Daily Report for 1st February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.6 °C (+0.2) 08:05 2.6 °C (+0.2) 9.5 °C (+7.2), 2016 -2.5 °C (-4.8), 2009
Maximum Temperature 4.0 °C (-3.1) 23:20 4.0 °C (-3.1) 13.9 °C (+6.8), 2016 1.9 °C (-5.2), 2019
Mean Temperature 3.3 °C (-1.4) 3.3 °C (-1.4) 12.2 °C, 2016 0.1 °C, 2009
Minimum Humidity 87% 19:19 87% 88%, 2019 43%, 2012
Maximum Humidity 96% 01:19 96% 98%, 2014 79%, 2012
Mean Humidity 92% 92% 93%, 2019 64%, 2009
Minimum Pressure 992 hPa 00:33 992 hPa 1029 hPa, 2012 982 hPa, 2014
Maximum Pressure 1003 hPa 18:08 1003 hPa 1035 hPa, 2012 996 hPa, 2014
Mean Pressure 998 hPa 998 hPa 1032 hPa, 2012 989 hPa, 2019
Mean Wind Speed 1.6 mph (-3.5) 1.6 mph (-3.5) 12.3 mph, 2016 1.6 mph, 2021
Maximum Wind Speed 7.5 mph 23:49 7.5 mph 25.3 mph, 2016 7.5 mph, 2021
Maximum Gust 11.4 mph 01:24 11.4 mph 38.0 mph, 2020 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 0.2 mm 0.2 mm (14%) 13.2 mm, 2019
Maximum Hourly Rain 0.2 mm 3.7 mm, 2014
Maximum 10-min Rain 0.2 mm 2.4 mm, 2014
Maximum Rain Rate n/a 48, 2014
Minimum Dew Point 1.2 °C 17:16 1.2 °C 6.5 °C, 2017 -9.5 °C, 2009
Maximum Dew Point 2.9 °C 01:30 2.9 °C 10.0 °C, 2016 -3.0 °C, 2012
Mean Dew Point 2.1 °C 2.1 °C 8.2 °C, 2017 -6.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.6 °C 08:05 2.6 °C 11.6 °C, 2016 -1.7 °C, 2011
Day Maximum (09-21) * 3.8 °C * 16:29 3.8 °C 13.9 °C, 2016 1.9 °C, 2019
Max 10m Temp Rise 0.2 °C 10:43 0.2 °C 0.3 °C, 2010 0.2 °C, 2016
Max 1hr Temp Rise 0.8 °C 11:26 0.8 °C 1.3 °C, 2012 0.6 °C, 2016
Max 1hr Hum Rise 3% 23:36 3% 20%, 2015 1%, 2017
Max 10m Temp Fall 0.2 °C 05:32 0.2 °C 1.0 °C, 2018 0.1 °C, 2017
Max 1hr Temp Fall 0.4 °C 16:18 0.4 °C 2.2 °C, 2014 0.4 °C, 2017
Max 1hr Hum Fall 4% 12:18 4% 15%, 2012 1%, 2017
Max 10m Wind Speed 5.7 mph 23:55 5.7 mph 18.8 mph, 2016 5.7 mph, 2021
Minimum Feels-like -1.0 °C 05:18 -1.0 °C 6.3 °C, 2017 -8.0 °C, 2011
Maximum Feels-like 4.0 °C 23:20 4.0 °C 14.7 °C, 2016 -0.5 °C, 2012
Mean Feels-like 2.0 °C 2.0 °C 12.6 °C, 2016 -4.5 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 10 hrs, 2012 0 hrs, 2013
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.4 °C (-3.3) 1.4 °C (-3.3) 8.6 °C (+3.9), 2011 1.4 °C (-3.3), 2021
Humidity Range 9% 9% 41%, 2014 4%, 2017
Pressure Range 12 hPa 12 hPa 14 hPa, 2013 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]0 hrs (0%) [0%] 7 [86%], 2010 0 [0%], 2017
Wet Hours 11 hrs (54%) [4.2%] 20, 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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