Daily Report for 25th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.9 °C (-0.6) 05:47 6.2 °C (+0.3) 11.3 °C (+4.8), 2015 1.4 °C (-5.1), 2017
Maximum Temperature 13.7 °C (-1.6) 15:41 15.2 °C (+1.0) 22.4 °C (+7.1), 2013 11.1 °C (-4.2), 2017
Mean Temperature 9.3 °C (-1.1) 10.6 °C (+0.7) 16.4 °C, 2013 6.0 °C, 2017
Minimum Humidity 61% 13:51 50% 82%, 2014 33%, 2011
Maximum Humidity 91% 06:01 88% 97%, 2014 67%, 2017
Mean Humidity 78% 71% 93%, 2014 48%, 2017
Minimum Pressure 1015 hPa 04:04 1011 hPa 1027 hPa, 2021 982 hPa, 2012
Maximum Pressure 1020 hPa 23:54 1019 hPa 1031 hPa, 2021 998 hPa, 2012
Mean Pressure 1017 hPa 1015 hPa 1029 hPa, 2021 990 hPa, 2012
Mean Wind Speed 4.8 mph (-0.1) 5.1 mph (+0.2) 8.4 mph, 2018 3.8 mph, 2014
Maximum Wind Speed 11.1 mph 18:19 13.6 mph 25.6 mph, 2012 10.2 mph, 2014
Maximum Gust 24.0 mph 01:12 22.5 mph 45.3 mph, 2012 15.2 mph, 2014
Mean Wind Direction NE
Rainfall 2.9 mm 17.8 mm (51%) 14.2 mm, 2012
Maximum Hourly Rain 2.9 mm 16:50 4.3 mm, 2012
Maximum 10-min Rain 2.2 mm 16:15 2.2 mm, 2022
Maximum Rain Rate 30 mm/h 16:13 40 mm/h, 2012
Minimum Dew Point 4.0 °C 00:01 2.7 °C 6.9 °C, 2014 -6.7 °C, 2017
Maximum Dew Point 8.9 °C 17:34 7.9 °C 12.5 °C, 2014 -1.2 °C, 2017
Mean Dew Point 5.5 °C 5.3 °C 9.5 °C, 2013 -4.4 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.9 °C 05:40 6.3 °C 11.3 °C, 2015 1.4 °C, 2017
Day Maximum (09-21) 13.7 °C 15:42 15.2 °C 22.4 °C, 2013 11.1 °C, 2017
Max 10m Temp Rise 0.8 °C 11:08 0.7 °C 0.9 °C, 2019 0.2 °C, 2014
Max 1hr Temp Rise 2.2 °C 12:51 2.4 °C 2.7 °C, 2009 0.8 °C, 2014
Max 1hr Hum Rise 19% 17:00 10% 19%, 2022 4%, 2014
Max 10m Temp Fall 1.6 °C 16:18 0.8 °C 1.6 °C, 2022 0.4 °C, 2015
Max 1hr Temp Fall 3.1 °C 16:43 1.8 °C 3.8 °C, 2013 1.5 °C, 2009
Max 1hr Hum Fall 12% 18:25 11% 19%, 2019 2%, 2014
Max 10m Wind Speed 8.0 mph 18:23 10.4 mph 13.9 mph, 2018 7.5 mph, 2020
Minimum Feels-like 2.0 °C 04:09 3.6 °C 12.5 °C, 2015 -2.9 °C, 2017
Maximum Feels-like 13.9 °C 15:40 15.8 °C 23.5 °C, 2013 11.1 °C, 2017
Mean Feels-like 8.1 °C 10.1 °C 17.5 °C, 2013 3.6 °C, 2017
Air-frost Hrs 0 hrs 0.2 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.8 °C (-1.0) 9.0 °C (+0.7) 11.6 °C (+2.8), 2013 4.5 °C (-4.3), 2014
Humidity Range 30% 38% 55%, 2013 15%, 2014
Pressure Range 6 hPa 7 hPa 16 hPa, 2012 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [23%]130 hrs (98%) [42%] 13 [100%], 2011 0 [0%], 2014
Wet Hours 2
[Mean rain rate: 1.4 mm/h]
18 hrs (47%) [3%] 9, 2012 0, 2011
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 14.0 °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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