Daily Report for 23rd April 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.2 °C (+1.8) 23:55 5.4 °C (-0.5) 11.7 °C (+5.3), 2019 1.7 °C (-4.7), 2021
Maximum Temperature 13.9 °C (-1.2) 17:03 13.5 °C (-0.6) 26.5 °C (+11.4), 2011 9.8 °C (-5.2), 2016
Mean Temperature 10.8 °C (+0.3) 9.3 °C (-0.5) 18.6 °C, 2011 6.7 °C, 2016
Minimum Humidity 66% 18:06 57% 66%, 2023 23%, 2021
Maximum Humidity 92% 01:55 92% 95%, 2012 68%, 2017
Mean Humidity 84% 78% 84%, 2023 52%, 2011
Minimum Pressure 1001 hPa 17:17 1013 hPa 1029 hPa, 2021 990 hPa, 2012
Maximum Pressure 1006 hPa 23:44 1021 hPa 1031 hPa, 2021 1002 hPa, 2012
Mean Pressure 1002 hPa 1017 hPa 1030 hPa, 2021 996 hPa, 2012
Mean Wind Speed 4.8 mph (-0.1) 5.5 mph (+0.6) 7.8 mph, 2018 1.7 mph, 2011
Maximum Wind Speed 14.2 mph 19:34 14.3 mph 21.5 mph, 2012 7.6 mph, 2010
Maximum Gust 19.6 mph 02:42 22.1 mph 28.5 mph, 2022 10.7 mph, 2015
Mean Wind Direction W
Rainfall 4.1 mm 35.5 mm (110%) 4.1 mm, 2023
Maximum Hourly Rain 3.1 mm 14:17 3.1 mm, 2023
Maximum 10-min Rain 2.4 mm 13:55 2.4 mm, 2023
Maximum Rain Rate 30 mm/h 13:49 30 mm/h, 2023
Minimum Dew Point 6.5 °C 19:09 2.8 °C 6.7 °C, 2019 -6.3 °C, 2021
Maximum Dew Point 9.6 °C 16:06 7.7 °C 11.6 °C, 2019 3.5 °C, 2010
Mean Dew Point 8.1 °C 5.4 °C 8.2 °C, 2019 0.1 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.0 °C * 06:53 5.8 °C 11.7 °C, 2019 1.7 °C, 2021
Day Maximum (09-21) 13.9 °C 17:04 13.5 °C 26.5 °C, 2011 9.8 °C, 2016
Max 10m Temp Rise 0.5 °C 15:58 0.6 °C 1.4 °C, 2011 0.5 °C, 2013
Max 1hr Temp Rise 2.3 °C 16:34 2.2 °C 4.9 °C, 2011 1.5 °C, 2022
Max 1hr Hum Rise 10% 19:08 12% 14%, 2012 5%, 2009
Max 10m Temp Fall 0.9 °C 13:58 0.6 °C 1.2 °C, 2009 0.4 °C, 2013
Max 1hr Temp Fall 2.6 °C 19:14 1.9 °C 2.7 °C, 2009 1.3 °C, 2018
Max 1hr Hum Fall 15% 17:07 12% 20%, 2021 5%, 2017
Max 10m Wind Speed 10.8 mph 19:40 11.1 mph 12.3 mph, 2018 7.4 mph, 2020
Minimum Feels-like 6.0 °C 23:07 2.3 °C 11.8 °C, 2019 -0.9 °C, 2016
Maximum Feels-like 14.8 °C 16:58 13.8 °C 26.9 °C, 2011 9.5 °C, 2016
Mean Feels-like 11.0 °C 8.2 °C 19.0 °C, 2011 4.9 °C, 2016
Air-frost Hrs 0 hrs 0.0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.7 °C (-3.0) 8.1 °C (-0.1) 16.4 °C (+7.7), 2011 3.9 °C (-4.8), 2012
Humidity Range 26% 34% 69%, 2021 25%, 2017
Pressure Range 5 hPa 8 hPa 12 hPa, 2012 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [15%]122 hrs (100%) [43%] 13 [100%], 2010 0 [0%], 2019
Wet Hours 4
[Mean rain rate: 1.0 mm/h]
46 hrs (130%) [8.3%] 7, 2012 0, 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 11.7 °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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