 16.0 16.3 16.4 16.1 90 0 0.0 4.6 000000 1021.5 0.0 0.0 2.0
31 6 15 02 02 97 17.6 69 21.5 11.9 9.1 14.9 15.4 16.7 16.9 16.6 16.1 90 0 0.7 6.6 000000 1017.5 2.2 0.0 2.6
-----------------------------------------------------------------------------------------------------------------
Mean
4.9 4.1 17.5 73 23.1 11.6 9.0 15.5 16.0 17.4 17.7 17.5 16.7 1019.5
Mean
Total 23.8 252.2 19.7 0.0 74.8
1961-1990 Climatological
Mean5.2 5.3 77 21.7 12.2 10.5 15.6 16.2 17.2 17.2 17.0 16.1 57.5 180.9 1016.4 39
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.0; 50% snow cover at 09h days 0; mean 0.0;
Hail days 0; mean 0.0; Ice pellets days 0; mean 0.1;
Thunder days 1; mean 1.5; Fog at 09h days 0; mean 0.4;
Gale days 0; mean 0.0;
Air frost days 0; mean 0.0 Days with 0.2mm rain days 9; mean 12.4*
Grass minimum frost days 0; mean 0.0 Days with 1.0mm rain days 5; mean 8.6*
Soil frost days 0 Days with 5.0mm rain days 2; mean 3.4*
Concrete frost days 0 Days with no sun days 1; mean 2.2
Minimum relative humidity - 33%/8th; Air pressure: max - 1030.0mb/5th, min - 1003.0mb/21st
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (02 sky not changing, 03 cloud increasing, 21 recent rain,
58 light rain and drizzle, 60 intermittent light rain, 63 continuous moderate rain);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet, 90 cracked);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling; F fog at 09GMT;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard; G gale;
* Averages for Hurley (4km away)
Return to top of document
MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR SEPTEMBER 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 8 30 02 21 97 18.9 76 24.8 15.6 14.1 16.4 16.7 17.4 17.1 16.8 16.1 10 0 0.0 6.9 000000 1010.5 0.0 0.0 2.3
02 7 18 02 02 97 17.8 86 22.5 12.3 9.9 15.6 16.3 17.6 17.5 17.1 16.1 00 0 15.9 2.4 000000 1014.0 10.0 0.0 1.2
03 8 32 02 61 94 15.9 93 21.7 14.8 14.2 16.2 16.7 17.5 17.5 17.2 16.3 20 0 tr 2.7 000000 1012.5 0.0 0.0 1.0
04 8 00 00 46 04 14.6 97 20.1 11.2 9.0 14.6 15.2 16.5 17.0 17.0 16.4 10 0 19.6 0.1 000000 1009.5 12.0 0.0 1.0
05 8 22 02 63 94 15.5 96 19.4 14.6 14.4 16.1 16.1 16.9 16.9 16.8 16.4 20 0 6.6 0.8 000000 1002.0 1.8 0.0 0.4
06 3 18 02 02 97 16.1 89 21.0 12.7 10.1 14.9 15.4 16.4 16.9 16.7 16.3 10 0 0.7 2.2 000000 1009.5 1.2 0.0 1.3
07 6 19 02 01 96 19.1 89 22.1 14.7 11.3 15.8 16.4 17.1 17.0 16.6 16.2 10 0 1.2 7.6 000000 1002.5 1.9 0.0 2.2
08 8 19 02 21 96 16.3 92 22.0 15.7 14.2 16.6 16.9 17.5 17.4 16.8 16.2 10 0 10.2 3.4 000000 1000.5 1.7 0.0 1.7
09 8 23 09 02 97 18.0 81 21.1 16.0 13.9 16.7 16.9 17.4 17.3 16.9 16.3 10 0 3.0 6.4 000000 995.5 2.9 0.0 1.9
10 8 19 05 61 96 16.0 90 19.6 14.9 12.6 16.0 16.2 17.0 17.2 16.9 16.3 10 0 0.4 6.3 000000 999.0 2.1 0.0 2.2
11 7 31 02 02 97 12.3 81 18.6 10.3 8.5 13.7 14.4 15.9 16.8 16.8 16.4 10 0 1.7 7.1 000000 1002.5 0.6 0.0 1.4
12 3 26 13 02 97 10.1 91 15.0 6.5 3.6 11.7 12.7 14.8 16.1 16.3 16.3 10 0 7.7 4.5 005100 999.5 8.4 0.0 1.0
13 4 36 13 02 97 11.1 81 15.3 6.8 3.9 11.1 11.7 13.5 15.1 15.7 16.1 10 0 0.0 7.6 000000 1000.0 0.0 0.0 2.1
14 1 32 05 02 97 13.1 81 17.4 8.0 5.0 10.6 11.5 13.0 14.5 15.1 15.9 10 0 0.9 7.1 000000 1004.0 1.9 0.0 2.0
15 8 24 05 60 96 11.0 91 17.5 7.5 4.4 11.7 12.1 13.5 14.5 14.8 15.6 10 0 2.5 1.6 000000 1007.0 3.0 0.0 0.7
16 7 18 02 02 97 13.4 79 17.7 8.9 5.7 11.6 12.3 13.9 14.6 14.7 15.4 10 0 0.0 5.6 000000 1011.0 0.0 0.0 2.2
17 7 27 02 02 97 14.5 78 18.2 8.4 5.1 10.7 11.6 13.4 14.5 14.6 15.3 10 0 0.5 7.6 000000 1017.0 0.9 0.0 1.2
18 8 00 00 02 96 16.0 94 20.1 10.7 7.2 13.8 13.7 14.5 14.6 14.6 15.1 10 0 0.0 0.5 000000 1022.5 0.0 0.0 0.9
19 7 13 02 02 97 17.4 83 23.0 15.0 13.5 15.6 15.5 15.8 15.2 15.0 15.1 10 0 0.0 5.2 000000 1029.5 0.0 0.0 1.4
20 0 00 00 28 10 16.6 89 21.5 11.2 9.0 14.0 14.4 15.4 15.7 15.3 15.1 10 0 0.0 8.4 000000 1033.5 0.0 0.0 1.7
21 8 09 02 02 97 16.2 87 20.8 13.3 9.3 15.0 15.1 15.6 15.9 15.4 15.2 10 0 0.0 4.5 000000 1033.5 0.0 0.0 1.9
22 8 13 09 02 96 15.3 87 17.9 13.2 10.5 14.6 14.8 15.4 15.6 15.4 15.3 10 0 0.0 0.3 000000 1028.0 0.0 0.0 1.3
23 0 09 02 02 96 15.8 86 21.1 11.7 8.8 12.8 13.5 14.9 15.4 15.4 15.3 10 0 0.0 7.5 000000 1022.0 0.0 0.0 2.0
24 8 09 09 10 94 15.1 90 21.6 12.7 9.6 14.1 14.3 14.8 15.2 15.4 15.3 10 0 0.0 6.8 000000 1017.0 0.0 0.0 1.7
25 8 09 05 05 95 15.4 97 22.5 12.1 10.0 14.2 14.3 15.1 15.6 15.4 15.3 10 0 0.2 5.5 000000 1010.5 1.0 0.0 1.5
26 7 11 05 02 97 16.5 89 21.0 14.2 11.3 15.0 15.2 15.9 15.9 15.5 15.3 10 0 22.8 0.1 000000 1002.0 13.4 0.0 0.7
27 8 00 00 02 96 15.4 96 18.8 13.8 13.2 15.6 15.6 16.0 16.0 15.6 15.3 20 0 7.0 0.6 000000 998.0 4.9 0.0 0.3
28 8 33 05 02 94 15.5 90 17.6 14.7 13.2 15.7 16.0 16.4 16.3 15.7 15.4 10 0 0.5 0.0 000000 1005.0 1.3 0.0 0.7
29 8 34 02 05 96 14.2 92 16.5 11.0 10.8 15.1 15.0 15.8 16.0 15.6 15.4 10 0 4.6 0.2 000000 1007.0 5.0 0.0 0.9
30 8 11 09 02 96 15.0 93 18.1 13.7 12.0 14.6 14.9 15.4 15.8 15.6 15.5 10 0 9.8 4.4 000000 995.5 5.9 0.0 1.3
-----------------------------------------------------------------------------------------------------------------
Mean
6.5 4.0 15.3 88 19.8 12.2 9.9 14.3 14.7 15.7 16.0 15.9 15.7 1010.0
Total 115.8 123.9 79.9 0.0 42.1
1961-1990 Climatological
Mean5.7 4.4 83 19.2 10.0 7.9 13.2 13.8 15.0 15.5 15.4 15.3 57.7 137.0 1016.8 40
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.0; 50% snow cover at 09h days 0; mean 0.0;
Hail days 1; mean 0.0; Ice pellets days 0; mean 0.0;
Thunder days 1; mean 0.9; Fog at 09h days 0; mean 0.6;
Gale days 0; mean 0.2;
Air frost days 0; mean 0.0 Days with 0.2mm rain days 19; mean 11.5*
Grass minimum frost days 0; mean 0.3 Days with 1.0mm rain days 13; mean 8.7*
Soil frost days 0 Days with 5.0mm rain days 8; mean 3.8*
Concrete frost days 0 Days with no sun days 1; mean 2.9
Minimum relative humidity - 55%/13th; Air pressure: max - 1034.0mb/13th, min - 994.5mb/9th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 05 haze, 10 mist,
21 recent rain, 28 recent fog, 46 fog, 60 intermittent light rain,
61 continuous light rain, 63 continuous moderate rain);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling; F fog at 09GMT;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard; G gale;
* Averages for Hurley (4km away)
\end{verbatim}
2nd wettest September since 1982 (124mm in 1995); warmest October since 1989 when 16.1C recorded.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR OCTOBER 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 7 10 02 01 97 14.6 91 16.8 13.5 11.3 14.3 14.7 15.4 15.7 15.6 15.4 10 0 0.0 2.5 000000 1002.5 0.0 0.0 1.1
02 6 00 00 02 97 12.2 88 13.9 11.2 8.1 12.6 14.3 14.5 15.2 15.3 15.4 10 0 0.0 0.0 000000 1013.0 0.0 0.0 1.1
03 1 09 09 02 97 10.5 70 12.0 5.9 1.8 9.3 10.2 12.4 14.1 14.7 15.3 10 0 0.1 2.5 000000 1016.0 0.1 0.0 1.1
04 8 12 02 02 97 10.4 76 13.2 8.9 7.8 10.9 11.4 12.7 13.6 14.1 15.1 10 0 1.0 2.5 000000 1008.5 2.4 0.0 1.0
05 8 11 05 02 97 9.4 90 12.5 8.4 7.5 10.4 11.1 12.5 13.4 13.8 14.9 10 0 17.1 0.7 000000 1011.5 8.9 0.0 1.1
06 8 06 05 61 95 10.5 96 11.6 9.4 8.5 11.2 11.3 12.2 13.1 13.5 14.6 20 0 0.0 0.0 000000 1017.5 0.0 0.0 1.1
07 8 33 05 02 97 11.1 92 12.9 9.6 8.6 10.6 10.7 11.9 12.7 13.1 14.4 10 0 0.5 0.0 000000 1021.0 0.2 0.0 1.3
08 8 33 13 60 97 10.7 88 11.8 9.8 8.5 10.6 10.7 11.9 12.6 13.0 14.2 10 0 0.0 0.0 000000 1027.0 0.0 0.0 1.9
09 8 23 02 02 97 11.2 84 15.0 9.7 9.3 10.5 10.7 11.6 12.2 12.7 14.0 10 0 3.0 4.3 000000 1024.5 2.2 0.0 1.0
10 8 27 02 02 97 11.6 91 15.1 10.2 6.2 11.6 11.6 12.5 12.8 12.8 13.8 10 0 2.2 1.3 000000 1010.5 2.6 0.0 0.7
11 8 28 05 02 96 14.5 94 17.6 9.2 6.9 11.7 11.6 12.2 12.7 12.9 13.7 10 0 0.0 6.0 000000 1008.0 0.0 0.0 1.4
12 0 30 09 02 97 10.1 83 15.9 8.8 5.9 9.9 10.4 11.9 12.8 12.9 13.7 10 0 4.9 7.7 000000 1015.5 2.6 0.0 1.7
13 8 24 02 60 97 9.8 91 17.1 8.4 6.6 10.6 10.7 11.9 12.7 12.8 13.7 10 0 0.3 0.0 000000 1017.5 0.6 0.0 0.7
14 7 21 13 02 97 17.1 91 18.0 9.8 14.9 14.2 13.8 13.6 13.0 12.8 13.5 10 0 0.0 2.7 000000 1013.0 0.0 0.0 0.7
15 5 00 00 02 96 8.5 91 16.5 6.2 3.5 9.4 10.1 12.0 13.0 13.0 13.6 10 0 0.0 6.3 000000 1023.0 0.0 0.0 1.0
16 5 00 00 02 97 10.2 96 16.8 5.6 3.8 9.2 9.7 11.2 12.5 12.8 13.6 10 0 13.3 0.0 000000 1014.5 9.5 0.0 0.6
17 8 30 05 63 94 11.8 96 14.0 10.0 9.5 12.2 12.3 12.9 12.9 12.7 13.4 20 0 0.0 6.0 000000 1000.5 0.0 0.0 1.5
18 2 00 00 02 97 5.0 87 12.2 0.7 -1.2 7.0 7.6 10.6 12.4 12.7 13.4 10 0 0.0 8.7 000000 1021.0 0.0 0.0 0.7
19 0 00 00 02 97 6.7 96 13.3 1.5 -0.8 6.1 6.9 9.2 11.1 12.0 13.4 10 0 0.0 6.5 000000 1019.0 0.0 0.0 0.9
20 7 32 02 03 96 9.8 98 16.0 3.7 0.6 6.8 7.2 9.1 10.8 11.6 13.1 10 0 3.6 2.0 000000 1022.0 7.4 0.0 1.1
21 8 20 13 21 96 16.0 96 18.3 9.8 7.1 11.4 11.4 11.2 11.1 11.5 12.9 10 0 0.0 1.8 000000 1008.0 0.0 0.0 1.3
22 8 21 13 02 97 16.4 94 17.9 13.7 10.0 13.1 12.8 12.7 12.2 11.9 12.7 10 0 6.6 0.0 000000 1014.0 6.9 0.0 1.2
23 8 23 13 02 97 16.6 93 17.1 15.7 14.4 14.2 14.0 13.8 13.0 12.5 12.8 10 0 4.3 2.3 000000 1007.5 3.2 0.0 1.1
24 8 25 05 60 97 11.9 96 14.7 5.7 2.6 9.9 10.2 11.8 12.9 12.7 12.9 10 0 19.7 0.0 000000 1005.5 7.0 0.0 1.7
25 0 27 13 02 97 12.8 69 13.2 9.1 6.0 9.0 9.6 11.1 12.1 12.1 13.0 10 0 0.7 5.2 000000 998.0 0.8 0.0 1.2
26 6 22 02 21 97 6.2 87 14.3 5.2 2.5 7.5 8.0 8.9 11.4 11.8 12.9 10 0 5.4 5.5 000000 1009.5 4.4 0.0 1.3
27 6 22 13 01 97 14.3 72 15.5 5.6 3.0 10.5 11.0 11.0 11.4 11.3 12.5 10 0 10.7 0.1 000000 1008.0 10.5 0.0 1.0
28 8 22 19 63 97 12.5 72 13.7 12.2 10.0 11.5 12.0 12.5 12.2 11.6 12.4 10 0 0.8 1.0 000000 1002.0 0.6 0.0 1.5
29 1 27 09 03 97 7.7 62 12.8 7.7 4.5 7.5 8.0 10.5 11.5 11.6 12.4 10 0 0.8 6.5 000000 1013.0 0.8 0.0 1.6
30 6 27 05 02 97 7.8 84 11.1 6.9 4.0 7.5 7.5 9.5 11.0 11.2 12.3 10 0 3.4 4.5 000000 1017.0 3.9 0.0 0.8
31 8 23 05 60 97 6.8 92 9.3 5.5 1.2 8.5 8.0 9.5 10.6 10.8 12.1 10 0 29.4 0.0 000000 1012.0 15.4 0.0 0.7
-----------------------------------------------------------------------------------------------------------------
Mean
6.0 6.2 11.1 87 14.5 8.3 6.2 10.3 10.6 11.8 12.5 12.7 13.6 1012.9
Total 127.8 86.6 90.0 0.0 35.1
1961-1990 Climatological
Mean5.4 5.1 88 15.3 7.5 5.3 10.1 10.8 11.7 12.4 12.6 13.2 60.4 97.0 1015.7 46
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.0; 50% snow cover at 09h days 0; mean 0.0;
Hail days 0; mean 0.0; Ice pellets days 0; mean 0.1;
Thunder days 0; mean 0.3; Fog at 09h days 0; mean 2.9;
Gale days 0; mean 0.3;
Air frost days 0; mean 0.6 Days with 0.2mm rain days 19; mean 14.3*
Grass minimum frost days 2; mean 3.9 Days with 1.0mm rain days 14; mean 10.0*
Soil frost days 0 Days with 5.0mm rain days 7; mean 3.8*
Concrete frost days 0 Days with no sun days 9; mean 6.8
Minimum relative humidity - 55%/25th; Air pressure: max - 1027.5mb/8th, min - 981.0mb/24th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing,
21 recent rain, 60 intermittent light rain, 61 continuous light rain, 63 continuous moderate rain);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evapoartion (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling; F fog at 09GMT;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard; G gale;
* Averages for Hurley (4km away)
4th wettest October since 1924, after 1987, 1960 and 1949.
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR NOVEMBER 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 1 35 02 02 96 5.9 94 10.4 3.7 0.1 6.6 7.2 8.9 10.0 10.7 12.1 20 0 1.9 6.5 000000 1009.0 4.1 0.0 0.7
02 8 25 05 60 95 6.2 98 9.5 3.3 -0.6 7.2 7.2 8.3 9.6 10.4 11.9 20 0 11.3 0.0 000000 1003.5 5.1 0.0 0.7
03 7 30 02 02 97 7.5 93 9.8 6.2 2.1 7.2 7.3 8.5 9.4 10.1 11.7 10 0 2.7 0.3 000000 990.0 2.0 0.0 0.8
04 4 02 02 02 97 1.3 98 8.0 1.1 -1.9 5.0 5.7 7.8 9.3 9.8 11.5 10 0 0.0 1.6 000000 1006.0 0.0 0.0 0.6
05 4 22 02 03 97 3.8 91 10.0 -0.2 -3.6 3.9 4.4 6.4 8.5 9.5 11.3 10 0 0.8 1.8 000000 1015.5 1.7 0.5 0.8
06 7 36 02 02 97 6.5 96 12.3 3.8 1.5 5.9 6.0 7.4 8.5 9.1 11.1 10 0 tr 1.8 000000 1024.0 0.0 0.0 0.5
07 7 12 02 02 95 7.3 96 13.0 3.5 -0.4 7.1 7.1 7.9 8.8 9.2 10.9 10 0 5.7 1.2 000000 1027.0 5.6 0.0 1.4
08 8 19 02 61 96 12.0 95 16.0 7.3 6.0 9.0 8.6 8.7 9.0 9.3 10.8 20 0 6.2 0.6 000000 1012.0 9.3 0.0 0.4
09 3 25 05 01 97 15.3 83 15.6 10.4 5.1 11.6 11.4 10.8 10.0 9.6 10.8 10 0 2.8 3.6 000000 1012.0 2.4 0.0 1.1
10 4 29 02 01 97 7.0 94 11.5 7.0 4.1 8.7 9.0 10.0 10.2 10.2 10.9 10 0 0.0 7.2 000000 1017.5 0.0 0.0 1.0
11 1 00 00 02 96 1.9 98 10.5 0.7 -2.9 4.4 5.3 7.6 8.4 10.1 10.9 10 0 7.3 6.5 000000 1028.0 4.7 0.0 1.3
12 7 13 02 02 96 6.6 95 10.0 1.9 1.8 7.0 7.2 8.0 8.9 9.5 10.8 10 0 0.9 0.7 000000 1006.5 2.8 0.0 0.9
13 8 23 02 02 97 6.0 91 8.8 5.2 1.8 6.6 6.9 8.1 9.0 9.3 10.7 10 0 7.2 0.0 000000 1007.0 6.2 0.0 0.6
14 8 30 09 60 96 5.0 92 8.5 4.4 2.5 6.6 6.8 7.9 8.7 9.2 10.6 10 0 0.1 2.2 000000 1002.0 0.1 0.0 0.9
15 0 34 05 02 97 5.5 89 8.6 3.3 -1.5 5.4 5.4 7.1 8.4 9.0 10.5 10 0 0.0 5.0 000000 1017.0 0.0 0.0 1.0
16 0 36 02 02 97 2.5 92 7.0 0.8 -3.2 2.9 3.7 5.9 7.9 8.6 10.3 10 0 0.0 7.3 000000 1028.0 0.0 0.0 0.6
17 6 00 00 42 05 1.3 98 5.9 -2.4 -5.4 2.1 2.7 5.0 7.1 8.0 10.1 10 0 0.0 5.1 000000 1032.0 0.0 10.0 0.3
18 7 23 02 02 94 1.8 99 6.2 -0.6 -3.4 2.7 2.8 4.5 6.5 7.5 9.8 10 0 tr 0.1 000000 1029.5 0.0 7.0 0.4
19 8 00 00 02 94 4.9 93 8.2 1.8 0.7 4.7 4.6 5.7 6.6 7.3 9.5 10 0 0.0 1.5 000000 1027.5 0.0 0.0 0.6
20 7 00 00 02 96 2.4 98 6.4 0.1 -3.1 2.8 3.3 5.0 6.5 7.2 9.4 10 0 0.0 0.0 000000 1033.0 0.0 0.0 0.4
21 8 21 02 02 96 2.8 89 6.5 -0.6 -4.1 3.0 3.0 4.5 6.2 7.1 9.1 10 0 0.0 0.0 000000 1035.0 0.0 2.2 0.9
22 7 23 02 02 97 2.6 86 5.8 -0.5 -3.9 3.1 3.1 4.4 6.0 6.8 9.0 10 0 0.0 0.0 000000 1027.5 0.0 2.0 0.9
23 7 18 02 02 96 0.5 99 5.9 0.5 -2.6 3.1 3.5 4.8 5.9 6.5 8.9 10 0 0.0 1.5 000000 1025.5 0.0 3.5 0.5
24 8 20 02 03 96 5.9 82 8.2 -0.8 -4.1 3.9 3.8 4.6 5.8 6.3 8.6 10 0 8.6 0.0 000000 1019.5 9.1 0.0 0.2
25 8 27 02 60 96 5.7 95 5.7 5.7 4.4 6.1 5.8 6.1 6.2 6.4 8.5 10 0 tr 0.0 000000 1018.0 0.0 0.0 0.1
26 6 25 02 02 96 4.8 96 10.3 0.9 -2.2 3.6 3.7 5.3 6.4 6.7 8.4 10 0 tr 0.0 000000 1021.0 0.0 0.0 0.3
27 7 22 02 02 96 6.3 95 11.4 4.8 0.0 4.4 4.4 5.7 6.3 6.7 8.3 10 0 1.3 0.0 000000 1022.5 3.0 0.0 0.1
28 8 25 02 10 94 11.4 96 11.8 6.3 5.4 7.9 7.3 7.2 7.0 7.0 8.4 10 0 3.6 0.2 000000 1013.0 3.1 0.0 0.2
29 1 00 00 02 97 2.2 96 7.6 -0.4 -4.1 2.7 3.3 5.4 6.9 7.1 8.4 10 0 0.0 5.9 000000 1021.5 0.0 2.0 0.7
30 7 30 02 02 96 4.8 93 6.8 2.2 0.0 4.4 4.2 5.1 6.3 6.8 8.5 10 0 0.0 3.1 000000 1032.0 0.0 0.0 0.9
-----------------------------------------------------------------------------------------------------------------
Mean
5.7 2.2 5.3 94 9.2 2.6 -0.4 5.3 5.5 6.8 7.8 8.4 10.1 1018.8
Total 60.4 63.7 59.2 27.2 19.8
Climatological
Mean5.6 5.5 89 10.4 3.8 1.7 6.1 6.7 7.7 8.6 9.2 10.6 62.3 60.4 1014.6 53
-----------------------------------------------------------------------------------------------------------------
Snow days 0; mean 0.6; 50% snow cover at 09h days 0; mean 0.1;
Hail days 0; mean 0.1; Ice pellets days 0; mean 0.1;
Thunder days 0; mean 0.2; Fog at 09h days 0; mean 3.4;
Gale days 0; mean 0.2;
Air frost days 7; mean 5.6 Days with 0.2mm rain days 13; mean 15.0*
Grass minimum frost days 16; mean 11.1 Days with 1.0mm rain days 11; mean 10.6*
Soil frost days 9 Days with 5.0mm rain days 6; mean 4.4*
Concrete frost days 11 Days with no sun days 9; mean 10.3
Minimum relative humidity - 65%/7th; Air pressure: max - 1036.0mb/30th, min - 985.5mb/3rd
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 10 mist,
42, fog, 60 intermittent light rain, 61 continuous light rain);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm);
Press air pressure (mb); E state of ground (00 dry, 10 moist, 20 wet);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling; F fog at 09GMT;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard; G gale;
* Averages for Hurley (4km away)
\end{verbatim}
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MAIDENHEAD METEOROLOGICAL OBSERVATIONS FOR DECEMBER 1998
-09GMT- --Temperature- --Soil temps-- -Earth temps-- Rain Fr. Pch
DD N dd ff ww VV Temp RH Max Min Gmin 5cm 10cm 20cm 30cm 50cm 1m E SS Rain Sun SLHTGF Press hrs hrs Evap
-----------------------------------------------------------------------------------------------------------------
01 8 05 02 02 97 3.8 88 4.8 2.1 -2.1 4.1 3.9 4.9 6.1 6.6 8.3 10 0 0.0 0.0 000000 1038.5 0.0 0.0 0.8
02 8 05 09 02 97 4.7 87 4.7 3.4 -0.2 3.9 3.8 5.0 5.9 6.4 8.2 10 0 0.0 3.5 000000 1034.0 0.0 0.0 1.0
03 8 09 05 02 97 2.1 83 4.8 1.9 0.7 3.3 3.3 4.5 5.6 6.2 8.0 10 0 tr 0.0 000000 1025.0 0.0 0.0 0.6
04 7 09 05 02 97 4.8 86 5.0 0.0 -3.1 3.7 3.6 4.4 5.2 5.7 7.9 10 0 0.0 5.6 000000 1017.0 0.0 2.7 1.0
05 7 33 02 02 97 1.5 81 6.1 -1.5 -5.7 1.1 1.3 3.1 4.8 5.6 7.8 40 0 0.2 1.5 000000 1018.0 0.3 10.0 0.7
