Daily Report for 1st March 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.6 °C (+1.0) 02:57 3.6 °C (+1.0) 8.0 °C (+5.4), 2019 -4.8 °C (-7.4), 2018
Maximum Temperature 8.6 °C (-0.2) 13:42 8.6 °C (-0.3) 14.4 °C (+5.6), 2012 0.0 °C (-8.8), 2018
Mean Temperature 5.4 °C (+0.4) 5.4 °C (+0.3) 9.9 °C, 2012 -2.8 °C, 2018
Minimum Humidity 76% 13:18 76% 76%, 2021 47%, 2015
Maximum Humidity 95% 04:19 95% 98%, 2014 84%, 2017
Mean Humidity 87% 87% 87%, 2021 68%, 2015
Minimum Pressure 1032 hPa 16:59 1032 hPa 1035 hPa, 2011 988 hPa, 2020
Maximum Pressure 1035 hPa 00:02 1035 hPa 1039 hPa, 2011 991 hPa, 2020
Mean Pressure 1033 hPa 1033 hPa 1037 hPa, 2011 990 hPa, 2020
Mean Wind Speed 2.7 mph (-2.5) 2.7 mph (-2.5) 12.5 mph, 2018 1.9 mph, 2014
Maximum Wind Speed 9.4 mph 14:19 9.4 mph 22.0 mph, 2018 7.1 mph, 2012
Maximum Gust 13.7 mph 11:46 13.7 mph 33.4 mph, 2018 8.7 mph, 2012
Mean Wind Direction ENE
Rainfall 0.0 mm 0.0 mm (0%) 5.7 mm, 2016
Maximum Hourly Rain n/a 3.2, 2015
Maximum 10-min Rain n/a 2.6, 2015
Maximum Rain Rate n/a 30, 2015
Minimum Dew Point 1.7 °C 23:55 1.7 °C 5.4 °C, 2019 -8.4 °C, 2018
Maximum Dew Point 5.2 °C 13:31 5.2 °C 10.7 °C, 2016 -3.6 °C, 2018
Mean Dew Point 3.3 °C 3.3 °C 6.7 °C, 2019 -5.8 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.6 °C 02:58 3.6 °C 8.1 °C, 2019 -5.1 °C, 2018
Day Maximum (09-21) 8.6 °C 13:26 8.6 °C 14.4 °C, 2012 0.0 °C, 2018
Max 10m Temp Rise 0.5 °C 11:53 0.5 °C 0.6 °C, 2011 0.3 °C, 2013
Max 1hr Temp Rise 1.2 °C 13:08 1.2 °C 2.1 °C, 2010 0.4 °C, 2011
Max 1hr Hum Rise 4% 17:44 4% 21%, 2015 3%, 2019
Max 10m Temp Fall 0.4 °C 17:25 0.4 °C 0.8 °C, 2015 0.2 °C, 2013
Max 1hr Temp Fall 1.4 °C 17:32 1.4 °C 2.4 °C, 2015 0.7 °C, 2013
Max 1hr Hum Fall 6% 10:21 6% 24%, 2015 5%, 2016
Max 10m Wind Speed 6.5 mph 14:19 6.5 mph 18.1 mph, 2015 5.7 mph, 2014
Minimum Feels-like 0.0 °C 03:48 0.0 °C 5.0 °C, 2012 -14.2 °C, 2018
Maximum Feels-like 8.4 °C 13:27 8.4 °C 14.6 °C, 2012 -5.7 °C, 2018
Mean Feels-like 3.6 °C 3.6 °C 9.8 °C, 2012 -10.1 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 24 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.0 °C (-1.2) 5.0 °C (-1.3) 9.5 °C (+3.3), 2010 1.9 °C (-4.3), 2011
Humidity Range 19% 19% 49%, 2015 13%, 2011
Pressure Range 4 hPa 4 hPa 21 hPa, 2016 3 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.4 [55%]5.4 hrs (172%) [55%] 9 [92%], 2012 0 [0%], 2011
Wet Hours 00 hrs (0%) [0%] 5, 2018 , 2009
Cloud Cover am: Overcast transitioned to Mostly Cloudy
pm: Mostly 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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