Daily Report for 16th December 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.1 °C (-5.3) 06:32 3.4 °C (+0.0) 13.2 °C (+10.0), 2015 -2.3 °C (-5.5), 2010
Maximum Temperature 2.6 °C (-5.2) 23:51 8.0 °C (-0.3) 15.0 °C (+7.2), 2015 2.6 °C (-5.2), 2009
Mean Temperature 0.1 °C (-5.2) 5.8 °C (-0.2) 13.9 °C, 2015 0.1 °C, 2009
Minimum Humidity 86% 02:41 82% 88%, 2013 75%, 2017
Maximum Humidity 98% 19:21 97% 98%, 2009 81%, 2016
Mean Humidity 94% 91% 94%, 2013 80%, 2016
Minimum Pressure 1007 hPa 22:07 1008 hPa 1019 hPa, 2016 980 hPa, 2011
Maximum Pressure 1018 hPa 01:14 1016 hPa 1033 hPa, 2016 1001 hPa, 2012
Mean Pressure 1012 hPa 1012 hPa 1026 hPa, 2016 992 hPa, 2011
Mean Wind Speed 3.2 mph (-1.9) 4.3 mph (-0.8) 8.1 mph, 2013 0.6 mph, 2016
Maximum Wind Speed 8.7 mph 9.8 mph 19.7 mph, 2013 4.7 mph, 2016
Maximum Gust 13.0 mph 11:14 14.8 mph 29.9 mph, 2013 6.3 mph, 2016
Mean Wind Direction SW
Rainfall / Snow-melt approx. 3.5 mm 37.0 mm (128%) 8.8 mm, 2013
Maximum Hourly Rain 0.8 mm 19:25 4.6 mm, 2018
Maximum 10-min Rain 0.3 mm 19:25 2.2 mm, 2018
Maximum Rain Rate 1.9 mm/h 16:51 26 mm/h, 2018
Minimum Dew Point -3.5 °C 06:05 1.9 °C 11.1 °C, 2015 -5.6 °C, 2010
Maximum Dew Point 2.3 °C 23:51 7.1 °C 12.7 °C, 2015 2.3 °C, 2009
Mean Dew Point -0.8 °C 4.4 °C 12.0 °C, 2015 -0.8 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -2.1 °C 4.2 °C 12.6 °C, 2015 -2.1 °C, 2009
Day Maximum (09-21) 2.6 °C 7.7 °C 15.0 °C, 2015 2.6 °C, 2009
Max 10m Temp Rise 0.5 °C 03:03 0.4 °C 0.5 °C, 2009 0.1 °C, 2016
Max 1hr Temp Rise 0.8 °C 10:48 0.9 °C 1.6 °C, 2018 0.4 °C, 2016
Max 1hr Hum Rise 4% 04:06 4% 8%, 2017 1%, 2016
Max 10m Temp Fall 0.8 °C 03:18 0.4 °C 0.8 °C, 2009 0.2 °C, 2014
Max 1hr Temp Fall 1.1 °C 04:06 0.9 °C 2.4 °C, 2010 0.6 °C, 2014
Max 1hr Hum Fall 2% 01:01 6% 14%, 2010 2%, 2009
Max 10m Wind Speed 5.5 mph 11:32 7.5 mph 15.0 mph, 2013 3.1 mph, 2016
Minimum Feels-like -5.2 °C 08:53 0.7 °C 15.4 °C, 2015 -7.4 °C, 2010
Maximum Feels-like 2.6 °C 23:42 8.6 °C 17.6 °C, 2015 0.6 °C, 2011
Mean Feels-like -1.2 °C 5.0 °C 16.2 °C, 2015 -1.2 °C, 2009
Air-frost Hrs 10 hrs 0.6 hrs 10 hrs, 2009 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.7 °C (+0.1) 4.6 °C (-0.3) 8.7 °C (+4.1), 2010 1.8 °C (-2.8), 2015
Humidity Range 12% 15% 20%, 2011 3%, 2016
Pressure Range 11 hPa 8 hPa 26 hPa, 2010 4 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [4%]40 hrs (159%) [35%] 6.4 [91%], 2014 0 [0%], 2010
Wet Hours 11
[Mean rain rate: 0.3 mm/h]
44 hrs (136%) [11%] 11, 2009 0, 2016
Cloud Cover not available
Events Snowfall: ~4 cm
Air Frost
Comments Air frost;10-14 SLight Lying Snow; 15-23 Light Rain
Extra Comments 1330 Heavy Snow, occasional. Moderate at other times; ~15 Snow turned to sleet, Rain soon after; 2.7mm includes ~0.5mm snow melt
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

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


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Wind rose