06 0 00 00 02 97 -2.1 89 4.4 -3.6 -7.7 0.6 1.0 2.7 4.4 5.2 7.5 40 0 tr 6.2 000000 1027.0 0.0 12.5 0.3
07 7 00 00 02 97 1.0 96 8.4 -3.0 -7.6 0.9 0.8 2.2 3.7 4.7 7.4 40 0 0.3 0.5 500000 1030.5 0.7 4.5 0.4
08 8 22 02 21 96 8.4 97 10.1 1.0 -0.8 4.1 3.4 3.6 4.1 4.6 7.1 10 0 3.5 0.0 000000 1025.0 6.3 0.0 0.2
09 8 00 00 44 04 9.5 99 10.4 8.4 7.6 6.6 5.9 5.8 5.4 5.2 7.0 10 0 tr 0.0 000001 1021.0 0.0 0.0 0.0
10 8 23 02 02 96 9.3 97 9.8 6.6 0.6 6.6 6.2 6.3 6.0 5.7 7.0 10 0 6.2 0.0 000000 1019.0 4.3 0.0 0.2
11 7 00 00 02 96 7.2 95 13.1 4.8 -0.6 6.0 5.7 6.2 6.4 6.3 7.1 10 0 0.6 0.0 000000 1019.5 2.0 0.0 0.2
12 7 22 05 21 97 11.5 94 13.5 7.2 7.2 8.4 8.2 7.6 7.0 6.5 7.4 10 0 2.4 0.7 000000 1015.5 3.4 0.0 1.1
13 6 36 05 01 97 7.3 86 13.8 7.2 2.5 6.2 6.6 7.5 7.5 7.1 7.5 10 0 0.0 0.1 000000 1029.0 0.0 0.0 0.6
14 7 18 09 02 97 13.8 83 14.4 7.3 6.5 8.9 8.8 8.6 7.6 7.3 7.7 10 0 1.0 0.3 000000 1026.0 2.9 0.0 0.9
15 8 22 05 50 95 12.3 96 12.3 12.3 11.0 10.4 10.4 9.6 8.6 7.8 7.9 10 0 2.4 0.0 000000 1025.5 3.5 0.0 0.2
16 7 30 02 02 95 7.5 98 10.6 5.6 -0.1 7.1 7.1 8.1 8.5 8.2 8.1 10 0 0.0 0.5 000000 1033.0 0.0 0.0 0.5
17 8 22 09 02 96 7.0 89 10.1 6.3 1.4 6.7 6.9 7.7 8.1 8.1 8.4 10 0 2.1 0.0 000000 1026.0 1.7 0.0 0.6
18 2 22 02 01 97 7.1 97 10.2 6.4 0.2 6.6 6.8 7.9 8.0 7.9 8.4 10 0 5.1 0.7 000000 1019.0 2.7 0.0 0.7
19 6 33 02 02 97 5.5 84 8.3 4.9 0.7 5.0 5.4 6.9 7.8 7.8 8.4 10 0 tr 2.2 000000 1015.0 0.0 0.0 0.7
20 5 36 13 02 97 2.9 87 5.0 2.6 0.2 3.7 4.1 5.8 7.1 7.5 8.4 10 0 0.0 5.7 000000 1016.5 0.0 2.9 0.7
21 7 00 00 03 97 -1.6 96 4.9 -3.2 -7.2 1.3 1.7 3.9 6.0 6.7 8.3 40 0 0.7 0.7 000000 1026.5 1.6 10.5 0.3
22 9 00 00 46 04 3.8 98 9.6 -1.6 -3.8 4.2 3.8 4.5 5.5 6.2 8.0 10 0 1.0 0.0 000001 1025.0 2.0 0.0 0.2
23 8 23 09 02 97 9.6 88 9.6 3.8 -2.0 6.6 5.8 5.8 5.9 6.1 7.8 10 0 7.8 0.0 000000 1018.5 7.4 0.0 0.1
24 5 31 02 02 97 0.0 90 11.5 -0.7 -5.1 2.0 2.2 4.5 6.0 6.2 7.7 40 0 3.8 2.1 000000 1023.0 5.8 2.0 0.5
25 8 23 09 02 97 11.5 91 12.0 0.0 3.4 7.7 6.9 6.5 6.1 6.1 7.6 10 0 8.6 0.0 000000 1017.5 5.2 0.0 0.8
26 7 25 02 03 97 6.4 89 12.7 4.4 -0.8 5.1 5.3 6.3 6.8 6.6 7.5 10 0 5.8 0.0 000000 1014.5 5.1 0.0 0.7
27 8 15 05 03 97 7.0 77 9.3 6.4 0.3 5.0 5.3 6.4 6.8 6.7 7.6 10 0 0.2 0.0 000000 1002.0 1.1 0.0 1.9
28 8 30 02 02 97 6.2 74 8.0 5.9 1.2 4.8 5.3 6.2 6.9 6.9 7.7 10 0 0.0 4.2 000000 1006.5 0.0 4.0 0.7
29 8 22 02 03 97 5.9 94 11.2 -1.3 -4.8 2.6 3.0 4.3 6.0 6.6 7.7 10 0 tr 0.1 000000 1010.5 0.0 4.5 1.3
30 8 21 13 02 97 10.9 82 12.1 5.9 5.4 6.7 6.2 6.1 6.2 6.3 7.6 10 0 1.9 2.0 000000 1003.5 2.5 0.0 0.7
31 7 21 09 02 97 8.8 95 9.5 8.8 5.4 7.7 7.2 7.2 7.0 6.7 7.6 10 0 7.0 0.0 000000 1002.5 3.2 0.0 0.3
-----------------------------------------------------------------------------------------------------------------
Mean
6.9 4.3 6.2 90 9.4 3.5 0.1 5.1 5.0 5.8 6.4 6.5 7.8 1020.3
Total 60.6 36.6 61.7 53.6 18.9
Climatological Mean
6.0 5.7 89 7.8 2.0 0.0 4.3 4.5 5.3 6.0 6.7 8.1 64.0 39.7 1015.0 59
-----------------------------------------------------------------------------------------------------------------
Snow days 1; mean 1.9; 50% snow cover at 09h days 0; mean 1.5;
Hail days 0; mean 0.1; Ice pellets days 0; mean 0.3;
Thunder days 0; mean 0.2; Fog at 09h days 2; mean 2.2;
Gale days 0; mean 0.2;
Air frost days 7; mean 8.8 Days with 0.2mm rain days 19; mean 16.2*
Grass minimum frost days 15; mean 15.9 Days with 1.0mm rain days 14; mean 11.2*
Soil frost days 6 Days with 5.0mm rain days 6; mean 5.2*
Concrete frost days 7 Days with no sun days 14; mean 15.0
Air pressure: max - 1038.5mb/1st, min - 997.5mb/26th
Key
DD: date
07GMT observations...
N cloud cover (oktas, 9=obscured); dd wind direction (degrees/10); ff wind speed (knots);
VV visibility (00-50 metres/100, 94 very poor, 95 poor, 96 moderate, 97 good);
Soil temperatures are for 07GMT beneath a bare soil surface (degC);
Earth temperatures are for 07GMT beneath a grass surface (degC); SS snow depth (cm)
ww present weather code (01 cloud decreasing, 02 sky not changing, 03 cloud increasing, 21 recent rain,
44, 46 fog, 50 intermittent light drizzle);
09GMT observations...
