Daily Report for 16th March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.0 °C (+3.4) 00:36 3.6 °C (+0.5) 8.3 °C (+4.7), 2012 3.4 °C (-0.2), 2009
Maximum Temperature 13.9 °C (+3.6) 16:52 9.0 °C (-0.6) 18.3 °C (+8.0), 2014 7.8 °C (-2.5), 2013
Mean Temperature 9.5 °C (+3.5) 6.2 °C (-0.1) 13.1 °C, 2014 6.3 °C, 2015
Minimum Humidity 70% 18:42 67% 82%, 2011 36%, 2014
Maximum Humidity 90% 08:44 90% 98%, 2011 71%, 2010
Mean Humidity 80% 80% 92%, 2011 58%, 2010
Minimum Pressure 1026 hPa 06:04 1016 hPa 1030 hPa, 2009 992 hPa, 2013
Maximum Pressure 1034 hPa 23:55 1025 hPa 1034 hPa, 2021 1001 hPa, 2013
Mean Pressure 1029 hPa 1021 hPa 1032 hPa, 2009 995 hPa, 2013
Mean Wind Speed 5.2 mph (+0.0) 5.7 mph (+0.5) 12.8 mph, 2019 3.8 mph, 2020
Maximum Wind Speed 15.4 mph 10:19 14.3 mph 27.1 mph, 2019 9.2 mph, 2010
Maximum Gust 26.2 mph 10:19 21.3 mph 44.9 mph, 2019 13.2 mph, 2010
Mean Wind Direction NNW
Rainfall 0.2 mm 15.9 mm (73%) 4.6 mm, 2013
Maximum Hourly Rain 0.2 mm 1.8 mm, 2019
Maximum 10-min Rain 0.2 mm 1.5 mm, 2018
Maximum Rain Rate n/a 26, 2018
Minimum Dew Point 3.3 °C 23:43 0.8 °C 5.6 °C, 2019 -3.0 °C, 2010
Maximum Dew Point 9.9 °C 15:23 5.0 °C 9.9 °C, 2021 2.1 °C, 2010
Mean Dew Point 6.2 °C 2.9 °C 7.7 °C, 2019 -0.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.0 °C 00:43 3.9 °C 10.3 °C, 2019 3.4 °C, 2009
Day Maximum (09-21) 13.9 °C 16:52 9.0 °C 18.3 °C, 2014 7.8 °C, 2013
Max 10m Temp Rise 0.6 °C 10:22 0.4 °C 1.3 °C, 2009 0.1 °C, 2012
Max 1hr Temp Rise 2.6 °C 10:39 1.4 °C 3.5 °C, 2009 0.4 °C, 2012
Max 1hr Hum Rise 5% 12:39 8% 16%, 2018 3%, 2011
Max 10m Temp Fall 1.1 °C 17:29 0.5 °C 1.3 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 3.3 °C 18:19 1.5 °C 3.3 °C, 2021 0.4 °C, 2012
Max 1hr Hum Fall 12% 10:33 9% 22%, 2014 4%, 2012
Max 10m Wind Speed 10.8 mph 10:26 10.7 mph 20.4 mph, 2019 6.2 mph, 2010
Minimum Feels-like 3.1 °C 23:26 -0.0 °C 5.9 °C, 2014 0.2 °C, 2020
Maximum Feels-like 15.0 °C 16:52 9.0 °C 18.3 °C, 2014 6.2 °C, 2013
Mean Feels-like 8.7 °C 4.4 °C 12.7 °C, 2014 3.0 °C, 2013
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 6.9 °C (+0.2) 5.4 °C (-1.2) 13.0 °C (+6.3), 2009 1.5 °C (-5.2), 2012
Humidity Range 20% 23% 47%, 2009 11%, 2012
Pressure Range 7 hPa 9 hPa 15 hPa, 2019 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.3 [12%]38 hrs (72%) [23%] 10.7 [100%], 2014 0 [0%], 2011
Wet Hours 0.520 hrs (73%) [5.2%] 8, 2013 , 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments possible early rn
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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Wind rose