Daily Report for 29th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.6 °C (-1.3) 05:58 6.1 °C (+0.1) 11.4 °C (+4.5), 2010 2.9 °C (-4.0), 2009
Maximum Temperature 10.6 °C (-5.3) 17:15 14.9 °C (+0.4) 19.5 °C (+3.6), 2011 7.6 °C (-8.3), 2018
Mean Temperature 8.5 °C (-3.3) 10.4 °C (+0.3) 14.9 °C, 2010 6.7 °C, 2018
Minimum Humidity 63% 17:11 52% 81%, 2018 36%, 2013
Maximum Humidity 88% 05:54 88% 98%, 2012 78%, 2017
Mean Humidity 74% 71% 88%, 2012 52%, 2013
Minimum Pressure 1032 hPa 18:18 1014 hPa 1032 hPa, 2022 998 hPa, 2020
Maximum Pressure 1034 hPa 10:45 1020 hPa 1034 hPa, 2022 1006 hPa, 2020
Mean Pressure 1033 hPa 1017 hPa 1033 hPa, 2022 1003 hPa, 2020
Mean Wind Speed 2.1 mph (-2.8) 4.7 mph (-0.2) 9.8 mph, 2012 2.1 mph, 2014
Maximum Wind Speed 9.4 mph 13:34 13.1 mph 20.4 mph, 2012 7.8 mph, 2019
Maximum Gust 13.7 mph 13:31 21.7 mph 34.6 mph, 2012 11.5 mph, 2019
Mean Wind Direction NE
Rainfall 0.0 mm 17.8 mm (44%) 16.9 mm, 2012
Maximum Hourly Rain n/a 2.7, 2010
Maximum 10-min Rain n/a 1.4, 2010
Maximum Rain Rate n/a 18, 2015
Minimum Dew Point 2.4 °C 23:51 2.7 °C 6.7 °C, 2014 -3.5 °C, 2015
Maximum Dew Point 5.1 °C 00:49 7.6 °C 13.1 °C, 2012 3.9 °C, 2021
Mean Dew Point 4.0 °C 5.1 °C 8.9 °C, 2010 0.2 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.6 °C 05:58 6.2 °C 11.4 °C, 2010 2.9 °C, 2009
Day Maximum (09-21) 10.6 °C 16:17 14.9 °C 19.5 °C, 2011 7.6 °C, 2018
Max 10m Temp Rise 0.6 °C 07:38 0.7 °C 1.0 °C, 2017 0.2 °C, 2018
Max 1hr Temp Rise 1.7 °C 07:53 2.3 °C 4.1 °C, 2017 0.4 °C, 2018
Max 1hr Hum Rise 5% 18:11 10% 16%, 2016 3%, 2018
Max 10m Temp Fall 0.4 °C 23:16 0.7 °C 2.0 °C, 2016 0.3 °C, 2012
Max 1hr Temp Fall 1.8 °C 23:59 1.8 °C 3.0 °C, 2016 0.6 °C, 2018
Max 1hr Hum Fall 10% 08:25 11% 25%, 2012 4%, 2018
Max 10m Wind Speed 7.5 mph 13:01 10.0 mph 14.6 mph, 2012 5.7 mph, 2019
Minimum Feels-like 4.4 °C 07:31 3.6 °C 11.4 °C, 2010 -0.7 °C, 2021
Maximum Feels-like 10.6 °C 15:13 15.3 °C 21.5 °C, 2011 6.7 °C, 2018
Mean Feels-like 8.0 °C 9.9 °C 15.8 °C, 2010 3.8 °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 5.0 °C (-4.0) 8.7 °C (+0.3) 15.2 °C (+6.2), 2009 1.7 °C (-7.3), 2018
Humidity Range 25% 36% 55%, 2009 11%, 2018
Pressure Range 2 hPa 7 hPa 10 hPa, 2012 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [8%]140 hrs (90%) [39%] 10 [75%], 2009 0 [0%], 2018
Wet Hours 018 hrs (40%) [2.6%] 13, 2012 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 13.5 °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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