Daily Report for 4th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (+0.4) 06:10 3.7 °C (+1.3) 9.5 °C (+7.2), 2011 -5.1 °C (-7.4), 2012
Maximum Temperature 8.9 °C (+1.7) 17:23 8.8 °C (+1.6) 13.3 °C (+6.1), 2016 1.4 °C (-5.8), 2012
Mean Temperature 6.8 °C (+1.1) 6.9 °C (+1.5) 11.0 °C, 2011 -1.5 °C, 2012
Minimum Humidity 86% 00:20 83% 86%, 2021 47%, 2013
Maximum Humidity 98% 09:14 96% 98%, 2010 85%, 2011
Mean Humidity 92% 90% 93%, 2010 68%, 2013
Minimum Pressure 1008 hPa 00:00 997 hPa 1024 hPa, 2012 987 hPa, 2014
Maximum Pressure 1011 hPa 09:09 1006 hPa 1039 hPa, 2012 998 hPa, 2009
Mean Pressure 1009 hPa 1000 hPa 1032 hPa, 2012 996 hPa, 2009
Mean Wind Speed 2.7 mph (-2.4) 3.9 mph (-1.2) 11.8 mph, 2011 1.7 mph, 2017
Maximum Wind Speed 8.4 mph 10:12 11.4 mph 25.5 mph, 2011 8.4 mph, 2021
Maximum Gust 12.5 mph 10:12 16.8 mph 35.6 mph, 2011 12.5 mph, 2021
Mean Wind Direction S
Rainfall 12.0 mm 17.9 mm (306%) 12.0 mm, 2021
Maximum Hourly Rain 6.2 mm 21:22 6.2 mm, 2021
Maximum 10-min Rain 1.5 mm 20:52 1.5 mm, 2021
Maximum Rain Rate 14 mm/h 20:47 14 mm/h, 2021
Minimum Dew Point 1.7 °C 05:56 2.3 °C 5.5 °C, 2011 -8.7 °C, 2012
Maximum Dew Point 8.0 °C 16:23 7.2 °C 9.4 °C, 2016 -0.7 °C, 2012
Mean Dew Point 5.7 °C 5.3 °C 7.0 °C, 2011 -5.3 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.8 °C 06:11 4.4 °C 8.6 °C, 2013 -5.1 °C, 2012
Day Maximum (09-21) 8.9 °C 17:31 8.8 °C 13.3 °C, 2016 1.4 °C, 2012
Max 10m Temp Rise 0.8 °C 08:57 0.4 °C 1.1 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 2.7 °C 09:23 1.5 °C 2.7 °C, 2012 0.6 °C, 2011
Max 1hr Hum Rise 5% 13:24 4% 10%, 2009 2%, 2010
Max 10m Temp Fall 0.3 °C 21:30 0.2 °C 1.5 °C, 2009 0.1 °C, 2011
Max 1hr Temp Fall 1.3 °C 05:56 0.8 °C 1.9 °C, 2009 0.4 °C, 2011
Max 1hr Hum Fall 7% 11:14 6% 29%, 2013 3%, 2019
Max 10m Wind Speed 6.0 mph 21:02 8.8 mph 16.2 mph, 2011 6.0 mph, 2021
Minimum Feels-like 0.4 °C 06:45 0.3 °C 5.3 °C, 2011 -7.4 °C, 2012
Maximum Feels-like 9.2 °C 17:28 9.1 °C 14.0 °C, 2016 1.1 °C, 2012
Mean Feels-like 5.6 °C 5.7 °C 10.9 °C, 2011 -3.6 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 15 hrs, 2012 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.1 °C (+1.3) 5.1 °C (+0.3) 9.1 °C (+4.3), 2016 2.1 °C (-2.7), 2010
Humidity Range 12% 13% 42%, 2013 12%, 2019
Pressure Range 4 hPa 9 hPa 21 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]1 hrs (10%) [3%] 6.7 [81%], 2009 0 [0%], 2019
Wet Hours 7
[Mean rain rate: 1.7 mm/h]
14 hrs (188%) [15%] 8, 2019 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
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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