Daily Report for 10th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.5 °C (+3.4) 01:14 2.5 °C (-0.4) 10.2 °C (+7.1), 2020 0.6 °C (-2.5), 2013
Maximum Temperature 10.9 °C (+1.2) 23:52 7.8 °C (-1.6) 15.2 °C (+5.5), 2020 3.0 °C (-6.7), 2013
Mean Temperature 7.9 °C (+2.3) 5.0 °C (-1.0) 12.6 °C, 2020 1.9 °C, 2013
Minimum Humidity 80% 00:10 69% 82%, 2018 40%, 2019
Maximum Humidity 93% 21:26 91% 97%, 2009 77%, 2010
Mean Humidity 86% 81% 89%, 2018 67%, 2015
Minimum Pressure 995 hPa 23:41 1023 hPa 1035 hPa, 2012 994 hPa, 2018
Maximum Pressure 1018 hPa 00:10 1030 hPa 1039 hPa, 2012 998 hPa, 2018
Mean Pressure 1008 hPa 1027 hPa 1037 hPa, 2012 996 hPa, 2018
Mean Wind Speed 12.8 mph (+7.6) 3.4 mph (-1.8) 12.8 mph, 2021 2.6 mph, 2016
Maximum Wind Speed 22.5 mph 19:36 11.1 mph 29.0 mph, 2019 8.5 mph, 2016
Maximum Gust 35.4 mph 17:22 16.5 mph 47.2 mph, 2019 13.0 mph, 2015
Mean Wind Direction SW
Rainfall 3.1 mm 9.8 mm (72%) 9.7 mm, 2019
Maximum Hourly Rain 1.0 mm 11:27 3.5 mm, 2019
Maximum 10-min Rain 0.3 mm 13:25 1.1 mm, 2019
Maximum Rain Rate 1.2 mm/h 11:10 7 mm/h, 2019
Minimum Dew Point 3.3 °C 00:04 -0.1 °C 8.1 °C, 2020 -3.4 °C, 2019
Maximum Dew Point 9.2 °C 22:15 3.8 °C 11.9 °C, 2020 -0.1 °C, 2010
Mean Dew Point 5.8 °C 1.9 °C 10.3 °C, 2020 -1.4 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.4 °C * 22:41 2.4 °C 8.7 °C, 2012 1.9 °C, 2013
Day Maximum (09-21) * 9.8 °C * 20:56 7.7 °C 15.2 °C, 2020 3.0 °C, 2013
Max 10m Temp Rise 0.2 °C 18:20 0.4 °C 0.9 °C, 2019 0.1 °C, 2013
Max 1hr Temp Rise 0.7 °C 19:56 1.2 °C 2.7 °C, 2014 0.4 °C, 2013
Max 1hr Hum Rise 4% 11:03 6% 30%, 2019 3%, 2010
Max 10m Temp Fall 0.2 °C 06:54 0.3 °C 1.7 °C, 2019 0.2 °C, 2010
Max 1hr Temp Fall 0.4 °C 06:54 1.2 °C 4.6 °C, 2019 0.4 °C, 2021
Max 1hr Hum Fall 5% 23:15 7% 22%, 2019 2%, 2010
Max 10m Wind Speed 18.1 mph 17:25 8.0 mph 20.3 mph, 2019 6.3 mph, 2016
Minimum Feels-like 1.7 °C 13:07 -0.7 °C 10.9 °C, 2020 -7.2 °C, 2013
Maximum Feels-like 11.6 °C 23:48 7.8 °C 17.1 °C, 2020 0.5 °C, 2013
Mean Feels-like 4.4 °C 3.5 °C 14.0 °C, 2020 -2.5 °C, 2013
Air-frost Hrs 0 hrs 0.3 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.4 °C (-2.2) 5.3 °C (-1.2) 8.0 °C (+1.4), 2009 2.4 °C (-4.2), 2013
Humidity Range 13% 22% 57%, 2019 10%, 2010
Pressure Range 23 hPa 7 hPa 23 hPa, 2021 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]25 hrs (77%) [25%] 9 [87%], 2015 0 [0%], 2013
Wet Hours 7
[Mean rain rate: 0.4 mm/h]
12 hrs (70%) [5%] 9, 2019 , 2009
Cloud Cover Overcast
Events None
Comments rn
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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