Daily Report for 28th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.7 °C (+4.4) 00:47 3.9 °C (+0.4) 8.7 °C (+4.4), 2021 -1.2 °C (-5.5), 2013
Maximum Temperature 12.1 °C (+0.8) 17:36 10.0 °C (-0.2) 20.8 °C (+9.5), 2012 4.0 °C (-7.3), 2013
Mean Temperature 10.4 °C (+2.6) 7.1 °C (+0.1) 12.5 °C, 2012 1.7 °C, 2013
Minimum Humidity 78% 12:17 67% 78%, 2021 27%, 2012
Maximum Humidity 83% 23:55 90% 98%, 2014 61%, 2012
Mean Humidity 80% 79% 86%, 2018 43%, 2012
Minimum Pressure 1022 hPa 06:17 1019 hPa 1034 hPa, 2019 974 hPa, 2016
Maximum Pressure 1025 hPa 23:02 1026 hPa 1038 hPa, 2019 997 hPa, 2016
Mean Pressure 1024 hPa 1023 hPa 1036 hPa, 2019 987 hPa, 2016
Mean Wind Speed 12.2 mph (+7.0) 5.7 mph (+0.5) 12.2 mph, 2021 1.4 mph, 2012
Maximum Wind Speed 20.6 mph 20:06 14.4 mph 24.1 mph, 2016 4.0 mph, 2017
Maximum Gust 30.8 mph 20:07 21.6 mph 44.9 mph, 2016 7.3 mph, 2017
Mean Wind Direction SW
Rainfall 0.0 mm 21.5 mm (57%) 11.7 mm, 2018
Maximum Hourly Rain n/a 3.9, 2016
Maximum 10-min Rain n/a 1.1, 2016
Maximum Rain Rate n/a 18, 2016
Minimum Dew Point 5.5 °C 23:07 1.3 °C 5.5 °C, 2021 -7.5 °C, 2013
Maximum Dew Point 8.7 °C 15:47 5.9 °C 10.8 °C, 2015 -1.4 °C, 2013
Mean Dew Point 7.1 °C 3.6 °C 7.8 °C, 2015 -4.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.5 °C * 21:11 4.3 °C 8.5 °C, 2021 -1.2 °C, 2013
Day Maximum (09-21) 12.1 °C 17:32 10.0 °C 20.8 °C, 2012 4.0 °C, 2013
Max 10m Temp Rise 0.2 °C 10:29 0.4 °C 1.2 °C, 2012 0.2 °C, 2021
Max 1hr Temp Rise 0.7 °C 10:38 1.5 °C 6.3 °C, 2012 0.7 °C, 2021
Max 1hr Hum Rise 2% 00:01 7% 20%, 2016 2%, 2021
Max 10m Temp Fall 0.2 °C 14:24 0.5 °C 1.4 °C, 2009 0.2 °C, 2014
Max 1hr Temp Fall 0.7 °C 19:02 1.5 °C 3.6 °C, 2009 0.7 °C, 2021
Max 1hr Hum Fall 3% 03:18 8% 30%, 2014 3%, 2021
Max 10m Wind Speed 17.7 mph 20:11 10.9 mph 18.4 mph, 2016 4.0 mph, 2017
Minimum Feels-like 4.2 °C 00:29 0.5 °C 5.7 °C, 2019 -6.8 °C, 2013
Maximum Feels-like 12.8 °C 17:19 10.1 °C 20.8 °C, 2012 1.7 °C, 2013
Mean Feels-like 9.1 °C 5.4 °C 12.5 °C, 2012 -2.2 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 7 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.4 °C (-3.6) 6.2 °C (-0.5) 17.5 °C (+10.5), 2012 3.4 °C (-3.6), 2021
Humidity Range 5% 23% 54%, 2014 5%, 2021
Pressure Range 4 hPa 7 hPa 23 hPa, 2016 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]74 hrs (78%) [25%] 11.42 [101%], 2012 0 [0%], 2015
Wet Hours 025 hrs (52%) [3.7%] 10, 2018 , 2009
Cloud Cover Overcast
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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