Daily Report for 7th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -1.5 °C (-3.9) 23:32 3.3 °C (+0.9) 6.6 °C (+4.2), 2019 -3.9 °C (-6.2), 2012
Maximum Temperature 3.4 °C (-3.9) 00:07 8.1 °C (+0.8) 11.4 °C (+4.1), 2011 2.1 °C (-5.2), 2012
Mean Temperature 1.0 °C (-3.9) 6.1 °C (+0.9) 9.0 °C, 2011 0.0 °C, 2012
Minimum Humidity 80% 23:14 82% 90%, 2010 54%, 2013
Maximum Humidity 93% 00:46 95% 98%, 2010 84%, 2011
Mean Humidity 86% 89% 96%, 2010 68%, 2013
Minimum Pressure 1004 hPa 16:00 1001 hPa 1035 hPa, 2012 977 hPa, 2014
Maximum Pressure 1006 hPa 09:00 1007 hPa 1043 hPa, 2012 994 hPa, 2016
Mean Pressure 1005 hPa 1003 hPa 1039 hPa, 2012 989 hPa, 2014
Mean Wind Speed 11.5 mph (+6.4) 4.6 mph (-0.5) 11.5 mph, 2021 2.3 mph, 2017
Maximum Wind Speed 19.8 mph 08:00 13.3 mph 25.9 mph, 2016 8.5 mph, 2017
Maximum Gust 33.1 mph 12:22 20.2 mph 39.2 mph, 2019 12.6 mph, 2017
Mean Wind Direction NE
Rainfall / Snow-melt approx. 1.0 mm 26.8 mm (261%) 13.0 mm, 2016
Maximum Hourly Rain n/a 10.7, 2016
Maximum 10-min Rain n/a 5.5, 2016
Maximum Rain Rate n/a 162, 2016
Minimum Dew Point -4.4 °C 23:20 1.7 °C 2.5 °C, 2019 -10.4 °C, 2012
Maximum Dew Point 2.4 °C 00:07 6.3 °C 9.3 °C, 2014 -0.2 °C, 2018
Mean Dew Point -1.1 °C 4.4 °C 4.6 °C, 2011 -4.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 0.9 °C * 08:59 4.3 °C 8.7 °C, 2011 -2.4 °C, 2009
Day Maximum (09-21) * 0.9 °C * 12:35 7.7 °C 11.4 °C, 2011 0.9 °C, 2021
Max 10m Temp Rise 0.3 °C 11:26 0.4 °C 0.6 °C, 2020 0.2 °C, 2010
Max 1hr Temp Rise 0.5 °C 12:13 1.3 °C 2.3 °C, 2020 0.4 °C, 2010
Max 1hr Hum Rise 7% 18:18 5% 12%, 2016 3%, 2010
Max 10m Temp Fall 0.5 °C 18:10 0.3 °C 1.5 °C, 2014 0.3 °C, 2010
Max 1hr Temp Fall 1.2 °C 09:02 1.0 °C 4.5 °C, 2014 0.7 °C, 2020
Max 1hr Hum Fall 7% 20:47 6% 21%, 2011 4%, 2010
Max 10m Wind Speed 16.1 mph 13:20 10.2 mph 18.1 mph, 2016 7.2 mph, 2017
Minimum Feels-like -9.7 °C 23:26 -1.0 °C 3.2 °C, 2011 -10.7 °C, 2012
Maximum Feels-like 0.5 °C 00:05 7.8 °C 11.8 °C, 2011 0.5 °C, 2021
Mean Feels-like -5.1 °C 4.2 °C 7.1 °C, 2011 -5.1 °C, 2021
Air-frost Hrs 6 hrs 0.8 hrs 11 hrs, 2009 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.9 °C (-0.1) 4.8 °C (-0.1) 9.3 °C (+4.3), 2020 2.2 °C (-2.8), 2010
Humidity Range 13% 14% 40%, 2012 8%, 2010
Pressure Range 2 hPa 7 hPa 19 hPa, 2014 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]1.5 hrs (8%) [2.6%] 7 [83%], 2020 0 [0%], 2021
Wet Hours 8
[Mean rain rate: 0.1 mm/h]
31 hrs (238%) [18%] 8, 2021 , 2009
Cloud Cover Overcast
Events Snowfall: ~1 cm
Lying Snow (at 09z): ~0.5 cm
Comments periods of Light snow or snizzle, chiefly 00-06
Extra Comments trace of lying s
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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose