Might your date selection depend upon the variables you wish to download?
If so, check here:
| Variable | From | Until
| ---- | Variable | From | Until
|
|---|
| miscellaneous
|
| Observer | 19080101 | current
| | | Max 1sec gust (m/s) | 20070101 | current
|
| pressure
|
| Barometer temp (degF) | 19080101 | 19671231
| | | Station pressure as read (ins) | 19080101 | 19671231
|
| Barometer temp (degC) | 19080101 | current
| | | Station pressure (mb) | 19080101 | current
|
| MSL pressure (ins) | 19080101 | 19671231
| | | MSL pressure (mb) | 19080101 | current
|
| METFiDAS MSLP (mb) | 20090101 | current
|
| 09GMT temperature
|
| Dry bulb temp (degF) | 19080101 | 19711231
| | | Wet bulb temp (degF) | 19080101 | 19711231
|
| Dew point (degF) | 19080101 | 19711231
| | | Vapour pressure (ins) | 19080101 | 19711231
|
| Dry bulb temp (degC) | 19080101 | current
| | | Wet bulb temp (degC) | 19080101 | current
|
| Dew point (degC) | 19080101 | current
| | | Vapour pressure (mb) | 19080101 | current
|
| Relative humidity (%) | 19080101 | current
|
| temp. extremes
|
| Maximum temperature (degF) | 19080101 | 19711231
| | | Minimum temperature (degF) | 19080101 | 19711231
|
| Grass minimum temp (degF) | 19200101 | 19711231
| | | Soil minimum temp (degF) | 19610101 | 19711231
|
| Maximum temperature (degC) | 19080101 | current
| | | Minimum temperature (degC) | 19080101 | current
|
| Grass minimum temp (degC) | 19200101 | current
| | | Soil minimum temp (degC) | 19610101 | current
|
| Concrete minimum temp (degC) | 19710101 | current
| | | Mean daily temp (degC) | 19080101 | current
|
| Daily temp range (degC) | 19080101 | current
|
| soil temperatures
|
| 5cm soil temp (degF) | 19610101 | 19711231
| | | 10cm soil temp (degF) | 19610101 | 19711231
|
| 6ins soil temp (degF) | 19100101 | 19111231
| | | 20cm soil temp (degF) | 19610101 | 19701231
|
| 30cm soil temp (degF) | 19100101 | 19711231
| | | 50cm soil temp (degF) | 19710101 | 19711231
|
| 100cm soil temp (degF) | 19710101 | 19711231
| | | 2ft soil temp (degF) | 19110101 | 19701231
|
| 4ft soil temp (degF) | 19240101 | 19701231
| | | 5cm soil temp (degC) | 19610101 | current
|
| 10cm soil temp (degC) | 19610101 | current
| | | 6ins soil temp (degC) | 19100101 | 19111231
|
| 20cm soil temp (degC) | 19610101 | current
| | | 30cm soil temp (degC) | 19100101 | current
|
| 50cm soil temp (degC) | 19710101 | current
| | | 100cm soil temp (degC) | 19710101 | current
|
| 2ft soil temp (degC) | 19110101 | 19701231
| | | 4ft soil temp (degC) | 19240101 | 19701231
|
| cloud and wind
|
| Cloud cover (tenths) | 19080101 | 19581231
| | | Cloud cover (oktas) | 19590101 | current
|
| Wind direction (point) | 19080101 | 19181231
| | | Wind direction (deg/10) | 19080101 | current
|
| Wind speed (Beaufort scale) | 19080101 | 19600430
| | | Wind speed (mph) | 19600501 | 19610731
|
| Wind speed (m/s) | 20100101 | current
| | | Wind speed (kn) | 19080101 | 19610731
|
| Run of wind 38 feet (mls) | 19740101 | 19891031
| | | Run of wind 38 feet (km) | 19740101 | 19891031
|
| Run of wind 25 feet (mls) | 19600101 | 19841231
| | | Run of wind 25 feet (km) | 19600101 | 19841231
|
| Run of wind 10 m (mls) | 19890101 | 19921231
| | | Run of wind 10 m (km) | 19890101 | 19921231
|
| Cup counter 2m (mls) | 19680101 | 20051231
| | | Max 3 sec gust (mph) | 19610101 | 20061231
|
| Max 3 sec gust (m/s) | 20070101 | current
| | | Max 3 sec gust (kn) | 19680101 | 20061231
|
| Cup counter 2m (km) | 19680101 | 20051231
|
| weather and visibility
|
| Present weather (code) | 19080101 | current
| | | Today snow(5) or sleet(1) | 19080101 | current
|
| 50% snow cover at 09GMT(1) | 19080101 | current
| | | Today thunder heard(1) | 19080101 | current
|
| Today hail any size(1) | 19080101 | 19591231
| | | Today hail(0,4-7) | 19080101 | current
|
| Visibility (old code) | 19080101 | 19780616
| | | Visibility (new code) | 19600601 | current
|
| Today fog at 0900GMT (1) | 19080101 | current
| | | Today gale force winds(1) | 19080101 | current
|
| rainfall
|
| Rainfall 24h from 09GMT (ins) | 19080101 | 19701231
| | | Rainfall 24h from 09GMT (mm) | 19080101 | current
|
| Rain duration from 09GMT (h) | 19120101 | current
| | | Rain day | 19080101 | current
|
| Wet day | 19080101 | current
| | | Very wet day | 19080101 | current
|
| Grd level rain from 09GMT (ins) | 19680101 | 19701231
| | | Int rain from 09GMT (ins) | 19680101 | 19701231
|
| Grd level rain from 09GMT (mm) | 19680101 | current
| | | Int rain from 09GMT (mm) | 19680101 | current
|
| temperature counters
|
| Air frost, air min<0C | 19080101 | current
| | | Ground frost, grass min<0C | 19200101 | current
|
| Soil frost, soil min<0C | 19610101 | current
| | | Concrete frost, concrete min<0C | 19710101 | current
|
| Frost day, air max<0C | 19080101 | current
| | | Warm day, air max>=25C | 19080101 | current
|
| Hot day, air max>=30C | 19080101 | current
| | | Warm night, air min>=15C | 19080101 | current
|
| snow depth and solar max temps
|
| Total snow depth (ins) | 19500101 | 19701231
| | | Fresh snow depth (ins) | 19600101 | 19701231
|
| Total snow depth (cm) | 19500101 | current
| | | Fresh snow depth (cm) | 19600101 | 19821231
|
| Solar max in open air (degF) | 19601101 | 19711231
| | | Solar max in vacuo (degF) | 19601101 | 19711231
|
| Solar max in open air (degC) | 19601101 | 19771031
| | | Solar max in vacuo (degC) | 19601101 | 19771031
|
| state of ground
|
| State of ground (2 digit code) | 19600701 | 19780531
| | | State of ground (1 digit code) | 19780501 | 19811231
|
| State of ground (no snow) | 19820101 | current
| | | State of ground (ice/snow) | 19820101 | current
|
| sunshine
|
| Sunshine duration (h) | 19560101 | current
| | | Sunless day (0h) | 19560101 | current
|
| Sunny day (12h) | 19560101 | current
| | | Kipp-Zonen sunshine (h) | 20090101 | current
|
| Piche evaporation (ml) | 19601101 | current
| | | Tank evaporation (ins) | 19680401 | 19791231
|
| Tank evaporation (mm) | 19680401 | current
| | | Solar radiation (mWh/cm2) | 19730101 | 19880430
|
| Solar radiation (MJ/m2) | 19730101 | current
|