Daily Report for 9th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.3 °C (+0.3) 06:55 2.0 °C (-0.8) 8.5 °C (+5.5), 2017 1.1 °C (-1.9), 2010
Maximum Temperature 12.7 °C (+3.0) 14:52 7.4 °C (-1.9) 19.3 °C (+9.7), 2014 6.8 °C (-2.9), 2010
Mean Temperature 7.8 °C (+1.7) 4.7 °C (-1.4) 13.3 °C, 2014 4.1 °C, 2010
Minimum Humidity 48% 14:45 68% 86%, 2013 35%, 2014
Maximum Humidity 83% 06:58 91% 98%, 2013 69%, 2014
Mean Humidity 69% 81% 94%, 2013 52%, 2014
Minimum Pressure 1018 hPa 23:52 1026 hPa 1034 hPa, 2012 987 hPa, 2016
Maximum Pressure 1023 hPa 00:00 1031 hPa 1036 hPa, 2012 1005 hPa, 2013
Mean Pressure 1021 hPa 1029 hPa 1035 hPa, 2012 996 hPa, 2016
Mean Wind Speed 5.3 mph (+0.1) 2.3 mph (-2.9) 8.3 mph, 2019 3.0 mph, 2013
Maximum Wind Speed 12.7 mph 22:35 9.8 mph 21.9 mph, 2019 9.2 mph, 2013
Maximum Gust 19.4 mph 22:53 14.4 mph 39.2 mph, 2019 13.2 mph, 2013
Mean Wind Direction WNW
Rainfall 0.0 mm 6.7 mm (55%) 13.9 mm, 2016
Maximum Hourly Rain n/a 3.7, 2016
Maximum 10-min Rain n/a 0.9, 2016
Maximum Rain Rate n/a 24, 2016
Minimum Dew Point 0.6 °C 06:24 -0.5 °C 4.5 °C, 2016 -2.8 °C, 2009
Maximum Dew Point 3.8 °C 16:03 3.2 °C 9.5 °C, 2018 2.1 °C, 2009
Mean Dew Point 2.4 °C 1.5 °C 6.0 °C, 2016 0.0 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.3 °C 06:56 2.0 °C 9.5 °C, 2017 1.1 °C, 2010
Day Maximum (09-21) 12.7 °C 14:52 7.4 °C 19.3 °C, 2014 6.4 °C, 2013
Max 10m Temp Rise 0.5 °C 07:33 0.4 °C 1.0 °C, 2015 0.2 °C, 2013
Max 1hr Temp Rise 2.1 °C 08:26 1.3 °C 3.8 °C, 2015 0.4 °C, 2013
Max 1hr Hum Rise 9% 20:00 6% 18%, 2020 2%, 2013
Max 10m Temp Fall 0.3 °C 20:11 0.3 °C 0.6 °C, 2017 0.2 °C, 2010
Max 1hr Temp Fall 1.5 °C 20:49 1.3 °C 2.8 °C, 2020 0.6 °C, 2010
Max 1hr Hum Fall 9% 14:34 8% 18%, 2019 3%, 2012
Max 10m Wind Speed 10.3 mph 23:02 6.8 mph 19.1 mph, 2019 6.7 mph, 2013
Minimum Feels-like 0.5 °C 06:28 -0.9 °C 7.0 °C, 2014 -3.0 °C, 2010
Maximum Feels-like 12.7 °C 14:38 7.3 °C 19.3 °C, 2014 6.8 °C, 2010
Mean Feels-like 6.1 °C 3.4 °C 13.2 °C, 2014 2.1 °C, 2010
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 9.4 °C (+2.8) 5.4 °C (-1.1) 10.9 °C (+4.3), 2014 3.8 °C (-2.8), 2016
Humidity Range 35% 23% 48%, 2019 9%, 2016
Pressure Range 5 hPa 5 hPa 22 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [98%]25 hrs (86%) [28%] 10.2 [100%], 2014 0 [0%], 2012
Wet Hours 05 hrs (32%) [2.3%] 11, 2016 , 2009
Cloud Cover Sunny
Events Maximum possible sunshine
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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Wind rose