Daily Report for 30th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.7 °C (-4.2) 06:03 6.0 °C (-0.0) 10.9 °C (+4.0), 2011 1.8 °C (-5.1), 2021
Maximum Temperature 17.2 °C (+1.2) 16:06 14.9 °C (+0.5) 20.4 °C (+4.4), 2014 8.7 °C (-7.3), 2018
Mean Temperature 10.9 °C (-1.5) 10.4 °C (+0.2) 15.1 °C, 2011 6.4 °C, 2018
Minimum Humidity 45% 16:13 51% 62%, 2018 36%, 2013
Maximum Humidity 90% 06:42 88% 97%, 2014 71%, 2017
Mean Humidity 68% 71% 83%, 2020 52%, 2017
Minimum Pressure 1027 hPa 23:29 1014 hPa 1027 hPa, 2022 993 hPa, 2020
Maximum Pressure 1033 hPa 01:23 1021 hPa 1033 hPa, 2022 998 hPa, 2020
Mean Pressure 1030 hPa 1017 hPa 1030 hPa, 2022 996 hPa, 2020
Mean Wind Speed 0.9 mph (-4.0) 4.6 mph (-0.3) 7.9 mph, 2018 0.9 mph, 2022
Maximum Wind Speed 7.0 mph 16:11 12.9 mph 18.1 mph, 2011 7.0 mph, 2022
Maximum Gust 13.7 mph 01:22 21.5 mph 30.0 mph, 2020 11.5 mph, 2019
Mean Wind Direction S
Rainfall 0.0 mm 17.8 mm (42%) 10.9 mm, 2020
Maximum Hourly Rain n/a 4.6, 2020
Maximum 10-min Rain n/a 1.5, 2020
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 0.7 °C 05:39 2.7 °C 5.9 °C, 2010 -3.1 °C, 2016
Maximum Dew Point 8.5 °C 22:11 7.6 °C 12.5 °C, 2014 2.9 °C, 2013
Mean Dew Point 4.7 °C 5.1 °C 8.0 °C, 2010 -0.9 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.7 °C 06:05 6.1 °C 10.9 °C, 2011 1.8 °C, 2021
Day Maximum (09-21) 17.2 °C 15:38 14.9 °C 20.4 °C, 2014 8.7 °C, 2018
Max 10m Temp Rise 0.8 °C 07:02 0.7 °C 0.9 °C, 2021 0.4 °C, 2011
Max 1hr Temp Rise 3.6 °C 07:34 2.3 °C 3.6 °C, 2022 0.9 °C, 2018
Max 1hr Hum Rise 10% 20:40 10% 21%, 2021 5%, 2009
Max 10m Temp Fall 0.3 °C 15:07 0.7 °C 1.2 °C, 2020 0.3 °C, 2018
Max 1hr Temp Fall 1.2 °C 20:59 1.7 °C 4.1 °C, 2020 0.9 °C, 2018
Max 1hr Hum Fall 11% 07:45 11% 20%, 2014 6%, 2017
Max 10m Wind Speed 5.2 mph 18:53 9.8 mph 14.1 mph, 2020 5.2 mph, 2022
Minimum Feels-like 0.1 °C 01:22 3.5 °C 11.3 °C, 2011 -1.2 °C, 2018
Maximum Feels-like 17.2 °C 14:57 15.4 °C 20.4 °C, 2014 8.0 °C, 2018
Mean Feels-like 10.9 °C 10.0 °C 15.4 °C, 2011 2.8 °C, 2018
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 14.5 °C (+5.4) 8.9 °C (+0.5) 14.5 °C (+5.4), 2022 4.0 °C (-5.1), 2018
Humidity Range 45% 37% 60%, 2014 24%, 2009
Pressure Range 7 hPa 7 hPa 13 hPa, 2016 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [90%]152 hrs (94%) [40%] 13.4 [100%], 2011 0 [0%], 2018
Wet Hours 018 hrs (39%) [2.5%] 12, 2018 0, 2011
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 13.0 °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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