Daily Report for 19th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.2 °C (+2.1) 05:57 5.9 °C (+0.1) 11.2 °C (+5.1), 2018 2.1 °C (-4.0), 2021
Maximum Temperature 15.7 °C (+1.1) 15:34 14.9 °C (+1.0) 28.4 °C (+13.8), 2018 11.3 °C (-3.3), 2012
Mean Temperature 12.1 °C (+1.6) 10.3 °C (+0.6) 20.3 °C, 2018 7.7 °C, 2015
Minimum Humidity 52% 15:37 50% 71%, 2012 25%, 2018
Maximum Humidity 82% 05:41 88% 94%, 2012 69%, 2017
Mean Humidity 69% 71% 88%, 2012 51%, 2017
Minimum Pressure 1016 hPa 17:55 1012 hPa 1034 hPa, 2017 979 hPa, 2012
Maximum Pressure 1019 hPa 22:07 1020 hPa 1038 hPa, 2017 990 hPa, 2012
Mean Pressure 1017 hPa 1015 hPa 1036 hPa, 2017 984 hPa, 2012
Mean Wind Speed 3.8 mph (-1.1) 4.8 mph (-0.1) 5.6 mph, 2013 0.8 mph, 2021
Maximum Wind Speed 12.3 mph 17:37 13.6 mph 14.2 mph, 2020 6.7 mph, 2017
Maximum Gust 20.5 mph 18:57 21.8 mph 20.7 mph, 2020 9.4 mph, 2017
Mean Wind Direction NE
Rainfall 0.0 mm 14.9 mm (56%) 8.4 mm, 2012
Maximum Hourly Rain n/a 2.7, 2012
Maximum 10-min Rain n/a 1.5, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point 5.1 °C 05:57 2.3 °C 6.4 °C, 2018 -3.2 °C, 2017
Maximum Dew Point 9.0 °C 13:28 7.5 °C 12.0 °C, 2018 1.4 °C, 2017
Mean Dew Point 6.4 °C 5.0 °C 9.4 °C, 2018 -1.3 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.2 °C 05:59 6.0 °C 11.2 °C, 2018 2.1 °C, 2021
Day Maximum (09-21) 15.7 °C 15:34 14.9 °C 28.4 °C, 2018 11.3 °C, 2012
Max 10m Temp Rise 0.6 °C 08:00 0.7 °C 0.8 °C, 2020 0.5 °C, 2015
Max 1hr Temp Rise 1.8 °C 11:44 2.4 °C 3.4 °C, 2018 1.2 °C, 2013
Max 1hr Hum Rise 9% 21:22 11% 14%, 2019 4%, 2010
Max 10m Temp Fall 0.4 °C 13:14 0.8 °C 0.8 °C, 2018 0.3 °C, 2013
Max 1hr Temp Fall 1.4 °C 21:26 1.8 °C 3.5 °C, 2019 1.4 °C, 2013
Max 1hr Hum Fall 12% 14:33 11% 19%, 2016 7%, 2017
Max 10m Wind Speed 9.8 mph 19:06 10.4 mph 11.0 mph, 2020 4.2 mph, 2021
Minimum Feels-like 6.7 °C 23:55 3.6 °C 11.6 °C, 2018 0.4 °C, 2015
Maximum Feels-like 16.0 °C 12:34 15.5 °C 29.0 °C, 2018 11.3 °C, 2015
Mean Feels-like 12.1 °C 9.9 °C 21.4 °C, 2018 6.3 °C, 2015
Air-frost Hrs 0 hrs 0.3 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.5 °C (-1.0) 9.0 °C (+0.9) 17.2 °C (+8.7), 2018 4.8 °C (-3.7), 2012
Humidity Range 30% 38% 57%, 2018 23%, 2012
Pressure Range 2 hPa 8 hPa 14 hPa, 2013 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [16%]94 hrs (95%) [40%] 12.7 [100%], 2018 1 [8%], 2012
Wet Hours 016 hrs (55%) [3.5%] 5, 2012 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 12.5 °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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