Daily Report for 4th April 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.2 °C (-0.3) 06:54 1.1 °C (-4.3) 11.1 °C (+5.6), 2014 0.1 °C (-5.4), 2013
Maximum Temperature 14.3 °C (+1.1) 17:50 9.8 °C (-3.4) 17.3 °C (+4.1), 2009 2.7 °C (-10.6), 2013
Mean Temperature 9.5 °C (+0.4) 5.4 °C (-3.9) 12.9 °C, 2014 1.6 °C, 2013
Minimum Humidity 70% 00:05 53% 71%, 2015 38%, 2009
Maximum Humidity 92% 11:11 88% 95%, 2015 80%, 2017
Mean Humidity 83% 74% 83%, 2018 67%, 2020
Minimum Pressure 1010 hPa 17:38 1017 hPa 1021 hPa, 2017 993 hPa, 2018
Maximum Pressure 1022 hPa 00:00 1025 hPa 1033 hPa, 2021 1000 hPa, 2019
Mean Pressure 1014 hPa 1020 hPa 1026 hPa, 2021 995 hPa, 2018
Mean Wind Speed 8.7 mph (+3.8) 5.2 mph (+0.3) 9.4 mph, 2013 3.0 mph, 2017
Maximum Wind Speed 14.9 mph 13:51 13.8 mph 20.9 mph, 2018 8.2 mph, 2017
Maximum Gust 26.2 mph 13:52 23.1 mph 35.6 mph, 2018 12.6 mph, 2017
Mean Wind Direction W
Rainfall 3.8 mm 3.8 mm (68%) 3.8 mm, 2022
Maximum Hourly Rain 1.5 mm 06:20 1.5 mm, 2022
Maximum 10-min Rain 0.7 mm 05:49 0.7 mm, 2022
Maximum Rain Rate 7 mm/h 05:43 7 mm/h, 2022
Minimum Dew Point 0.8 °C 00:05 -2.5 °C 5.8 °C, 2016 -6.7 °C, 2013
Maximum Dew Point 10.7 °C 17:13 3.7 °C 10.7 °C, 2022 0.9 °C, 2013
Mean Dew Point 6.6 °C 0.9 °C 7.7 °C, 2014 -3.2 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.2 °C 06:55 1.1 °C 11.5 °C, 2014 0.1 °C, 2013
Day Maximum (09-21) 14.3 °C 17:49 9.8 °C 17.3 °C, 2009 2.7 °C, 2013
Max 10m Temp Rise 0.4 °C 12:18 0.8 °C 1.3 °C, 2020 0.3 °C, 2014
Max 1hr Temp Rise 1.7 °C 15:15 2.4 °C 4.0 °C, 2020 0.5 °C, 2015
Max 1hr Hum Rise 5% 05:02 12% 15%, 2019 3%, 2015
Max 10m Temp Fall 0.3 °C 04:56 1.2 °C 0.9 °C, 2019 0.3 °C, 2015
Max 1hr Temp Fall 0.7 °C 05:46 1.5 °C 2.1 °C, 2019 0.7 °C, 2013
Max 1hr Hum Fall 8% 15:12 12% 16%, 2013 4%, 2017
Max 10m Wind Speed 12.6 mph 05:32 10.6 mph 15.2 mph, 2018 6.1 mph, 2017
Minimum Feels-like -0.1 °C 06:33 -3.2 °C 11.1 °C, 2014 -5.3 °C, 2013
Maximum Feels-like 15.8 °C 17:35 9.9 °C 16.6 °C, 2020 0.1 °C, 2013
Mean Feels-like 8.1 °C 3.4 °C 13.4 °C, 2014 -3.1 °C, 2013
Air-frost Hrs 0 hrs 1 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.1 °C (+1.3) 8.7 °C (+0.9) 14.2 °C (+6.4), 2020 2.6 °C (-5.2), 2013
Humidity Range 22% 35% 57%, 2020 13%, 2017
Pressure Range 12 hPa 8 hPa 21 hPa, 2010 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]13 hrs (65%) [28%] 10.4 [88%], 2020 0 [0%], 2013
Wet Hours 7
[Mean rain rate: 0.5 mm/h]
7 hrs (114%) [7.3%] 7, 2022 0, 2011
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 8.5 °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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