Monthly Report for December 2009
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| Weather Summary | ||||
| Measure | Mean / Sum (anomaly) | Min | Max | Mean Time |
| Minimum Temperature | 1.6 °C (-2.0) | -3.9 °C | 9.3 °C | 13:05 |
| Maximum Temperature | 5.8 °C (-2.4) | 0.6 °C | 12.3 °C | 14:20 |
| Mean Temperature | 3.8 °C (-2.2) | -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 (134%) | 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 (115%) [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 (entered with a delay of 1-10 days).
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 >0.3mm: 3.8 mmTotal snowfall: 16 cm - 22% of the total precipitation
Total lying snow: 21 cm