Daily Report for 6th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.6 °C (-2.1) 03:49 2.5 °C (-0.2) 8.7 °C (+5.9), 2019 -1.3 °C (-4.0), 2010
Maximum Temperature 5.8 °C (-3.6) 11:43 6.5 °C (-2.7) 13.5 °C (+4.1), 2013 5.8 °C (-3.6), 2021
Mean Temperature 3.5 °C (-2.9) 4.5 °C (-1.4) 10.4 °C, 2019 3.1 °C, 2016
Minimum Humidity 60% 11:10 74% 80%, 2019 45%, 2009
Maximum Humidity 88% 04:41 93% 92%, 2009 69%, 2015
Mean Humidity 76% 85% 86%, 2019 60%, 2015
Minimum Pressure 1032 hPa 23:44 1029 hPa 1032 hPa, 2021 986 hPa, 2019
Maximum Pressure 1036 hPa 08:20 1033 hPa 1036 hPa, 2021 992 hPa, 2018
Mean Pressure 1035 hPa 1031 hPa 1035 hPa, 2021 989 hPa, 2018
Mean Wind Speed 1.1 mph (-4.1) 2.2 mph (-3.0) 9.6 mph, 2019 1.1 mph, 2021
Maximum Wind Speed 8.8 mph 10:25 9.9 mph 21.4 mph, 2019 8.8 mph, 2021
Maximum Gust 11.4 mph 09:35 14.4 mph 31.1 mph, 2019 11.4 mph, 2021
Mean Wind Direction ENE
Rainfall 0.0 mm 6.7 mm (82%) 3.5 mm, 2019
Maximum Hourly Rain n/a 1.1, 2019
Maximum 10-min Rain n/a 0.4, 2016
Maximum Rain Rate n/a 2.7, 2016
Minimum Dew Point -1.8 °C 10:52 0.2 °C 5.8 °C, 2019 -6.5 °C, 2010
Maximum Dew Point 0.7 °C 09:11 3.6 °C 9.6 °C, 2019 0.7 °C, 2009
Mean Dew Point -0.5 °C 2.0 °C 8.1 °C, 2019 -1.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.6 °C 03:49 2.5 °C 8.8 °C, 2019 0.2 °C, 2009
Day Maximum (09-21) 5.8 °C 11:37 6.5 °C 13.5 °C, 2013 5.8 °C, 2021
Max 10m Temp Rise 0.4 °C 09:20 0.4 °C 0.6 °C, 2013 0.3 °C, 2010
Max 1hr Temp Rise 1.6 °C 10:01 1.1 °C 2.2 °C, 2014 0.9 °C, 2011
Max 1hr Hum Rise 9% 20:58 5% 13%, 2016 3%, 2011
Max 10m Temp Fall 0.4 °C 23:52 0.3 °C 1.1 °C, 2016 0.2 °C, 2017
Max 1hr Temp Fall 1.0 °C 23:58 1.1 °C 2.7 °C, 2016 0.8 °C, 2017
Max 1hr Hum Fall 13% 10:11 7% 15%, 2018 5%, 2019
Max 10m Wind Speed 5.5 mph 13:56 6.5 mph 14.9 mph, 2019 5.5 mph, 2021
Minimum Feels-like -0.5 °C 02:17 -0.6 °C 5.7 °C, 2013 -4.4 °C, 2010
Maximum Feels-like 5.7 °C 11:24 6.4 °C 13.5 °C, 2013 5.6 °C, 2011
Mean Feels-like 2.7 °C 3.0 °C 9.7 °C, 2019 0.4 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 3 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.2 °C (-1.4) 3.9 °C (-2.5) 10.4 °C (+3.8), 2009 3.2 °C (-3.4), 2011
Humidity Range 28% 19% 47%, 2009 11%, 2019
Pressure Range 5 hPa 5 hPa 17 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]9 hrs (47%) [15%] 9.2 [92%], 2009 0 [0%], 2019
Wet Hours 05 hrs (49%) [3.5%] 6, 2019 , 2009
Cloud Cover Overcast with periods of Mostly Cloudy
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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