Daily Report for 20th December 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -3.3 °C (-6.3) 09:28 2.2 °C (-1.1) 9.4 °C (+6.4), 2015 -7.2 °C (-10.2), 2010
Maximum Temperature 1.1 °C (-6.4) 14:29 6.7 °C (-1.5) 14.6 °C (+7.1), 2015 0.3 °C (-7.2), 2010
Mean Temperature -0.4 °C (-6.4) 4.6 °C (-1.3) 12.2 °C, 2015 -3.2 °C, 2010
Minimum Humidity 73% 14:22 81% 96%, 2012 62%, 2014
Maximum Humidity 97% 03:15 97% 98%, 2012 80%, 2016
Mean Humidity 84% 90% 98%, 2012 75%, 2014
Minimum Pressure 997 hPa 19:44 1007 hPa 1034 hPa, 2017 977 hPa, 2019
Maximum Pressure 1000 hPa 00:07 1015 hPa 1036 hPa, 2017 988 hPa, 2019
Mean Pressure 998 hPa 1011 hPa 1035 hPa, 2017 982 hPa, 2019
Mean Wind Speed 4.9 mph (-0.2) 4.7 mph (-0.4) 8.1 mph, 2015 2.6 mph, 2016
Maximum Wind Speed 10.7 mph 11.2 mph 20.1 mph, 2013 8.6 mph, 2017
Maximum Gust 15.2 mph 05:02 16.7 mph 30.8 mph, 2013 11.5 mph, 2017
Mean Wind Direction SW
Rainfall / Snow-melt approx. 2.0 mm 44.0 mm (122%) 21.7 mm, 2012
Maximum Hourly Rain n/a 4.1, 2012
Maximum 10-min Rain n/a 1.2, 2012
Maximum Rain Rate n/a 9, 2012
Minimum Dew Point -6.1 °C 09:57 0.5 °C 6.5 °C, 2015 -9.3 °C, 2010
Maximum Dew Point 0.2 °C 03:15 5.8 °C 9.7 °C, 2017 -0.4 °C, 2010
Mean Dew Point -2.8 °C 3.1 °C 8.4 °C, 2017 -4.7 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -3.3 °C 3.0 °C 12.3 °C, 2015 -7.2 °C, 2010
Day Maximum (09-21) 1.1 °C 6.5 °C 13.0 °C, 2015 0.3 °C, 2010
Max 10m Temp Rise 0.7 °C 12:14 0.4 °C 0.7 °C, 2009 0.2 °C, 2012
Max 1hr Temp Rise 2.1 °C 13:03 0.9 °C 2.1 °C, 2009 0.5 °C, 2015
Max 1hr Hum Rise 4% 01:19 4% 8%, 2018 1%, 2012
Max 10m Temp Fall 0.5 °C 07:19 0.4 °C 0.5 °C, 2009 0.1 °C, 2017
Max 1hr Temp Fall 1.4 °C 07:20 0.9 °C 1.7 °C, 2015 0.1 °C, 2017
Max 1hr Hum Fall 6% 10:02 6% 9%, 2013 2%, 2012
Max 10m Wind Speed 7.0 mph 12:52 7.9 mph 15.5 mph, 2013 6.2 mph, 2010
Minimum Feels-like -8.3 °C 09:57 -1.1 °C 5.7 °C, 2015 -10.2 °C, 2010
Maximum Feels-like 1.1 °C 14:09 7.2 °C 15.5 °C, 2015 0.3 °C, 2010
Mean Feels-like -3.0 °C 3.3 °C 12.5 °C, 2015 -5.0 °C, 2010
Air-frost Hrs 12 hrs 3 hrs 17 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.4 °C (-0.1) 4.4 °C (-0.4) 7.9 °C (+3.4), 2013 2.3 °C (-2.2), 2016
Humidity Range 24% 16% 29%, 2011 2%, 2012
Pressure Range 3 hPa 8 hPa 13 hPa, 2012 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [100%]59 hrs (191%) [42%] 7 [100%], 2009 0 [0%], 2012
Wet Hours 2
[Mean rain rate: 1.0 mm/h]
53 hrs (131%) [11%] 16, 2012 0, 2013
Cloud Cover not available
Events Snowfall: ~2 cm
Lying Snow (at 09z): ~3 cm
Air Frost
Maximum possible sunshine
Comments 00-02 Moderate Lying Snow: 3cm
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs, Wet hrs, Cloud cover and Events are based on manual equipment/observations (entered with a delay of 1-10 days); their reliablity is questionable and they are provided for interest only.
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Daily Graph of Conditions

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Wind rose