Daily Report for 12th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.6 °C (-4.6) 21:02 0.9 °C (-1.4) 5.6 °C (+3.6), 2011 -5.7 °C (-7.7), 2012
Maximum Temperature 0.9 °C (-6.2) 11:38 4.8 °C (-2.3) 11.1 °C (+4.0), 2019 0.9 °C (-6.2), 2021
Mean Temperature -0.9 °C (-5.4) 3.1 °C (-1.9) 8.9 °C, 2011 -0.9 °C, 2021
Minimum Humidity 63% 11:41 77% 80%, 2012 58%, 2009
Maximum Humidity 78% 01:58 92% 98%, 2013 76%, 2015
Mean Humidity 71% 85% 88%, 2010 71%, 2021
Minimum Pressure 1029 hPa 00:20 1006 hPa 1033 hPa, 2019 985 hPa, 2014
Maximum Pressure 1034 hPa 22:43 1013 hPa 1036 hPa, 2012 1000 hPa, 2016
Mean Pressure 1032 hPa 1009 hPa 1034 hPa, 2012 993 hPa, 2014
Mean Wind Speed 6.5 mph (+1.4) 5.0 mph (-0.1) 10.2 mph, 2014 1.0 mph, 2012
Maximum Wind Speed 15.5 mph 21:51 13.4 mph 29.7 mph, 2014 6.9 mph, 2012
Maximum Gust 25.1 mph 21:50 20.9 mph 47.8 mph, 2014 10.2 mph, 2012
Mean Wind Direction ESE
Rainfall 0.0 mm 31.3 mm (178%) 6.7 mm, 2014
Maximum Hourly Rain n/a 3.7, 2014
Maximum 10-min Rain n/a 1.2, 2014
Maximum Rain Rate n/a 9, 2014
Minimum Dew Point -7.1 °C 17:15 -1.1 °C 2.6 °C, 2011 -8.5 °C, 2012
Maximum Dew Point -4.3 °C 08:23 2.5 °C 9.7 °C, 2011 -4.3 °C, 2021
Mean Dew Point -5.5 °C 0.9 °C 6.5 °C, 2011 -5.5 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * -1.4 °C * 04:01 1.6 °C 8.7 °C, 2011 -5.7 °C, 2012
Day Maximum (09-21) 0.9 °C 11:38 4.6 °C 11.1 °C, 2019 0.9 °C, 2021
Max 10m Temp Rise 0.7 °C 22:02 0.4 °C 0.7 °C, 2021 0.1 °C, 2013
Max 1hr Temp Rise 1.1 °C 22:02 1.1 °C 2.1 °C, 2019 0.3 °C, 2013
Max 1hr Hum Rise 6% 20:07 6% 18%, 2009 1%, 2013
Max 10m Temp Fall 1.1 °C 19:52 0.4 °C 1.1 °C, 2021 0.1 °C, 2013
Max 1hr Temp Fall 1.4 °C 20:43 0.9 °C 1.8 °C, 2009 0.3 °C, 2013
Max 1hr Hum Fall 8% 09:20 7% 18%, 2014 3%, 2015
Max 10m Wind Speed 12.5 mph 11:00 10.5 mph 22.2 mph, 2014 4.4 mph, 2012
Minimum Feels-like -10.4 °C 21:07 -4.3 °C 1.9 °C, 2011 -10.4 °C, 2021
Maximum Feels-like -2.0 °C 14:17 4.0 °C 11.7 °C, 2011 -2.0 °C, 2021
Mean Feels-like -5.8 °C 0.2 °C 7.9 °C, 2011 -5.8 °C, 2021
Air-frost Hrs 20 hrs 9 hrs 20 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.5 °C (-1.6) 4.0 °C (-1.0) 10.1 °C (+5.0), 2012 1.1 °C (-4.0), 2015
Humidity Range 15% 15% 38%, 2009 8%, 2015
Pressure Range 5 hPa 6 hPa 18 hPa, 2014 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [46%]15 hrs (49%) [15%] 6 [69%], 2018 0 [0%], 2012
Wet Hours 039 hrs (175%) [14%] 3.5, 2014 , 2009
Cloud Cover unknown
Events Air Frost
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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Wind rose