Temp temperature (degC); RH relative humidity (%); SS snow depth (cm); Press air pressure (mb);
E state of ground (10 moist, 40 frozen);
24 hour readings...
Max maximum temperature (degC) beginning 09GMT, Min minimum temperature (degC) ending 09GMT;
Gmin grass minimum temperature (degC) ending 09GMT; Pch Evap Piche evaporation (ml) beginning O9GMT;
Rain rainfall beginning 09GMT (mm); Sun sunshine (hours) sunrise-sunset;
Rain hrs hours of rainfall (>0.1mm/hr) 09-09GMT; Fr. hrs hours of air frost (00-24GMT)
Days with...
S snow/sleet falling; L 50% snow cover at 09GMT; H>4 hail falling; F fog at 09GMT;
H<5 ice pellets, snow grains, snow pellets falling; T thunder heard; G gale;
* Averages for Hurley (4km away)
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Monthly and annual summary statistics for 1998 at Boyn Hill (Maidenhead, Berkshire)
Comparison with recent years of annual values
--------Temperature (degC)-------- -Rainfall (mm)- Sunshine (hrs) Days with Piche
Mean Max Min Grass Total >= >= Total no AF GF SF SL T F09 Evaporation
Air 30cm 100cm Air Air Min 0.2 1.0 sun (ml)
1989 11.7 11.9 11.8 33.0 -6.3 -10.4 604.3 145 106 1802.8 60 35 88 4 0 15 13 -
1990 11.6 11.9 11.8 35.3 -4.1 -7.2 492.5 132 101 1772.3 50 21 92 5 1 11 7 -
1991 10.5 10.7 10.7 28.5 -8.4 -13.9 527.2 145 96 1364.3 80 49 95 10 9 10 13 -
1992 10.9 11.2 11.1 29.5 -6.2 -9.5 712.6 170 118 1328.7 80 43 91 5 1 15 14 -
1993 10.6 10.9 10.9 27.4 -4.8 -7.8 681.5 151 112 1333.1 78 31 83 8 0 12 11 555.8
1994 11.4 11.4 11.2 31.9 -5.2 -7.6 649.0 172 131 1445.9 81 27 81 7 3 9 11 581.5
1995 11.7 12.1 11.9 33.9 -5.3 -7.8 627.7 141 105 1640.7 71 44 70 15 2 16 8 675.4
1996 10.3 10.7 10.6 31.4 -4.8 -8.3 500.9 133 88 1496.4 75 57 96 21 8 8 8 614.6
1997 11.5 11.6 11.4 31.3 -5.3 -9.1 553.0 139 105 1630.0 68 43 83 7 0 13 15 579.7
1998 11.4 11.6 11.5 29.8 -4.0 -8.2 798.9 176 133 1397.4 69 30 84 5 0 15 5 517.2
(AF=air frost, GF=ground frost, SF=snow falling, SL:>=50 per cent snow cover at 09GMT, T=thunder, F09=fog at 09GMT)
Cloud amount Wind speed Humidity Grass minimum temperature
(oktas) at 07h (kts) at 09h (%) (degC)
Mean Anomaly Mean Anomaly Mean Anomaly High Low Mean Anomaly
J 6.0 0.5 5.2 -1.5 88 -1 9.5 -6.6 -0.4 0.4
F 5.3 -0.4 2.5 -4.0 89 1 7.0 -8.2 -1.0 0.3
M 6.6 0.6 4.0 -2.3 86 3 12.0 -5.7 2.8 2.8
A 6.8 1.7 4.5 -1.6 86 9 9.1 -3.7 3.0 1.0
M 6.1 1.2 4.5 -1.9 74 1 14.7 -0.8 7.7 2.1
J 6.6 1.3 5.3 -0.3 81 9 14.5 4.2 10.1 1.1
J 6.2 1.0 4.4 -1.1 77 4 14.5 6.5 10.5 -0.3
A 4.9 -0.3 4.1 -1.2 73 -4 15.7 5.1 9.0 -1.5
S 6.5 0.8 4.0 -0.4 88 5 14.4 3.6 9.9 2.0
O 6.0 0.6 6.2 1.1 87 -1 14.9 -1.2 6.2 0.9
N 5.7 0.1 2.2 -3.3 94 5 6.0 -5.4 -0.4 -2.1
D 6.9 0.9 4.3 -1.4 90 1 11.0 -7.7 0.1 0.1
1998 6.1 0.6 4.3 -1.5 84 2 15.7 -8.2 4.8 0.5
Maximum temperature Minimum temperature Monthly mean
(degC) (degC) Temperature (degC)
High Low Mean Anomaly High Low Mean Anomaly Mean Anomaly
J 14.4 4.1 8.7 1.6 10.5 -1.9 2.7 1.6 5.7 1.6 14.4 - highest Jan reading since 1975
F 18.4 3.5 12.1 4.3 9.3 -4.0 3.2 1.9 7.7 3.1 2nd mildest Feb since 1863
M 17.1 8.4 12.4 1.7 12.9 -2.2 5.5 2.8 8.9 2.2 12.9 min - highest Mar value for over 45 years
A 22.7 5.0 12.9 -0.6 10.9 -0.5 5.3 0.5 9.1 0.0
M 25.9 10.8 20.1 3.0 17.3 1.1 9.8 1.9 14.9 2.4 mildest May for 6 years
J 28.1 13.0 19.9 -0.1 16.2 5.8 11.8 1.1 15.9 0.5
J 26.2 17.0 21.4 -0.7 16.4 8.9 12.5 0.0 16.9 -0.4 coolest July for 5 years
A 29.8 17.3 23.1 1.4 15.7 7.5 11.6 -0.6 17.3 0.4 coolest Aug for 5 years
S 24.8 15.0 19.8 0.6 16.0 6.5 12.2 2.2 16.0 1.4 warmest Sept since 1989
O 18.3 9.3 14.5 -0.8 15.7 0.7 8.3 0.8 11.4 0.0
N 16.0 5.7 9.2 -1.2 10.4 -2.4 2.6 -1.2 5.9 -1.2 coolest Nov for 5 years
D 14.4 4.4 9.4 1.6 12.3 -3.6 3.5 1.5 6.5 1.6
1998 29.8 3.5 15.3 0.9 17.3 -4.0 7.5 1.1 11.4 1.0
Soil temperatures recorded at 07h (degC)
------5cm depth------- ------10cm depth------ ------20cm depth------
High Low Mean Anomaly High Low Mean Anomaly High Low Mean Anomaly
J 8.9 1.1 4.4 1.1 8.3 1.7 4.3 1.0 7.9 2.5 5.2 1.1
F 7.1 0.0 4.3 1.4 7.5 0.4 4.5 1.2 8.6 1.8 5.6 1.5
M 11.6 2.7 7.0 2.4 11.4 3.1 7.0 2.1 11.1 4.9 7.9 2.1
A 11.6 3.7 8.0 0.8 11.4 3.9 8.1 0.4 11.7 5.8 9.2 1.0
M 17.5 8.5 13.2 2.5 17.5 9.0 13.5 2.8 18.3 9.3 14.6 2.5
J 18.6 11.1 15.3 1.0 17.9 11.2 15.3 0.8 18.1 13.4 16.1 0.5
J 18.3 14.1 15.8 -0.2 18.6 14.6 16.2 -0.2 19.3 15.7 17.3 0.0
A 18.6 12.1 15.5 -0.1 19.2 12.9 16.0 -0.2 19.8 15.2 17.4 0.2
S 16.7 10.6 14.3 1.1 16.9 11.5 14.7 0.9 17.6 13.0 15.7 0.7
O 14.3 6.1 10.3 0.2 14.7 6.9 10.6 -0.2 15.4 8.9 11.8 0.1
N 11.6 2.1 5.3 -0.8 11.4 2.7 5.5 -0.8 10.8 4.4 6.8 -0.9
D 10.4 0.6 5.1 0.8 10.4 0.8 5.0 0.5 9.6 2.2 5.8 0.5
1998 18.6 0.0 9.9 0.8 19.2 0.4 10.1 0.7 19.8 1.8 11.1 0.7
