Daily Report for 23rd March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (-1.3) 04:33 3.6 °C (+0.3) 6.4 °C (+2.3), 2018 0.4 °C (-3.7), 2013
Maximum Temperature 12.6 °C (+1.7) 15:09 9.6 °C (-0.4) 19.5 °C (+8.6), 2012 2.6 °C (-8.3), 2013
Mean Temperature 7.7 °C (+0.2) 6.6 °C (-0.1) 12.5 °C, 2012 0.9 °C, 2013
Minimum Humidity 61% 15:11 66% 89%, 2013 38%, 2012
Maximum Humidity 94% 05:01 90% 98%, 2010 76%, 2020
Mean Humidity 78% 80% 96%, 2013 64%, 2020
Minimum Pressure 1023 hPa 16:50 1019 hPa 1038 hPa, 2011 998 hPa, 2018
Maximum Pressure 1027 hPa 00:00 1027 hPa 1042 hPa, 2011 1011 hPa, 2018
Mean Pressure 1025 hPa 1023 hPa 1040 hPa, 2011 1002 hPa, 2018
Mean Wind Speed 4.9 mph (-0.3) 5.1 mph (-0.1) 7.9 mph, 2013 1.8 mph, 2016
Maximum Wind Speed 16.5 mph 12:59 13.9 mph 17.5 mph, 2018 5.8 mph, 2016
Maximum Gust 22.8 mph 13:00 20.8 mph 30.0 mph, 2018 8.7 mph, 2012
Mean Wind Direction WSW
Rainfall 0.0 mm 17.7 mm (57%) 6.8 mm, 2013
Maximum Hourly Rain n/a 1.4, 2010
Maximum 10-min Rain n/a 0.5, 2009
Maximum Rain Rate n/a 3, 2017
Minimum Dew Point 1.4 °C 04:14 1.0 °C 4.1 °C, 2012 -3.4 °C, 2014
Maximum Dew Point 5.7 °C 13:38 5.4 °C 9.7 °C, 2012 1.1 °C, 2013
Mean Dew Point 3.9 °C 3.2 °C 6.5 °C, 2012 -0.1 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.8 °C 04:32 4.0 °C 8.8 °C, 2019 0.4 °C, 2013
Day Maximum (09-21) 12.6 °C 15:18 9.6 °C 19.5 °C, 2012 0.9 °C, 2013
Max 10m Temp Rise 0.4 °C 04:48 0.5 °C 0.8 °C, 2009 0.1 °C, 2013
Max 1hr Temp Rise 1.9 °C 09:34 1.4 °C 3.8 °C, 2011 0.3 °C, 2013
Max 1hr Hum Rise 6% 20:32 7% 15%, 2015 3%, 2013
Max 10m Temp Fall 0.3 °C 18:18 0.5 °C 1.1 °C, 2014 0.2 °C, 2010
Max 1hr Temp Fall 1.3 °C 18:59 1.5 °C 2.8 °C, 2009 0.7 °C, 2013
Max 1hr Hum Fall 8% 09:29 8% 19%, 2018 1%, 2013
Max 10m Wind Speed 12.1 mph 13:07 10.4 mph 13.1 mph, 2018 3.9 mph, 2016
Minimum Feels-like 2.5 °C 01:29 0.6 °C 5.2 °C, 2012 -6.1 °C, 2013
Maximum Feels-like 12.6 °C 14:56 9.6 °C 19.5 °C, 2012 1.0 °C, 2013
Mean Feels-like 6.8 °C 4.9 °C 12.5 °C, 2012 -3.4 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.8 °C (+3.0) 5.9 °C (-0.7) 13.9 °C (+7.1), 2012 2.2 °C (-4.6), 2013
Humidity Range 33% 24% 56%, 2012 9%, 2013
Pressure Range 4 hPa 8 hPa 17 hPa, 2009 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.5 [41%]64 hrs (83%) [26%] 11.2 [101%], 2020 0 [0%], 2013
Wet Hours 023 hrs (58%) [4.2%] 18, 2013 , 2009
Cloud Cover am: Mostly Cloudy
pm: Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.5 °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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