Daily Report for 5th April 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.5 °C (-2.1) 23:58 4.0 °C (-0.6) 9.1 °C (+4.5), 2011 1.3 °C (-3.3), 2013
Maximum Temperature 9.6 °C (-2.2) 00:02 11.5 °C (-0.2) 21.7 °C (+9.9), 2020 7.4 °C (-4.3), 2013
Mean Temperature 5.9 °C (-2.1) 7.6 °C (-0.4) 14.7 °C, 2020 3.8 °C, 2013
Minimum Humidity 27% 16:33 52% 74%, 2011 25%, 2020
Maximum Humidity 82% 05:00 84% 91%, 2011 78%, 2009
Mean Humidity 57% 69% 84%, 2011 53%, 2020
Minimum Pressure 1014 hPa 05:48 1023 hPa 1029 hPa, 2017 1000 hPa, 2019
Maximum Pressure 1023 hPa 23:07 1031 hPa 1032 hPa, 2017 1006 hPa, 2019
Mean Pressure 1019 hPa 1027 hPa 1030 hPa, 2017 1003 hPa, 2019
Mean Wind Speed 7.6 mph (+2.7) 6.4 mph (+1.5) 9.4 mph, 2013 1.9 mph, 2015
Maximum Wind Speed 17.9 mph 06:37 14.4 mph 17.9 mph, 2021 8.1 mph, 2015
Maximum Gust 30.8 mph 06:37 21.9 mph 30.8 mph, 2021 9.7 mph, 2015
Mean Wind Direction NNW
Rainfall / Snow-melt approx. trace 0.1 mm (1%) 1.4, 2011
Maximum Hourly Rain n/a 0.5, 2011
Maximum 10-min Rain n/a n/a
Maximum Rain Rate n/a n/a
Minimum Dew Point -11.0 °C 15:35 -1.7 °C 5.2 °C, 2011 -11.0 °C, 2021
Maximum Dew Point 5.7 °C 00:10 5.5 °C 11.6 °C, 2014 -1.1 °C, 2013
Mean Dew Point -2.6 °C 2.1 °C 8.3 °C, 2011 -3.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.2 °C * 08:47 5.0 °C 9.1 °C, 2011 1.3 °C, 2013
Day Maximum (09-21) * 6.7 °C * 16:33 11.0 °C 21.7 °C, 2020 6.7 °C, 2021
Max 10m Temp Rise 0.5 °C 10:51 0.6 °C 0.9 °C, 2014 0.2 °C, 2011
Max 1hr Temp Rise 1.1 °C 12:50 1.4 °C 3.1 °C, 2014 0.8 °C, 2012
Max 1hr Hum Rise 14% 08:53 8% 18%, 2013 5%, 2011
Max 10m Temp Fall 0.7 °C 08:43 0.5 °C 0.7 °C, 2021 0.3 °C, 2010
Max 1hr Temp Fall 1.9 °C 10:38 1.9 °C 1.9 °C, 2021 1.1 °C, 2014
Max 1hr Hum Fall 18% 06:58 9% 18%, 2018 7%, 2012
Max 10m Wind Speed 13.0 mph 06:40 10.9 mph 14.2 mph, 2019 5.3 mph, 2015
Minimum Feels-like -3.3 °C 10:42 0.0 °C 6.3 °C, 2016 -4.6 °C, 2013
Maximum Feels-like 8.4 °C 00:14 10.7 °C 21.7 °C, 2020 4.9 °C, 2013
Mean Feels-like 2.4 °C 5.4 °C 14.4 °C, 2020 -0.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (-0.1) 7.5 °C (+0.4) 15.1 °C (+7.9), 2020 3.5 °C (-3.7), 2011
Humidity Range 55% 32% 55%, 2020 17%, 2011
Pressure Range 9 hPa 8 hPa 19 hPa, 2018 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6.5 [55%]24 hrs (104%) [41%] 12 [101%], 2020 0 [0%], 2011
Wet Hours 0.30.3 hrs (4%) [0.3%] 3, 2011 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Sunny
Events Snowfall: trace amount
Comments 1030 sn sh
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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Webcam Summary of Cloud Conditions

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