Daily Report for 27th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.7 °C (-0.9) 06:20 3.4 °C (+1.2) 6.5 °C (+3.9), 2009 -4.3 °C (-6.9), 2018
Maximum Temperature 11.5 °C (+2.8) 14:37 8.4 °C (+0.8) 16.9 °C (+8.2), 2019 -0.1 °C (-8.8), 2018
Mean Temperature 6.6 °C (+1.0) 6.1 °C (+1.0) 10.2 °C, 2009 -2.4 °C, 2018
Minimum Humidity 62% 14:45 72% 76%, 2010 47%, 2016
Maximum Humidity 93% 08:01 90% 98%, 2013 74%, 2016
Mean Humidity 79% 82% 89%, 2010 61%, 2016
Minimum Pressure 1041 hPa 00:53 1012 hPa 1041 hPa, 2021 982 hPa, 2017
Maximum Pressure 1043 hPa 09:49 1019 hPa 1043 hPa, 2021 999 hPa, 2017
Mean Pressure 1042 hPa 1015 hPa 1042 hPa, 2021 989 hPa, 2017
Mean Wind Speed 0.7 mph (-4.4) 5.7 mph (+0.6) 7.6 mph, 2017 0.7 mph, 2021
Maximum Wind Speed 6.4 mph 15:35 14.3 mph 18.9 mph, 2017 6.4 mph, 2021
Maximum Gust 9.1 mph 11:43 21.9 mph 27.6 mph, 2020 9.1 mph, 2021
Mean Wind Direction NNW
Rainfall 0.0 mm 40.3 mm (102%) 9.1 mm, 2017
Maximum Hourly Rain n/a 5.6, 2017
Maximum 10-min Rain n/a 2, 2017
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 0.2 °C 06:13 0.9 °C 3.7 °C, 2009 -8.3 °C, 2018
Maximum Dew Point 5.5 °C 11:43 5.1 °C 7.9 °C, 2010 -3.7 °C, 2018
Mean Dew Point 3.0 °C 3.2 °C 5.9 °C, 2012 -5.9 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.7 °C 06:20 4.1 °C 8.2 °C, 2017 -4.1 °C, 2018
Day Maximum (09-21) 11.5 °C 14:36 8.2 °C 16.9 °C, 2019 -0.1 °C, 2018
Max 10m Temp Rise 0.7 °C 08:40 0.4 °C 1.0 °C, 2019 0.3 °C, 2012
Max 1hr Temp Rise 3.4 °C 08:57 1.3 °C 4.3 °C, 2019 0.8 °C, 2017
Max 1hr Hum Rise 9% 18:13 6% 19%, 2018 4%, 2016
Max 10m Temp Fall 0.4 °C 12:45 0.3 °C 1.1 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 1.7 °C 20:57 1.0 °C 2.5 °C, 2019 0.5 °C, 2012
Max 1hr Hum Fall 12% 09:16 7% 15%, 2014 4%, 2012
Max 10m Wind Speed 4.5 mph 15:40 11.3 mph 14.4 mph, 2017 4.5 mph, 2021
Minimum Feels-like 1.1 °C 03:55 -0.4 °C 3.2 °C, 2012 -10.3 °C, 2018
Maximum Feels-like 11.5 °C 14:08 8.1 °C 17.1 °C, 2019 -1.1 °C, 2018
Mean Feels-like 6.6 °C 4.1 °C 9.8 °C, 2019 -6.4 °C, 2018
Air-frost Hrs 0 hrs 5 hrs 24 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.8 °C (+3.7) 5.0 °C (-0.4) 14.7 °C (+8.6), 2019 3.2 °C (-2.9), 2016
Humidity Range 31% 18% 48%, 2014 11%, 2017
Pressure Range 2 hPa 6 hPa 20 hPa, 2020 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 9 [94%]50 hrs (69%) [21%] 9.6 [100%], 2019 0 [0%], 2012
Wet Hours 057 hrs (114%) [8.8%] 8, 2020 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
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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