Daily Report for 2nd April 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.8 °C (+0.3) 06:19 5.2 °C (+0.7) 11.1 °C (+6.6), 2011 -1.0 °C (-5.5), 2013
Maximum Temperature 9.8 °C (-1.9) 15:17 11.9 °C (+0.2) 18.6 °C (+6.9), 2014 7.3 °C (-4.4), 2013
Mean Temperature 6.6 °C (-0.8) 8.4 °C (+0.4) 15.1 °C, 2011 3.2 °C, 2013
Minimum Humidity 61% 13:52 63% 83%, 2018 34%, 2013
Maximum Humidity 80% 23:53 84% 96%, 2018 80%, 2020
Mean Humidity 72% 74% 91%, 2018 55%, 2013
Minimum Pressure 1029 hPa 04:40 1025 hPa 1029 hPa, 2021 995 hPa, 2018
Maximum Pressure 1033 hPa 22:07 1032 hPa 1033 hPa, 2021 1008 hPa, 2010
Mean Pressure 1031 hPa 1028 hPa 1031 hPa, 2021 1000 hPa, 2018
Mean Wind Speed 7.5 mph (+2.6) 7.6 mph (+2.7) 8.3 mph, 2013 2.1 mph, 2012
Maximum Wind Speed 16.1 mph 14:46 15.2 mph 19.2 mph, 2013 7.4 mph, 2017
Maximum Gust 21.7 mph 19:56 21.1 mph 26.3 mph, 2013 10.5 mph, 2017
Mean Wind Direction NE
Rainfall 0.0 mm 0.0 mm (0%) 13.6 mm, 2018
Maximum Hourly Rain n/a 2.2, 2018
Maximum 10-min Rain n/a 0.9, 2015
Maximum Rain Rate n/a 42, 2015
Minimum Dew Point 0.2 °C 06:06 1.0 °C 6.8 °C, 2014 -9.3 °C, 2013
Maximum Dew Point 3.6 °C 15:44 6.5 °C 11.4 °C, 2011 -1.1 °C, 2013
Mean Dew Point 1.8 °C 4.1 °C 9.0 °C, 2011 -5.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.8 °C 06:18 6.2 °C 12.5 °C, 2011 -1.0 °C, 2013
Day Maximum (09-21) 9.8 °C 15:20 11.9 °C 18.6 °C, 2014 7.3 °C, 2013
Max 10m Temp Rise 0.7 °C 13:37 0.6 °C 1.1 °C, 2012 0.3 °C, 2015
Max 1hr Temp Rise 1.4 °C 12:38 1.4 °C 5.4 °C, 2012 1.1 °C, 2015
Max 1hr Hum Rise 7% 16:48 6% 15%, 2019 5%, 2009
Max 10m Temp Fall 0.5 °C 16:13 0.7 °C 1.0 °C, 2015 0.2 °C, 2009
Max 1hr Temp Fall 1.7 °C 17:03 2.5 °C 2.5 °C, 2015 0.8 °C, 2009
Max 1hr Hum Fall 5% 12:26 6% 22%, 2015 5%, 2018
Max 10m Wind Speed 12.7 mph 19:56 12.2 mph 13.6 mph, 2013 5.7 mph, 2017
Minimum Feels-like 0.1 °C 07:12 0.4 °C 11.1 °C, 2011 -6.5 °C, 2013
Maximum Feels-like 8.3 °C 14:29 11.3 °C 20.3 °C, 2011 6.1 °C, 2013
Mean Feels-like 3.3 °C 6.0 °C 16.1 °C, 2011 -0.9 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.0 °C (-2.1) 6.7 °C (-0.4) 12.6 °C (+5.5), 2012 4.8 °C (-2.3), 2010
Humidity Range 19% 22% 55%, 2015 13%, 2018
Pressure Range 4 hPa 6 hPa 16 hPa, 2018 4 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [30%]8.5 hrs (92%) [36%] 11 [94%], 2013 0 [0%], 2018
Wet Hours 00 hrs (0%) [0%] 12, 2018 0, 2009
Cloud Cover am: Overcast
pm: Mostly Sunny transitioned to 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