Earth temperatures recorded at 07h (degC)
------30cm depth------ ------50cm depth------ ------100cm depth-----
High Low Mean Anomaly High Low Mean Anomaly High Low Mean Anomaly
J 7.8 4.1 5.9 1.2 7.4 4.6 6.1 0.7 8.0 6.3 7.4 0.8
F 8.2 3.1 6.2 1.6 7.7 3.7 6.1 1.0 7.7 5.5 6.7 0.7
M 10.3 6.6 8.2 2.3 9.5 6.8 7.9 1.7 8.9 7.5 8.1 1.7
A 11.4 7.4 9.7 1.0 10.5 7.4 9.2 0.9 9.9 8.4 9.2 1.2
M 17.5 10.5 14.4 2.2 16.0 10.2 13.4 2.2 13.9 10.0 12.1 2.0
J 18.3 14.5 16.1 0.9 16.9 14.4 15.4 1.3 15.4 13.6 14.3 1.8
J 18.6 16.1 17.3 0.0 17.5 15.7 16.8 0.5 16.4 15.1 15.7 0.6
A 19.4 16.0 17.7 0.5 18.6 16.3 17.5 0.5 17.2 16.1 16.7 0.6
S 17.5 14.5 16.0 0.5 17.2 14.6 15.9 0.5 16.4 15.1 15.7 0.4
O 15.7 10.6 12.5 0.1 15.6 10.8 12.7 0.1 15.4 12.1 13.6 0.4
N 10.2 5.8 7.8 -0.8 10.7 6.3 8.4 -0.8 12.1 8.3 10.1 -0.5
D 8.6 3.7 6.4 0.4 8.2 4.6 6.5 -0.2 8.4 7.0 7.8 -0.3
1998 19.4 3.1 11.6 0.9 18.6 3.7 11.4 0.7 17.2 5.5 11.5 0.8
Rainfall (mm)
Total Per Max ---------Number of days with---------------
Cent Fall >=0.2 Anomaly >=1.0 Anomaly >=5.0 Anomaly
J 68.9 120 12.8 13 -4.2 11 -0.9 7 2.2
F 8.2 21 2.7 5 -7.6 3 -5.4 0 -3.0
M 54.2 105 9.6 15 -0.3 10 -0.6 5 1.1
A 106.0 231 11.5 24 9.9 18 7.9 9 5.6
M 44.6 82 17.4 9 -4.7 7 -3.3 4 0.4
J 98.8 188 17.2 21 9.5 18 9.8 8 4.4
J 29.6 63 11.5 10 -0.9 9 1.4 1 -1.8
A 23.8 41 8.5 9 -3.4 5 -3.6 2 -1.4
S 115.8 201 22.8 19 7.5 13 4.3 8 4.2
O 127.8 212 29.4 19 4.7 14 4.0 7 3.2
N 60.4 97 11.3 13 -2.0 11 0.4 6 1.6
D 60.6 95 8.6 19 2.8 14 2.8 6 0.8
1998 798.9 123 29.4 176 11.3 133 16.8 63 17.3
Sunshine (hours) Number of days with
Total Per 24hr Sunless days Gale Fog at 09h
Cent Max Total Anomaly Anomaly Anomaly
J 66.1 142 6.8 9 -4.0 1 0.3 0 -2.5
F 109.7 168 8.8 3 -6.5 0 -0.4 3 1.0
M 81.0 76 9.7 10 3.6 0 -0.4 0 -0.8
A 86.1 61 10.7 4 0.6 0 0.0 0 -0.1
M 204.3 109 14.5 2 -0.3 0 0.0 0 -0.1
J 138.0 72 10.8 3 0.9 0 0.0 0 -0.1
J 149.2 78 11.5 2 0.3 0 0.0 0 -0.1
A 252.2 139 14.4 1 -1.2 0 0.0 0 -0.4
S 123.9 90 8.4 1 -1.9 0 0.0 0 -0.6
O 86.6 89 8.7 9 2.2 0 -0.3 0 -2.9
N 63.7 105 7.3 9 -1.3 0 -0.2 0 -3.4
D 36.6 92 6.2 14 -1.0 0 -0.2 2 -0.2
1998 1397.4 97 14.5 67 -9.6 1 -1.2 5 -10.2
Number of days with
Snow falling 50% snow cover ---Hail----- Ice Pellets Thunder heard
at 09h
Anomaly Anomaly Anomaly Anomaly Anomaly
J 0 -3.6 0 -3.5 1 1.0 1 0.7 1 0.7
F 1 -2.4 0 -2.1 0 -0.2 0 -0.4 0 -0.2
M 0 -2.7 0 -0.6 0 -0.5 0 -0.5 0 -0.5
A 3 2.0 0 -0.1 1 0.4 3 2.7 7 6.4
M 0 -0.1 0 0.0 0 -0.3 0 -0.1 1 -0.8
J 0 0.0 0 0.0 0 -0.1 0 0.0 3 0.7
J 0 0.0 0 0.0 0 -0.1 0 0.0 1 -0.9
A 0 0.0 0 0.0 0 0.0 0 0.0 1 -0.5
S 0 0.0 0 0.0 1 1.0 0 0.0 1 0.1
O 0 0.0 0 0.0 0 0.0 0 -0.1 0 -0.3
N 0 -0.6 0 -0.1 0 -0.1 0 -0.1 0 -0.2
D 1 -0.9 0 -1.5 0 -0.1 0 -0.3 0 -0.2
1998 5 -8.3 0 -7.9 3 1.0 4 1.9 15 4.3
Air Pressure (millibar) Number of days with
Mean at 09h Air frost Ground frost
High Low Anomaly Anomaly Anomaly
J 1037.0 978.0 1015.1 0.0 8 -3.5 18 0.2
F 1040.5 1010.0 1026.0 10.5 5 -5.0 18 0.3
M 1043.0 992.5 1023.1 8.1 2 -4.4 9 -6.5
A 1019.5 982.0 1003.9 -11.3 1 -1.1 5 -4.2
M 1029.0 1005.0 1018.4 3.2 0 -0.2 1 -1.0
J 1025.5 1001.5 1014.0 -3.0 0 0.0 0 0.0
J 1025.0 1000.0 1013.9 -3.6 0 0.0 0 0.0
A 1030.0 1003.0 1019.5 3.1 0 0.0 0 0.0
S 1034.0 994.5 1010.0 -6.8 0 0.0 0 -0.3
O 1027.5 981.0 1012.9 -2.8 0 -0.6 2 -1.9
N 1036.0 985.5 1018.8 4.2 7 1.4 16 4.9
D 1038.5 997.5 1020.3 5.3 7 -1.8 15 -0.9
1998 1043.0 978.0 1016.3 0.5 30 -15.2 84 -9.4
Number of hours with Piche evaporation (ml)
Rain falling Air frost Monthly Daily
Total Anomaly Total total Max
J 57.0 0.0 27.8 30.4 1.9
F 6.4 -36.6 53.3 29.5 2.1
M 74.5 17.5 12.3 38.9 2.2
A 84.6 39.6 2.1 41.0 3.0
M 22.7 -23.7 0.0 73.2 4.3
J 65.9 24.9 0.0 50.9 3.2
J 29.7 -6.3 0.0 62.6 3.3
A 19.7 -19.3 0.0 74.8 4.1
S 79.9 39.9 0.0 42.1 2.3
O 90.0 44.0 0.0 35.1 1.9
N 59.2 6.2 27.2 19.8 1.4
D 61.7 2.7 53.6 18.9 1.9
1998 651.3 90.3 176.3 517.2 4.3
Number of days in 1998 when certain conditions observed at 07h
1998 1997 1996 1995 1994 1998 1997 1996 1995 1994
Cloud obscured 7 14 5 5 6 Wind N 32 24 44 43 28
8/8 cloud 150 144 147 139 152 NE 23 32 34 36 22
6/8 to 7/8 cloud 122 106 99 99 108 E 22 34 61 43 45
3/8 to 5/8 cloud 33 29 31 33 41 SE 13 23 26 31 22
1/8 to 2/8 cloud 28 40 45 36 27 S 41 51 47 36 47
Sky cloudless 25 32 39 53 31 SW 82 55 43 60 82
W 62 58 41 48 67
Visibility < 100m 0 0 0 0 0 NW 54 32 29 39 28
100-190m 1 4 2 1 2 calm 36 56 41 29 24
200-390m 3 8 2 6 4 force 1-3 308 285 290 309 320
400-900m 7 11 10 8 9 force 4-5 21 24 32 27 20
1.0-1.9km 19 17 19 13 19 force 6-7 0 0 3 0 1
2.0-3.9km 17 20 35 23 35 force 8-12 0 0 0 0 0
4-9km 62 73 73 78 73
10km or more 256 232 225 236 223
Highlights
January was a mild month; the first 7 days were quite wet, but the
last 13 were mainly dry with sharp ground frosts. On the 9th the air
