Daily Report for 26th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.0 °C (+0.8) 23:36 3.7 °C (+0.3) 7.9 °C (+3.7), 2016 -0.2 °C (-4.4), 2013
Maximum Temperature 12.2 °C (+1.0) 12:33 9.9 °C (-0.2) 17.8 °C (+6.6), 2012 1.3 °C (-9.9), 2013
Mean Temperature 9.0 °C (+0.9) 6.9 °C (+0.0) 10.2 °C, 2009 0.7 °C, 2013
Minimum Humidity 71% 12:29 67% 71%, 2021 29%, 2020
Maximum Humidity 88% 13:55 90% 98%, 2014 73%, 2013
Mean Humidity 81% 80% 84%, 2014 60%, 2017
Minimum Pressure 1009 hPa 12:32 1019 hPa 1036 hPa, 2012 995 hPa, 2016
Maximum Pressure 1016 hPa 00:00 1026 hPa 1037 hPa, 2012 1002 hPa, 2010
Mean Pressure 1012 hPa 1023 hPa 1036 hPa, 2012 1001 hPa, 2010
Mean Wind Speed 9.4 mph (+4.2) 5.3 mph (+0.1) 9.4 mph, 2021 2.1 mph, 2019
Maximum Wind Speed 20.3 mph 11:53 14.1 mph 20.3 mph, 2021 9.0 mph, 2019
Maximum Gust 33.1 mph 11:53 21.1 mph 35.9 mph, 2016 12.7 mph, 2019
Mean Wind Direction SW
Rainfall 3.8 mm 21.5 mm (61%) 6.3 mm, 2015
Maximum Hourly Rain 3.4 mm 13:40 3.4 mm, 2021
Maximum 10-min Rain 1.7 mm 13:08 1.7 mm, 2021
Maximum Rain Rate 14 mm/h 13:02 16 mm/h, 2010
Minimum Dew Point 1.8 °C 22:44 1.2 °C 4.4 °C, 2010 -8.0 °C, 2017
Maximum Dew Point 8.3 °C 12:58 5.8 °C 11.2 °C, 2016 -4.5 °C, 2013
Mean Dew Point 5.9 °C 3.5 °C 6.8 °C, 2016 -5.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.3 °C * 07:01 4.2 °C 9.3 °C, 2021 0.2 °C, 2013
Day Maximum (09-21) 12.2 °C 12:34 9.9 °C 17.8 °C, 2012 1.3 °C, 2013
Max 10m Temp Rise 0.3 °C 09:32 0.5 °C 1.1 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 0.9 °C 10:47 1.5 °C 3.4 °C, 2012 0.4 °C, 2013
Max 1hr Hum Rise 15% 13:28 8% 26%, 2014 4%, 2011
Max 10m Temp Fall 1.2 °C 13:10 0.5 °C 1.6 °C, 2014 0.2 °C, 2013
Max 1hr Temp Fall 3.2 °C 13:37 1.5 °C 4.5 °C, 2014 0.5 °C, 2013
Max 1hr Hum Fall 9% 15:23 8% 26%, 2015 3%, 2013
Max 10m Wind Speed 14.9 mph 12:01 10.6 mph 14.9 mph, 2021 6.4 mph, 2019
Minimum Feels-like -0.9 °C 23:31 0.5 °C 3.9 °C, 2016 -6.2 °C, 2013
Maximum Feels-like 12.4 °C 12:51 10.0 °C 17.8 °C, 2012 -1.1 °C, 2013
Mean Feels-like 6.6 °C 5.2 °C 9.5 °C, 2012 -4.0 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 0.3 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.2 °C (+0.2) 6.2 °C (-0.5) 14.6 °C (+7.7), 2012 1.5 °C (-5.5), 2013
Humidity Range 17% 23% 60%, 2012 17%, 2013
Pressure Range 7 hPa 7 hPa 19 hPa, 2016 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.2 [2%]68 hrs (78%) [25%] 11.3 [101%], 2012 0 [0%], 2013
Wet Hours 2
[Mean rain rate: 1.9 mm/h]
25 hrs (56%) [4%] 7, 2015 , 2009
Cloud Cover Overcast
Events None
Comments lunch 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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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