Daily Report for 25th March 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.7 °C (+2.8) 02:30 4.6 °C (+0.5) 8.1 °C (+3.2), 2010 0.0 °C (-4.9), 2013
Maximum Temperature 14.3 °C (+2.4) 15:19 10.4 °C (-0.4) 17.2 °C (+5.3), 2011 1.1 °C (-10.8), 2013
Mean Temperature 10.7 °C (+2.6) 7.4 °C (+0.0) 11.2 °C, 2010 0.6 °C, 2013
Minimum Humidity 58% 16:20 71% 79%, 2010 21%, 2017
Maximum Humidity 87% 02:10 92% 95%, 2010 68%, 2013
Mean Humidity 76% 84% 90%, 2010 50%, 2017
Minimum Pressure 1000 hPa 00:00 1004 hPa 1032 hPa, 2022 996 hPa, 2010
Maximum Pressure 1008 hPa 19:13 1013 hPa 1036 hPa, 2019 1003 hPa, 2010
Mean Pressure 1004 hPa 1009 hPa 1034 hPa, 2012 1000 hPa, 2010
Mean Wind Speed 9.4 mph (+4.2) 6.3 mph (+1.1) 9.8 mph, 2013 1.6 mph, 2011
Maximum Wind Speed 22.1 mph 11:04 15.7 mph 22.1 mph, 2023 7.1 mph, 2011
Maximum Gust 33.4 mph 10:03 23.6 mph 33.4 mph, 2023 8.7 mph, 2011
Mean Wind Direction W
Rainfall 0.0 mm 54.5 mm (173%) 4.9 mm, 2009
Maximum Hourly Rain n/a 2.3, 2009
Maximum 10-min Rain n/a 2.3, 2009
Maximum Rain Rate n/a 16, 2010
Minimum Dew Point 5.1 °C 02:46 2.6 °C 6.2 °C, 2010 -9.4 °C, 2017
Maximum Dew Point 8.3 °C 12:58 7.3 °C 11.8 °C, 2010 -4.4 °C, 2013
Mean Dew Point 6.5 °C 4.8 °C 9.7 °C, 2010 -5.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.7 °C 02:32 4.8 °C 10.7 °C, 2010 0.0 °C, 2013
Day Maximum (09-21) 14.3 °C 14:57 10.1 °C 17.2 °C, 2011 1.1 °C, 2013
Max 10m Temp Rise 0.5 °C 12:06 0.5 °C 1.3 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 1.4 °C 10:06 1.5 °C 4.5 °C, 2020 0.3 °C, 2013
Max 1hr Hum Rise 8% 17:20 8% 10%, 2019 4%, 2013
Max 10m Temp Fall 0.5 °C 13:05 0.5 °C 1.0 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 1.3 °C 16:53 1.3 °C 2.7 °C, 2015 0.3 °C, 2013
Max 1hr Hum Fall 10% 10:21 8% 19%, 2017 4%, 2013
Max 10m Wind Speed 15.2 mph 10:48 11.8 mph 15.2 mph, 2023 4.8 mph, 2011
Minimum Feels-like 2.7 °C 04:04 1.3 °C 5.0 °C, 2010 -7.0 °C, 2013
Maximum Feels-like 14.5 °C 14:30 10.7 °C 17.2 °C, 2011 -2.0 °C, 2013
Mean Feels-like 9.4 °C 6.1 °C 12.0 °C, 2010 -4.7 °C, 2013
Air-frost Hrs 0 hrs 0.7 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.6 °C (-0.4) 5.7 °C (-0.8) 13.6 °C (+6.6), 2011 1.1 °C (-5.9), 2013
Humidity Range 29% 21% 59%, 2017 10%, 2013
Pressure Range 8 hPa 9 hPa 12 hPa, 2009 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [54%]47 hrs (52%) [18%] 11.3 [101%], 2020 0 [0%], 2013
Wet Hours 075 hrs (175%) [13%] 5, 2014 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 9.4 °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