Daily Report for 6th April 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.2 °C (-4.8) 23:53 3.3 °C (-1.3) 12.9 °C (+8.3), 2014 -2.3 °C (-6.9), 2012
Maximum Temperature 6.6 °C (-5.2) 13:50 10.7 °C (-1.0) 22.4 °C (+10.6), 2011 6.6 °C (-5.2), 2021
Mean Temperature 3.0 °C (-5.0) 6.9 °C (-1.1) 16.8 °C, 2011 3.0 °C, 2021
Minimum Humidity 36% 15:00 50% 80%, 2014 31%, 2011
Maximum Humidity 81% 23:33 84% 96%, 2014 79%, 2017
Mean Humidity 62% 68% 91%, 2014 60%, 2010
Minimum Pressure 1019 hPa 16:17 1022 hPa 1029 hPa, 2015 1004 hPa, 2009
Maximum Pressure 1023 hPa 00:04 1029 hPa 1036 hPa, 2015 1007 hPa, 2019
Mean Pressure 1021 hPa 1026 hPa 1031 hPa, 2015 1006 hPa, 2019
Mean Wind Speed 6.4 mph (+1.5) 6.4 mph (+1.5) 7.8 mph, 2014 2.1 mph, 2017
Maximum Wind Speed 18.2 mph 13:42 15.0 mph 18.2 mph, 2021 8.1 mph, 2017
Maximum Gust 27.4 mph 14:31 22.8 mph 30.4 mph, 2016 10.5 mph, 2017
Mean Wind Direction NNW
Rainfall / Snow-melt approx. 0.0 mm 0.1 mm (1%) 3.3 mm, 2014
Maximum Hourly Rain n/a 1.5, 2014
Maximum 10-min Rain n/a 0.8, 2014
Maximum Rain Rate n/a 2.2, 2014
Minimum Dew Point -7.6 °C 15:00 -2.7 °C 11.5 °C, 2014 -7.6 °C, 2021
Maximum Dew Point -1.6 °C 09:06 4.3 °C 13.1 °C, 2014 -1.6 °C, 2021
Mean Dew Point -4.0 °C 1.1 °C 12.2 °C, 2014 -4.0 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 0.5 °C * 06:47 4.2 °C 12.9 °C, 2014 -2.3 °C, 2012
Day Maximum (09-21) 6.6 °C 13:52 10.2 °C 22.4 °C, 2011 6.6 °C, 2021
Max 10m Temp Rise 0.6 °C 11:29 0.6 °C 1.0 °C, 2012 0.2 °C, 2014
Max 1hr Temp Rise 1.8 °C 09:13 1.5 °C 4.5 °C, 2012 0.7 °C, 2014
Max 1hr Hum Rise 18% 18:01 9% 18%, 2021 4%, 2010
Max 10m Temp Fall 0.7 °C 17:33 0.6 °C 1.0 °C, 2016 0.2 °C, 2010
Max 1hr Temp Fall 1.7 °C 20:12 1.8 °C 2.0 °C, 2013 0.9 °C, 2010
Max 1hr Hum Fall 15% 10:47 10% 28%, 2016 5%, 2014
Max 10m Wind Speed 13.0 mph 13:45 11.2 mph 14.1 mph, 2016 5.8 mph, 2017
Minimum Feels-like -4.7 °C 22:57 -0.7 °C 15.2 °C, 2014 -4.7 °C, 2021
Maximum Feels-like 4.6 °C 12:44 9.7 °C 23.6 °C, 2011 4.6 °C, 2021
Mean Feels-like -0.7 °C 4.3 °C 17.6 °C, 2011 -0.7 °C, 2021
Air-frost Hrs 0.5 hrs 0.1 hrs 5 hrs, 2012 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.8 °C (-0.3) 7.4 °C (+0.2) 15.0 °C (+7.9), 2012 2.2 °C (-5.0), 2014
Humidity Range 45% 34% 60%, 2011 14%, 2019
Pressure Range 4 hPa 7 hPa 17 hPa, 2020 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [50%]30 hrs (108%) [42%] 12 [101%], 2017 0 [0%], 2014
Wet Hours 0.10.4 hrs (4%) [0.3%] 5, 2014 0, 2009
Cloud Cover am: Mostly Sunny
pm: Mostly Cloudy
Events Snowfall: trace amount
Comments possible snow in eve
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