Monthly Report for December 2009

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Weather Summary
Measure Mean / Sum (anomaly) Min Max Mean Time
Minimum Temperature 1.6 °C (-1.6) -3.9 °C 9.3 °C 13:05
Maximum Temperature 5.8 °C (-2.0) 0.6 °C 12.3 °C 14:20
Mean Temperature 3.8 °C (-1.8) -1.7 °C 10.6 °C
Minimum Humidity 84% 66% 98% 12:20
Maximum Humidity 97% 90% 98% 10:15
Mean Humidity 92% 81% 98%
Minimum Pressure 1002 hPa 983 hPa 1032 hPa 14:17
Maximum Pressure 1009 hPa 989 hPa 1034 hPa 10:45
Mean Pressure 1005 hPa 986 hPa 1033 hPa
Mean Wind Speed 4.7 mph (-0.4) 1.5 mph 9.0 mph
Maximum Wind Speed 11.1 mph 4.3 mph 22.8 mph n/a
Maximum Gust 16.8 mph 6.2 mph 33.1 mph 10:26
Mean Wind Direction SSE N W
Rainfall 76.5 mm (137%) 0.0 mm 11.5 mm
Maximum Hourly Rain 1.6 mm 0.3 mm 4.4 mm 11:58
Maximum 10-min Rain 0.6 mm 0.3 mm 1.6 mm 12:06
Maximum Rain Rate 3.2 mm/h 0.6 mm/h 8 mm/h 13:26
Minimum Dew Point 0.2 °C -6.1 °C 8.9 °C 12:50
Maximum Dew Point 5.0 °C -0.8 °C 11.3 °C 12:47
Mean Dew Point 2.5 °C -3.8 °C 10.2 °C
Night Minimum (21-09) 2.3 °C -3.9 °C 9.4 °C n/a
Day Maximum (09-21) 5.7 °C 0.6 °C 11.6 °C n/a
Max 10m Temp Rise 0.4 °C 0.1 °C 1.3 °C 10:56
Max 1hr Temp Rise 1.0 °C 0.3 °C 2.2 °C 12:19
Max 1hr Hum Rise 4% 0% 12% 12:53
Max 10m Temp Fall 0.4 °C 0.1 °C 1.3 °C 12:32
Max 1hr Temp Fall 1.0 °C 0.3 °C 2.1 °C 14:37
Max 1hr Hum Fall 5% 0% 22% 11:31
Max 10m Wind Speed 8.1 mph 3.4 mph 16.0 mph 11:04
Minimum Feels-like -1.7 °C -9.7 °C 7.6 °C 11:20
Maximum Feels-like 6.0 °C 0.6 °C 14.0 °C 14:04
Mean Feels-like 2.3 °C -4.4 °C 11.9 °C n/a
Air-frost Hrs 95 hrs 0 hrs 20 hrs n/a
Measure Mean / Sum (anomaly) Min Max
Temperature Range 4.2 °C (-0.4) 1.5 °C 7.7 °C
Humidity Range 13% 0% 30%
Pressure Range 8 hPa 2 hPa 15 hPa
Measure Sum (anom.) [% of max] Min Max
Sun Hours 75 (156%) [34%] 0 7
Wet Hours 96 (155%) [13%] 0 15

NB: Hover over a value to view the date it was recorded.
    Sun hrs, Wet hrs, Cloud cover and Events are based on manual equipment/observations. Consequently, their reliablity is questionable and they         are provided for interest only.

Days Of...
Rainfall Temperature Sunshine Other
> 0.0 mm 24 Min < -5.0 °C 0 > 0 hrs 26 Falling Snow 0
> 0.1 mm 22 Min < 0.0 °C 9 > 1 hrs 21 Lying Snow 7
> 0.3 mm 20 Mean < 0.0 °C 5 > 3 hrs 8 Hail 0
> 1.0 mm 17 Mean > 20.0 °C 0 > 5 hrs 3 Thunder 0
> 5.0 mm 7 Max > 25.0 °C 0 > 10 hrs 0 Dense Fog 1
> 10.0 mm 2 Max > 30.0 °C 0 > 25% max poss. 21 Gusts > 30mph 2
> 20.0 mm 0 Ice Days 0 > 95% max poss. 1 Total Events 10

Misc.

Mean rainfall for days with >0.2mm: 3.8 mm
Total snowfall: 16 cm - 22% of the total precipitation
Total lying snow: 21 cm

Graphs and Charts

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View daily breakdown