temperature rose to 14.4degC, the highest January temperature since
1975.
February was a mild, dry and sunny month, but with suprisingly little
air frost. In fact, it was the second mildest February since 1863 and
the sunniest for 10 years. Only 3 days received over 1 millimetre of
precipitation, and the anticyclonic nature of the month was shown by
the mean air pressure which was 10.5 mb above normal. There were some
sharp ground frosts during the first 8 days.
March was mild, albeit cooler than in 1997, and on the night of the
29th/30th the temperature stayed above 12.9degC - the warmest March
night for over 45 years. It was dry from the 13th to 23rd due to a
prevailing area of high pressure and on the 19th the air pressure rose
to 1043 mb.
April was the wettest in Maidenhead since at least 1859, with the
first 19 days being particularly wet. Not suprisingly, sunshine
amounts were significantly below average, and air pressure was 11.3 mb
below normal indicating the cyclonic nature of the month. Thunder
occurred on 7 days, a very high incidence for April.
May was mild and sunny with less rainfall than normal. There was a
warm spell from the 8th to the 20th when the ground dried out
considerably; the sunniest day of the year occurred on the 17th.
June was wet, the total rainfall ranking as about a 1 in 10 year event
for Maidenhead. The number of days with 1.0mm or more was the highest
in June for over 45 years. The cloud associated with the rain kept the
nights much warmer than normal, and sunshine totals were well below
average. Only two days received more than 10 hous of sunshine.
July was dry and dull, with daytime temperatures a little below
normal. On only one day did the temperature exceed 25degC.
August was the most summery month of the year, being warm, dry and
sunny. The perid of the 4th to the 12th ws the sunniest spell of the
month, and daytime temperatures rose to 28degC on 4 days during this
period.
September was mild and wet, being the second wettest September since
1982 and the mildest September since 1989 due to some warm nights at
the start and end of the month.
October was also wet, being the fourth wettest since 1924. Over 29mm
of rain fell on the 31st, and there were 14 days with over 1.0mm of
rain falling.
November was colder than normal, with a large number of ground frosts
and many days with airflow from an easterly direction during the
second half of the month. Anticyclone conditions prevailed for much of
the last fortnight, but skies were mainly cloudy then. A
close-to-average sunshine total for the month resulted from bright
spells, between periods of rain, during the first half of the month.
December was a mild month with winds predominantly from westerly and
southwesterly directions. Maidenhead did, however, escape much of the
very wet weather that affected some other parts of the the south and
west of Britain.
Overall, 1998 will be remembered for its rainfall. The total fall of
precipitation (798.9mm) was the greatest since 1974, and both the
number of raindays (days with 0.2mm or more) and the number of wetdays
(days with 1.0mm or more) were the greatest for at least 18 years.
June was wet, but otherwise the summer was quite dry; the spring and
autumn were wet.
The mean minimum temperature of 7.5degC was the equal highest on
record (with 1994), while the minimum temperature of -4.0degC was the
highest annual value since before 1953. The average temperature of
11.4degC for the year meant that 1998 was the fifth equal warmest year
in Maidenhead since thermometers were invented. The highest
temperature of the year was below 30degC for the first time in 5
years, while the lowest daytime maximum of 3.5degC recorded during the
year was the highest such value for over 45 years.
There was a marked lack of fog in 1998, with the number of days with
visibility below 1000m at 0900 GMT being the lowest since 1967.
Snowfall occurrence was below normal, while the incidence of thunder
was above normal due to a thundery April.
The sunshine total for the year was slightly below average, due to
dull spells from April to September; only August was much sunnier than
normal during this period, one reason (prehaps) why the summer will
not be remembered as `a good one' despite the positive temperature
anomalies and reduced rainfall during this period. It is worth noting
that the number of sunless days was lower than normal due to the very
sunny January and February.
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Last updated 4 January 1999. This page is maintained by
brugge@met.reading.ac.uk
© 1999 Roger Brugge