Daily Report for 2nd December 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.3 °C (-1.3) 07:01 2.7 °C (-0.9) 11.9 °C (+8.3), 2015 -1.8 °C (-5.4), 2010
Maximum Temperature 6.7 °C (-2.1) 17:15 7.1 °C (-1.8) 14.8 °C (+6.0), 2018 -0.7 °C (-9.5), 2010
Mean Temperature 5.0 °C (-1.7) 5.1 °C (-1.3) 13.4 °C, 2018 -1.3 °C, 2010
Minimum Humidity 81% 13:51 80% 86%, 2009 61%, 2012
Maximum Humidity 93% 21:30 91% 98%, 2009 82%, 2015
Mean Humidity 88% 85% 95%, 2009 74%, 2015
Minimum Pressure 1009 hPa 23:54 1016 hPa 1030 hPa, 2013 993 hPa, 2009
Maximum Pressure 1026 hPa 00:00 1027 hPa 1035 hPa, 2013 999 hPa, 2018
Mean Pressure 1018 hPa 1022 hPa 1033 hPa, 2013 998 hPa, 2018
Mean Wind Speed 1.0 mph (-4.1) 2.7 mph (-2.4) 8.1 mph, 2015 0.7 mph, 2016
Maximum Wind Speed 7.3 mph 17:49 9.7 mph 18.5 mph, 2014 5.5 mph, 2016
Maximum Gust 9.1 mph 13:41 14.2 mph 30.6 mph, 2014 8.1 mph, 2013
Mean Wind Direction WNW
Rainfall 0.0 mm 0.0 mm (0%) 10.9 mm, 2009
Maximum Hourly Rain n/a 4.4, 2009
Maximum 10-min Rain n/a 1.6, 2009
Maximum Rain Rate n/a 2.6, 2018
Minimum Dew Point 0.5 °C 06:51 0.8 °C 10.3 °C, 2018 -5.4 °C, 2010
Maximum Dew Point 5.3 °C 20:09 4.8 °C 12.3 °C, 2018 -2.7 °C, 2010
Mean Dew Point 3.1 °C 2.8 °C 11.7 °C, 2018 -3.5 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.3 °C 07:02 3.1 °C 11.9 °C, 2015 -1.8 °C, 2010
Day Maximum (09-21) 6.7 °C 17:14 7.1 °C 14.8 °C, 2018 -0.7 °C, 2010
Max 10m Temp Rise 0.3 °C 08:28 0.3 °C 0.5 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 1.0 °C 08:47 1.2 °C 1.5 °C, 2011 0.5 °C, 2010
Max 1hr Hum Rise 6% 15:10 5% 9%, 2017 4%, 2010
Max 10m Temp Fall 0.3 °C 06:10 0.3 °C 0.7 °C, 2009 0.1 °C, 2015
Max 1hr Temp Fall 1.0 °C 06:41 1.1 °C 1.8 °C, 2012 0.4 °C, 2015
Max 1hr Hum Fall 4% 09:29 4% 14%, 2012 2%, 2016
Max 10m Wind Speed 6.4 mph 14:10 7.7 mph 14.0 mph, 2014 3.7 mph, 2013
Minimum Feels-like 0.8 °C 06:49 0.2 °C 12.8 °C, 2018 -8.7 °C, 2010
Maximum Feels-like 6.7 °C 17:20 6.5 °C 17.0 °C, 2018 -1.7 °C, 2010
Mean Feels-like 4.4 °C 3.6 °C 15.6 °C, 2018 -5.8 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 24 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.4 °C (-0.8) 4.4 °C (-0.9) 5.5 °C (+0.3), 2012 1.1 °C (-4.1), 2010
Humidity Range 12% 11% 26%, 2012 7%, 2016
Pressure Range 17 hPa 10 hPa 17 hPa, 2020 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.4 [6%]7.4 hrs (196%) [51%] 7.3 [101%], 2019 0 [0%], 2010
Wet Hours 00 hrs (0%) [0%] 7, 2009 0, 2012
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments -
Extra Comments
Issues wind from harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 6.5 °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 are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose