Daily Report for 22nd April 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (-3.5) 05:59 5.3 °C (-0.6) 12.1 °C (+5.8), 2018 2.3 °C (-4.0), 2010
Maximum Temperature 14.4 °C (-0.5) 17:44 13.5 °C (-0.5) 25.6 °C (+10.7), 2011 11.0 °C (-3.9), 2016
Mean Temperature 9.3 °C (-2.0) 9.2 °C (-0.6) 18.0 °C, 2011 7.8 °C, 2021
Minimum Humidity 53% 13:47 57% 60%, 2016 29%, 2019
Maximum Humidity 97% 08:09 92% 97%, 2023 75%, 2011
Mean Humidity 77% 78% 82%, 2014 50%, 2011
Minimum Pressure 1004 hPa 23:58 1014 hPa 1026 hPa, 2021 1002 hPa, 2019
Maximum Pressure 1010 hPa 00:02 1022 hPa 1033 hPa, 2015 1004 hPa, 2012
Mean Pressure 1007 hPa 1018 hPa 1030 hPa, 2015 1004 hPa, 2012
Mean Wind Speed 3.4 mph (-1.5) 5.6 mph (+0.7) 7.1 mph, 2022 2.7 mph, 2011
Maximum Wind Speed 11.3 mph 22:21 14.3 mph 18.5 mph, 2012 8.2 mph, 2010
Maximum Gust 18.4 mph 22:39 22.3 mph 25.1 mph, 2012 11.5 mph, 2017
Mean Wind Direction WSW
Rainfall 0.0 mm 31.4 mm (102%) 5.5 mm, 2016
Maximum Hourly Rain n/a 2.6, 2018
Maximum 10-min Rain n/a 1.3, 2018
Maximum Rain Rate n/a 13, 2018
Minimum Dew Point 1.8 °C 05:57 2.6 °C 6.7 °C, 2014 -3.6 °C, 2010
Maximum Dew Point 8.2 °C 23:56 7.6 °C 14.6 °C, 2018 2.4 °C, 2010
Mean Dew Point 5.1 °C 5.3 °C 11.8 °C, 2018 0.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.8 °C 05:58 5.7 °C 13.2 °C, 2018 2.3 °C, 2010
Day Maximum (09-21) 14.4 °C 17:44 13.5 °C 25.6 °C, 2011 11.0 °C, 2016
Max 10m Temp Rise 0.7 °C 11:55 0.6 °C 1.0 °C, 2019 0.2 °C, 2016
Max 1hr Temp Rise 2.5 °C 12:00 2.2 °C 3.6 °C, 2019 0.9 °C, 2016
Max 1hr Hum Rise 12% 23:09 12% 28%, 2012 7%, 2010
Max 10m Temp Fall 0.4 °C 14:28 0.6 °C 1.1 °C, 2012 0.3 °C, 2013
Max 1hr Temp Fall 1.3 °C 02:02 1.9 °C 4.3 °C, 2012 1.1 °C, 2013
Max 1hr Hum Fall 15% 12:07 12% 17%, 2014 3%, 2016
Max 10m Wind Speed 9.5 mph 22:30 11.1 mph 13.6 mph, 2018 6.1 mph, 2021
Minimum Feels-like 2.8 °C 05:45 2.2 °C 12.1 °C, 2018 -0.4 °C, 2021
Maximum Feels-like 14.4 °C 17:42 13.7 °C 25.8 °C, 2018 11.0 °C, 2016
Mean Feels-like 9.3 °C 8.1 °C 20.1 °C, 2018 7.0 °C, 2021
Air-frost Hrs 0 hrs 0.0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.6 °C (+3.0) 8.3 °C (+0.0) 16.4 °C (+7.8), 2019 5.2 °C (-3.4), 2016
Humidity Range 44% 35% 50%, 2012 26%, 2022
Pressure Range 6 hPa 8 hPa 13 hPa, 2019 1 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [31%]120 hrs (104%) [44%] 13 [101%], 2020 0 [0%], 2016
Wet Hours 042 hrs (125%) [8%] 10, 2016 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 11.7 °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