Daily Report for 17th December 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.9 °C (-4.0) 21:27 3.2 °C (-0.2) 11.8 °C (+8.7), 2015 -6.0 °C (-9.1), 2010
Maximum Temperature 3.4 °C (-4.3) 13:08 7.7 °C (-0.6) 15.2 °C (+7.5), 2015 -0.8 °C (-8.5), 2010
Mean Temperature 1.5 °C (-4.2) 5.5 °C (-0.4) 13.6 °C, 2015 -3.0 °C, 2010
Minimum Humidity 72% 19:16 81% 92%, 2013 67%, 2015
Maximum Humidity 98% 02:43 97% 98%, 2009 84%, 2016
Mean Humidity 89% 91% 96%, 2013 79%, 2015
Minimum Pressure 1006 hPa 00:23 1008 hPa 1034 hPa, 2016 995 hPa, 2010
Maximum Pressure 1010 hPa 13:32 1016 hPa 1041 hPa, 2016 1002 hPa, 2010
Mean Pressure 1008 hPa 1012 hPa 1038 hPa, 2016 998 hPa, 2010
Mean Wind Speed 9.0 mph (+3.9) 4.6 mph (-0.5) 9.0 mph, 2009 0.7 mph, 2016
Maximum Wind Speed 22.8 mph 10.6 mph 22.8 mph, 2009 4.6 mph, 2016
Maximum Gust 33.1 mph 23:12 15.8 mph 33.1 mph, 2009 6.3 mph, 2016
Mean Wind Direction N
Rainfall / Snow-melt approx. 2.0 mm 39.0 mm (127%) 6.1 mm, 2013
Maximum Hourly Rain 2.0 mm 01:01 2.1 mm, 2014
Maximum 10-min Rain n/a 00:52 0.7, 2013
Maximum Rain Rate n/a 3.6, 2014
Minimum Dew Point -4.2 °C 19:47 1.5 °C 8.3 °C, 2015 -8.0 °C, 2010
Maximum Dew Point 2.9 °C 01:31 6.9 °C 12.4 °C, 2015 -3.8 °C, 2010
Mean Dew Point -0.1 °C 4.1 °C 10.0 °C, 2015 -5.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 1.0 °C * 4.1 °C 12.7 °C, 2015 -3.3 °C, 2010
Day Maximum (09-21) 3.4 °C 7.5 °C 15.2 °C, 2015 -0.8 °C, 2010
Max 10m Temp Rise 0.3 °C 22:00 0.4 °C 0.6 °C, 2016 0.2 °C, 2010
Max 1hr Temp Rise 1.0 °C 22:37 0.9 °C 1.7 °C, 2018 0.5 °C, 2019
Max 1hr Hum Rise 12% 21:08 5% 12%, 2009 2%, 2013
Max 10m Temp Fall 0.4 °C 20:36 0.4 °C 0.5 °C, 2010 0.1 °C, 2014
Max 1hr Temp Fall 1.2 °C 14:24 0.9 °C 1.6 °C, 2010 0.3 °C, 2014
Max 1hr Hum Fall 9% 13:15 6% 12%, 2017 2%, 2016
Max 10m Wind Speed 15.1 mph 23:33 8.0 mph 15.1 mph, 2009 3.5 mph, 2016
Minimum Feels-like -8.1 °C 22:11 0.2 °C 13.0 °C, 2015 -9.0 °C, 2010
Maximum Feels-like 3.4 °C 13:04 8.3 °C 16.9 °C, 2015 -0.8 °C, 2010
Mean Feels-like -2.6 °C 4.6 °C 14.9 °C, 2015 -5.7 °C, 2010
Air-frost Hrs 2 hrs 0.7 hrs 24 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.3 °C (-0.3) 4.6 °C (-0.3) 9.2 °C (+4.6), 2017 1.6 °C (-3.0), 2019
Humidity Range 26% 16% 26%, 2009 4%, 2019
Pressure Range 4 hPa 8 hPa 11 hPa, 2018 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [29%]42 hrs (158%) [35%] 6 [86%], 2012 0 [0%], 2016
Wet Hours 3
[Mean rain rate: 0.7 mm/h]
47 hrs (137%) [11%] 12, 2019 0, 2016
Cloud Cover not available
Events Snowfall: ~2 cm
Lying Snow (at 09z): ~1 cm
Comments 13-15 Moderate Snow Showers; 20-22 Moderate Lying Snoww
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