Daily Report for 15th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.7 °C (+2.8) 06:36 5.2 °C (-0.4) 10.8 °C (+4.9), 2013 0.9 °C (-5.0), 2021
Maximum Temperature 21.8 °C (+7.6) 14:12 14.1 °C (+0.4) 24.2 °C (+10.0), 2015 9.5 °C (-4.7), 2012
Mean Temperature 15.2 °C (+5.2) 9.6 °C (-0.0) 17.3 °C, 2015 5.7 °C, 2021
Minimum Humidity 47% 15:41 52% 67%, 2016 27%, 2015
Maximum Humidity 88% 07:03 88% 96%, 2009 70%, 2015
Mean Humidity 71% 72% 86%, 2016 48%, 2015
Minimum Pressure 1026 hPa 00:05 1010 hPa 1033 hPa, 2021 996 hPa, 2016
Maximum Pressure 1030 hPa 23:58 1019 hPa 1035 hPa, 2021 1005 hPa, 2016
Mean Pressure 1028 hPa 1014 hPa 1034 hPa, 2021 1000 hPa, 2016
Mean Wind Speed 1.6 mph (-3.3) 5.2 mph (+0.3) 8.2 mph, 2013 1.0 mph, 2016
Maximum Wind Speed 8.6 mph 18:18 14.3 mph 19.4 mph, 2012 8.1 mph, 2011
Maximum Gust 12.5 mph 19:48 22.9 mph 27.0 mph, 2012 10.7 mph, 2011
Mean Wind Direction S
Rainfall 0.0 mm 14.9 mm (71%) 21.1 mm, 2016
Maximum Hourly Rain n/a 6.9, 2016
Maximum 10-min Rain n/a 2.1, 2016
Maximum Rain Rate n/a 42, 2016
Minimum Dew Point 6.4 °C 06:24 1.9 °C 7.4 °C, 2009 -4.6 °C, 2012
Maximum Dew Point 12.4 °C 17:37 7.1 °C 14.5 °C, 2009 2.4 °C, 2012
Mean Dew Point 9.6 °C 4.6 °C 10.0 °C, 2009 -0.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.7 °C 06:36 5.4 °C 11.0 °C, 2013 0.9 °C, 2021
Day Maximum (09-21) 21.8 °C 14:12 14.1 °C 24.2 °C, 2015 9.5 °C, 2012
Max 10m Temp Rise 0.7 °C 08:12 0.7 °C 1.1 °C, 2020 0.4 °C, 2011
Max 1hr Temp Rise 3.3 °C 08:52 2.3 °C 4.6 °C, 2020 1.5 °C, 2017
Max 1hr Hum Rise 13% 16:54 11% 26%, 2012 3%, 2017
Max 10m Temp Fall 0.6 °C 17:50 0.8 °C 1.7 °C, 2012 0.3 °C, 2013
Max 1hr Temp Fall 2.3 °C 20:15 1.8 °C 3.6 °C, 2015 1.1 °C, 2013
Max 1hr Hum Fall 12% 08:37 11% 21%, 2012 6%, 2016
Max 10m Wind Speed 6.7 mph 18:23 11.0 mph 12.3 mph, 2013 5.4 mph, 2011
Minimum Feels-like 8.7 °C 06:31 2.6 °C 10.8 °C, 2013 -1.7 °C, 2012
Maximum Feels-like 23.4 °C 14:09 14.8 °C 24.2 °C, 2015 7.8 °C, 2012
Mean Feels-like 16.3 °C 9.1 °C 17.3 °C, 2015 3.1 °C, 2012
Air-frost Hrs 0 hrs 0.4 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.1 °C (+4.8) 8.9 °C (+0.8) 16.0 °C (+7.7), 2020 3.9 °C (-4.4), 2016
Humidity Range 41% 36% 52%, 2020 24%, 2016
Pressure Range 5 hPa 9 hPa 13 hPa, 2012 3 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [80%]62 hrs (80%) [34%] 12.6 [101%], 2020 0.1 [1%], 2011
Wet Hours 016 hrs (70%) [4.4%] 16, 2016 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 11.0 °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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose