Weather data

Weather this month in Reading

The weather of Reading in January

Average air temperatures in Reading tend to vary little during January, ranging from about 7.7 ºC (maximum) to 1.9 ºC (minimum), an average of 4.3 ºC. The highest temperatures tend to occur towards the end of the month - but not always; the highest was 14.7 ºC at Whiteknights on 9 January 1998 (a warm month, the 9th being part of a run of ten days with maximum temperatures above 10 ºC). Daily maximum temperatures remained below freezing on 91 occasions during 1908-2014 and January is the most likely month to have an 'ice day' (a day when the temperature remains below 0.0 ºC for 24 hours). Among the very cold days since 1908 have been those of 12-13 January 1987 (maximum temperatures of -6.8 ºC and -3.9 ºC). During the eight days from 17 January 1963, maximum temperatures ranged from -0.6 ºC to -5.6 ºC.

Air minimum temperatures below -10 ºC have occurred on 13 January mornings in the Reading record, with the lowest being -14.5 ºC on 14 January 1982 (this was also the lowest air temperature for any month). In 1963 minimum temperatures included -12.5 ºC, -12.1 ºC, -11.7 ºC and -11.3 ºC on consecutive mornings from the 23rd to 26th - arguably the coldest spell of nights in the record for any month. January 2007 (average temperature 7.6 ºC) is the warmest January month in the record; while 1963 (-2.0 ºC) and 1940 (-0.9 ºC) were the coldest - that of 1963 was part of a winter with persistent cold weather and lying snow. There was no January air frost in 1938 or 2008, while the frostiest January was that of 1963 with 27 air frosts.

The monthly mean rainfall for January in Reading is about 61 mm, with some of this falling as snow in most years. The wettest January in the record was that of 2014 when 151 mm fell, while in 1987 only 9 mm of precipitation was recorded (with just 1 mm in the final 18 days of the month). Three January days have collected in excess of 25 mm of precipitation, the wettest being 15 January 1918 with 29.0 mm.

The sunshine duration in January is slightly more than in December and amounts to about 56 hours, with about 11 days being sunless on average. The sunniest and dullest January months were those of 1984 (91 h) and 1996 (19 h - with 19 sunless days). In January a daily total of 8 h or more has occurred only in two years - 1986 and 1987 - with 8.1 h on the 30 January 1987 making this the sunniest January day on record. But in the same month 14 days from the 14th were all sunless.

Snow or sleet falls on about three days on average during January but during 1968-2014 there were nine January months without snowfall, eight of these occurring after 1988. The snowiest January month since 1908 was in 1963 (15 days with snowfall). The 18 mornings with the greatest snow depths observed during January were all observed in 1963 and 2010, with a depth of 31 cm on 3 January 1963. Thunder is rarely heard in January, occurring on about three January months in 10. During 1981-2010 fog was present at 0900 GMT on an average of 2.2 days in January. The only known gusts in January above 70 knots occurred on 2 January 1976 (75 kn, 39 m/s) and 25th January 1990 (76 kn, 39 m/s).

All averages refer to the period 1981-2010 unless otherwise stated.

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