Daily Report for 29th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.4 °C (+5.0) 23:58 4.1 °C (+0.5) 11.5 °C (+7.1), 2017 -1.3 °C (-5.7), 2013
Maximum Temperature 19.3 °C (+7.9) 16:24 10.4 °C (+0.1) 19.3 °C (+7.9), 2021 5.7 °C (-5.7), 2013
Mean Temperature 13.1 °C (+6.5) 7.3 °C (+0.3) 13.2 °C, 2017 2.1 °C, 2013
Minimum Humidity 32% 18:17 65% 83%, 2010 32%, 2014
Maximum Humidity 84% 06:51 89% 97%, 2010 70%, 2012
Mean Humidity 69% 79% 91%, 2010 53%, 2012
Minimum Pressure 1025 hPa 02:26 1019 hPa 1035 hPa, 2020 992 hPa, 2010
Maximum Pressure 1030 hPa 23:31 1026 hPa 1041 hPa, 2020 1004 hPa, 2010
Mean Pressure 1028 hPa 1023 hPa 1038 hPa, 2020 998 hPa, 2010
Mean Wind Speed 8.5 mph (+3.3) 5.8 mph (+0.6) 10.0 mph, 2015 1.2 mph, 2011
Maximum Wind Speed 17.2 mph 01:02 14.5 mph 27.3 mph, 2015 4.0 mph, 2017
Maximum Gust 26.2 mph 01:02 21.8 mph 42.0 mph, 2015 7.3 mph, 2017
Mean Wind Direction WSW
Rainfall 0.0 mm 21.5 mm (55%) 6.9 mm, 2016
Maximum Hourly Rain n/a 5, 2016
Maximum 10-min Rain n/a 1.5, 2016
Maximum Rain Rate n/a 24, 2016
Minimum Dew Point 0.9 °C 18:19 1.3 °C 7.7 °C, 2017 -7.5 °C, 2013
Maximum Dew Point 11.0 °C 14:28 6.0 °C 11.0 °C, 2021 -3.0 °C, 2013
Mean Dew Point 7.2 °C 3.8 °C 9.4 °C, 2017 -5.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.8 °C * 23:29 4.5 °C 11.5 °C, 2017 -1.3 °C, 2013
Day Maximum (09-21) 19.3 °C 16:25 10.4 °C 19.3 °C, 2021 5.7 °C, 2013
Max 10m Temp Rise 0.6 °C 11:26 0.5 °C 1.0 °C, 2009 0.3 °C, 2010
Max 1hr Temp Rise 2.3 °C 11:38 1.5 °C 5.2 °C, 2019 0.9 °C, 2010
Max 1hr Hum Rise 28% 19:23 8% 28%, 2021 5%, 2010
Max 10m Temp Fall 0.6 °C 19:24 0.5 °C 1.4 °C, 2020 0.2 °C, 2010
Max 1hr Temp Fall 2.5 °C 20:02 1.5 °C 2.7 °C, 2012 0.7 °C, 2010
Max 1hr Hum Fall 13% 16:12 8% 26%, 2019 5%, 2010
Max 10m Wind Speed 14.8 mph 01:07 11.0 mph 19.0 mph, 2015 4.0 mph, 2011
Minimum Feels-like 5.9 °C 00:07 0.7 °C 11.8 °C, 2017 -5.6 °C, 2013
Maximum Feels-like 20.3 °C 14:38 10.5 °C 20.3 °C, 2021 3.7 °C, 2020
Mean Feels-like 12.9 °C 5.6 °C 14.2 °C, 2017 -1.3 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.9 °C (+2.9) 6.3 °C (-0.4) 14.3 °C (+7.2), 2019 3.5 °C (-3.5), 2017
Humidity Range 52% 24% 59%, 2014 8%, 2017
Pressure Range 5 hPa 7 hPa 14 hPa, 2015 3 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [70%]82 hrs (83%) [27%] 11.4 [100%], 2019 0 [0%], 2017
Wet Hours 025 hrs (50%) [3.6%] 7, 2015 , 2009
Cloud Cover am: Overcast transitioned to Mostly Sunny
pm: Sunny
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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