Daily Report for 18th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.9 °C (+2.9) 06:20 5.7 °C (-0.0) 12.3 °C (+6.3), 2018 0.4 °C (-5.6), 2021
Maximum Temperature 17.4 °C (+2.9) 15:22 14.9 °C (+1.0) 24.9 °C (+10.4), 2018 11.4 °C (-3.1), 2012
Mean Temperature 13.0 °C (+2.9) 10.2 °C (+0.5) 18.3 °C, 2018 8.2 °C, 2012
Minimum Humidity 38% 15:54 50% 70%, 2020 28%, 2018
Maximum Humidity 82% 06:37 88% 97%, 2009 70%, 2013
Mean Humidity 62% 71% 81%, 2012 54%, 2017
Minimum Pressure 1017 hPa 18:34 1012 hPa 1026 hPa, 2015 977 hPa, 2012
Maximum Pressure 1019 hPa 10:11 1020 hPa 1032 hPa, 2017 992 hPa, 2012
Mean Pressure 1018 hPa 1015 hPa 1029 hPa, 2017 984 hPa, 2012
Mean Wind Speed 2.3 mph (-2.6) 4.8 mph (-0.1) 10.6 mph, 2013 0.9 mph, 2021
Maximum Wind Speed 9.9 mph 16:54 13.6 mph 20.8 mph, 2013 7.1 mph, 2010
Maximum Gust 18.2 mph 01:08 21.9 mph 30.1 mph, 2013 10.0 mph, 2010
Mean Wind Direction WNW
Rainfall 0.0 mm 14.9 mm (59%) 3.4 mm, 2012
Maximum Hourly Rain n/a 1.3, 2020
Maximum 10-min Rain n/a 0.6, 2012
Maximum Rain Rate n/a 5, 2012
Minimum Dew Point 2.7 °C 15:54 2.1 °C 5.0 °C, 2018 -3.2 °C, 2021
Maximum Dew Point 7.8 °C 11:18 7.4 °C 13.4 °C, 2018 1.3 °C, 2017
Mean Dew Point 5.5 °C 4.9 °C 10.4 °C, 2018 -0.8 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.9 °C 06:18 5.9 °C 12.3 °C, 2018 0.4 °C, 2021
Day Maximum (09-21) 17.4 °C 15:12 14.9 °C 24.9 °C, 2018 11.4 °C, 2012
Max 10m Temp Rise 0.5 °C 10:51 0.7 °C 1.2 °C, 2009 0.4 °C, 2020
Max 1hr Temp Rise 2.1 °C 11:17 2.4 °C 4.7 °C, 2021 1.5 °C, 2020
Max 1hr Hum Rise 14% 20:56 11% 24%, 2013 4%, 2016
Max 10m Temp Fall 0.6 °C 20:54 0.8 °C 2.5 °C, 2013 0.4 °C, 2015
Max 1hr Temp Fall 2.9 °C 20:59 1.9 °C 4.3 °C, 2013 1.4 °C, 2012
Max 1hr Hum Fall 12% 13:05 11% 19%, 2021 6%, 2020
Max 10m Wind Speed 7.2 mph 17:02 10.5 mph 14.9 mph, 2013 4.7 mph, 2021
Minimum Feels-like 8.9 °C 06:14 3.4 °C 13.4 °C, 2018 0.4 °C, 2021
Maximum Feels-like 17.4 °C 14:53 15.4 °C 26.6 °C, 2018 11.7 °C, 2012
Mean Feels-like 13.0 °C 9.8 °C 19.8 °C, 2018 6.3 °C, 2012
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 8.5 °C (+0.1) 9.1 °C (+1.0) 16.0 °C (+7.6), 2010 5.4 °C (-3.0), 2012
Humidity Range 44% 38% 56%, 2018 20%, 2020
Pressure Range 2 hPa 8 hPa 15 hPa, 2012 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7 [55%]92 hrs (98%) [42%] 12.7 [100%], 2018 0.5 [4%], 2020
Wet Hours 016 hrs (58%) [3.7%] 4, 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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