Daily Report for 3rd April 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.1 °C (+0.5) 02:03 5.2 °C (+0.6) 10.7 °C (+6.1), 2014 -0.1 °C (-4.6), 2013
Maximum Temperature 9.1 °C (-2.6) 14:47 11.0 °C (-0.7) 18.9 °C (+7.2), 2014 4.2 °C (-7.5), 2013
Mean Temperature 6.7 °C (-1.0) 7.8 °C (-0.1) 13.8 °C, 2014 2.3 °C, 2013
Minimum Humidity 62% 14:16 63% 70%, 2018 47%, 2013
Maximum Humidity 85% 02:01 85% 96%, 2009 78%, 2011
Mean Humidity 72% 73% 87%, 2015 61%, 2013
Minimum Pressure 1032 hPa 03:29 1027 hPa 1032 hPa, 2021 993 hPa, 2018
Maximum Pressure 1034 hPa 11:52 1032 hPa 1034 hPa, 2021 997 hPa, 2018
Mean Pressure 1033 hPa 1030 hPa 1033 hPa, 2021 995 hPa, 2018
Mean Wind Speed 6.1 mph (+1.2) 7.1 mph (+2.2) 9.9 mph, 2013 1.6 mph, 2019
Maximum Wind Speed 12.4 mph 04:27 14.3 mph 21.0 mph, 2013 8.7 mph, 2015
Maximum Gust 20.5 mph 13:53 20.9 mph 31.1 mph, 2018 12.8 mph, 2015
Mean Wind Direction NE
Rainfall 0.0 mm 0.0 mm (0%) 6.3 mm, 2012
Maximum Hourly Rain n/a 2.5, 2010
Maximum 10-min Rain n/a 1.2, 2012
Maximum Rain Rate n/a 24, 2016
Minimum Dew Point 0.8 °C 23:57 0.9 °C 8.0 °C, 2014 -7.0 °C, 2013
Maximum Dew Point 3.1 °C 00:02 5.4 °C 11.5 °C, 2014 -1.5 °C, 2013
Mean Dew Point 1.9 °C 3.3 °C 9.2 °C, 2014 -4.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.1 °C 02:02 5.8 °C 10.7 °C, 2014 -0.1 °C, 2013
Day Maximum (09-21) 9.1 °C 14:47 11.0 °C 18.9 °C, 2014 4.2 °C, 2013
Max 10m Temp Rise 0.4 °C 14:13 0.6 °C 0.8 °C, 2009 0.3 °C, 2018
Max 1hr Temp Rise 0.9 °C 14:14 1.3 °C 3.2 °C, 2009 0.9 °C, 2021
Max 1hr Hum Rise 3% 01:01 5% 18%, 2016 3%, 2021
Max 10m Temp Fall 0.3 °C 23:55 0.6 °C 1.3 °C, 2012 0.2 °C, 2013
Max 1hr Temp Fall 0.8 °C 01:01 2.0 °C 3.0 °C, 2020 0.7 °C, 2013
Max 1hr Hum Fall 9% 04:42 7% 18%, 2013 6%, 2015
Max 10m Wind Speed 9.6 mph 11:48 11.4 mph 16.0 mph, 2013 6.5 mph, 2010
Minimum Feels-like 0.6 °C 04:21 0.5 °C 11.3 °C, 2014 -5.9 °C, 2013
Maximum Feels-like 7.4 °C 15:14 10.0 °C 20.5 °C, 2014 1.2 °C, 2013
Mean Feels-like 3.9 °C 5.3 °C 14.7 °C, 2014 -2.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0.6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.0 °C (-3.1) 5.8 °C (-1.3) 10.9 °C (+3.8), 2017 4.0 °C (-3.1), 2021
Humidity Range 23% 22% 41%, 2016 23%, 2018
Pressure Range 2 hPa 5 hPa 9 hPa, 2015 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]8.6 hrs (62%) [24%] 8 [68%], 2017 0 [0%], 2015
Wet Hours 00 hrs (0%) [0%] 9, 2015 0, 2009
Cloud Cover am: Overcast
pm: Overcast or Mostly Cloudy
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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Wind rose