Daily Report for 3rd December 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.8 °C (-1.8) 02:53 1.4 °C (-2.3) 11.9 °C (+8.3), 2015 -4.7 °C (-8.3), 2010
Maximum Temperature 8.5 °C (-0.3) 14:35 7.0 °C (-1.9) 13.6 °C (+4.8), 2018 1.5 °C (-7.3), 2010
Mean Temperature 5.1 °C (-1.1) 3.9 °C (-2.1) 12.6 °C, 2015 -2.7 °C, 2010
Minimum Humidity 73% 15:19 76% 89%, 2020 54%, 2016
Maximum Humidity 92% 03:23 93% 98%, 2009 80%, 2016
Mean Humidity 85% 86% 93%, 2017 70%, 2016
Minimum Pressure 1024 hPa 23:58 1025 hPa 1027 hPa, 2013 976 hPa, 2020
Maximum Pressure 1032 hPa 00:11 1032 hPa 1032 hPa, 2019 1002 hPa, 2009
Mean Pressure 1028 hPa 1028 hPa 1029 hPa, 2013 990 hPa, 2020
Mean Wind Speed 3.2 mph (-1.9) 4.0 mph (-1.1) 8.9 mph, 2015 2.3 mph, 2013
Maximum Wind Speed 9.8 mph 12:13 10.1 mph 19.4 mph, 2015 7.1 mph, 2017
Maximum Gust 15.0 mph 13:49 16.2 mph 27.9 mph, 2015 10.4 mph, 2017
Mean Wind Direction SW
Rainfall 0.0 mm 0.0 mm (0%) 15.4 mm, 2020
Maximum Hourly Rain n/a 3.1, 2020
Maximum 10-min Rain n/a 2, 2015
Maximum Rain Rate n/a 54, 2015
Minimum Dew Point 0.4 °C 02:29 -0.5 °C 7.7 °C, 2015 -6.2 °C, 2010
Maximum Dew Point 5.0 °C 13:30 3.8 °C 11.3 °C, 2015 -0.6 °C, 2010
Mean Dew Point 2.8 °C 1.8 °C 9.4 °C, 2015 -4.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.8 °C 02:53 1.7 °C 12.7 °C, 2015 -4.7 °C, 2010
Day Maximum (09-21) 8.5 °C 14:39 7.0 °C 13.6 °C, 2018 -1.9 °C, 2010
Max 10m Temp Rise 0.3 °C 10:17 0.5 °C 0.4 °C, 2012 0.1 °C, 2013
Max 1hr Temp Rise 1.3 °C 10:54 1.6 °C 1.6 °C, 2014 0.3 °C, 2009
Max 1hr Hum Rise 5% 16:28 4% 14%, 2014 1%, 2013
Max 10m Temp Fall 0.3 °C 22:48 0.3 °C 0.7 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 1.1 °C 23:12 1.1 °C 2.2 °C, 2018 0.5 °C, 2013
Max 1hr Hum Fall 4% 12:09 5% 19%, 2012 3%, 2010
Max 10m Wind Speed 7.7 mph 13:55 7.9 mph 15.9 mph, 2015 5.0 mph, 2017
Minimum Feels-like -1.9 °C 01:07 -3.4 °C 12.6 °C, 2015 -9.7 °C, 2010
Maximum Feels-like 7.7 °C 14:17 6.2 °C 15.3 °C, 2018 0.1 °C, 2010
Mean Feels-like 3.5 °C 1.6 °C 13.6 °C, 2015 -5.7 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 22 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (+1.5) 5.6 °C (+0.4) 8.7 °C (+3.5), 2018 1.2 °C (-4.0), 2015
Humidity Range 19% 16% 38%, 2011 6%, 2020
Pressure Range 8 hPa 7 hPa 34 hPa, 2020 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.5 [76%]15 hrs (261%) [68%] 5.5 [76%], 2019 0 [0%], 2009
Wet Hours 00 hrs (0%) [0%] 12, 2020 0, 2010
Cloud Cover Mostly Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.5 °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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