Daily Report for 27th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.9 °C (-0.8) 03:15 6.1 °C (+0.2) 9.3 °C (+2.6), 2012 0.8 °C (-5.9), 2021
Maximum Temperature 10.7 °C (-4.9) 15:17 15.1 °C (+0.8) 20.8 °C (+5.2), 2010 9.9 °C (-5.7), 2009
Mean Temperature 8.7 °C (-2.8) 10.5 °C (+0.5) 14.1 °C, 2010 6.4 °C, 2016
Minimum Humidity 62% 13:57 51% 78%, 2018 31%, 2021
Maximum Humidity 85% 03:23 88% 93%, 2018 77%, 2017
Mean Humidity 74% 71% 86%, 2018 53%, 2015
Minimum Pressure 1027 hPa 00:00 1012 hPa 1027 hPa, 2022 994 hPa, 2009
Maximum Pressure 1031 hPa 23:56 1019 hPa 1031 hPa, 2022 1004 hPa, 2009
Mean Pressure 1029 hPa 1015 hPa 1029 hPa, 2022 999 hPa, 2009
Mean Wind Speed 3.3 mph (-1.6) 4.9 mph (+0.0) 11.5 mph, 2019 1.0 mph, 2021
Maximum Wind Speed 11.2 mph 18:22 13.4 mph 22.3 mph, 2019 5.9 mph, 2021
Maximum Gust 18.2 mph 01:17 22.2 mph 34.6 mph, 2019 12.5 mph, 2021
Mean Wind Direction NE
Rainfall 0.0 mm 17.8 mm (47%) 7.7 mm, 2018
Maximum Hourly Rain n/a 2.4, 2018
Maximum 10-min Rain n/a 1.2, 2012
Maximum Rain Rate n/a 20, 2012
Minimum Dew Point 3.3 °C 23:47 2.7 °C 5.3 °C, 2012 -4.2 °C, 2016
Maximum Dew Point 5.2 °C 16:13 7.7 °C 10.6 °C, 2020 1.7 °C, 2016
Mean Dew Point 4.1 °C 5.2 °C 7.5 °C, 2020 -1.6 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.9 °C 03:16 6.2 °C 9.5 °C, 2012 0.8 °C, 2021
Day Maximum (09-21) 10.7 °C 15:12 15.1 °C 20.8 °C, 2010 9.9 °C, 2009
Max 10m Temp Rise 0.3 °C 09:43 0.7 °C 0.8 °C, 2011 0.3 °C, 2022
Max 1hr Temp Rise 1.2 °C 09:50 2.3 °C 2.7 °C, 2017 1.2 °C, 2009
Max 1hr Hum Rise 8% 20:40 11% 15%, 2019 6%, 2010
Max 10m Temp Fall 0.3 °C 12:03 0.7 °C 0.9 °C, 2020 0.3 °C, 2010
Max 1hr Temp Fall 1.3 °C 20:49 1.8 °C 2.7 °C, 2020 0.8 °C, 2018
Max 1hr Hum Fall 7% 07:49 11% 30%, 2015 4%, 2009
Max 10m Wind Speed 8.5 mph 18:24 10.2 mph 18.0 mph, 2019 4.8 mph, 2021
Minimum Feels-like 2.7 °C 01:17 3.5 °C 6.7 °C, 2012 -2.6 °C, 2016
Maximum Feels-like 10.7 °C 15:03 15.5 °C 21.5 °C, 2010 10.7 °C, 2013
Mean Feels-like 8.0 °C 10.0 °C 14.4 °C, 2010 4.5 °C, 2016
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 4.8 °C (-4.1) 8.9 °C (+0.6) 15.7 °C (+6.8), 2021 3.9 °C (-5.0), 2018
Humidity Range 23% 37% 61%, 2021 15%, 2018
Pressure Range 4 hPa 7 hPa 12 hPa, 2012 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]138 hrs (96%) [41%] 11 [84%], 2011 0 [0%], 2018
Wet Hours 018 hrs (43%) [2.8%] 8, 2018 0, 2010
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose