Daily Report for 15th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.2 °C (+2.4) 00:00 0.8 °C (-1.4) 9.9 °C (+8.1), 2020 -1.7 °C (-3.5), 2010
Maximum Temperature 11.9 °C (+4.6) 15:02 5.1 °C (-2.2) 13.5 °C (+6.2), 2019 3.4 °C (-3.9), 2010
Mean Temperature 8.5 °C (+3.5) 3.2 °C (-1.8) 11.5 °C, 2020 1.3 °C, 2010
Minimum Humidity 76% 15:21 74% 83%, 2020 52%, 2013
Maximum Humidity 95% 10:47 91% 97%, 2010 79%, 2014
Mean Humidity 89% 83% 90%, 2020 66%, 2014
Minimum Pressure 1016 hPa 23:12 1010 hPa 1026 hPa, 2009 977 hPa, 2014
Maximum Pressure 1021 hPa 00:07 1016 hPa 1034 hPa, 2016 998 hPa, 2011
Mean Pressure 1019 hPa 1013 hPa 1028 hPa, 2009 988 hPa, 2014
Mean Wind Speed 6.1 mph (+1.0) 5.5 mph (+0.4) 13.3 mph, 2014 2.2 mph, 2010
Maximum Wind Speed 14.9 mph 13:12 13.7 mph 32.4 mph, 2014 7.4 mph, 2010
Maximum Gust 20.5 mph 13:12 21.4 mph 47.8 mph, 2014 10.9 mph, 2010
Mean Wind Direction SW
Rainfall 3.1 mm 35.6 mm (162%) 4.9 mm, 2020
Maximum Hourly Rain 0.7 mm 02:59 1.1 mm, 2020
Maximum 10-min Rain 0.5 mm 04:56 0.5 mm, 2011
Maximum Rain Rate 2.1 mm/h 04:56 18 mm/h, 2020
Minimum Dew Point 2.1 °C 00:00 -1.7 °C 8.5 °C, 2020 -4.6 °C, 2009
Maximum Dew Point 9.3 °C 12:49 2.4 °C 10.8 °C, 2020 0.1 °C, 2016
Mean Dew Point 6.8 °C 0.5 °C 9.8 °C, 2020 -1.4 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 3.7 °C * 21:40 1.3 °C 9.9 °C, 2020 -1.7 °C, 2010
Day Maximum (09-21) 11.9 °C 15:03 4.9 °C 13.5 °C, 2019 3.0 °C, 2010
Max 10m Temp Rise 0.4 °C 11:55 0.4 °C 0.9 °C, 2019 0.2 °C, 2011
Max 1hr Temp Rise 1.3 °C 14:06 1.1 °C 3.5 °C, 2019 0.5 °C, 2020
Max 1hr Hum Rise 4% 16:21 6% 13%, 2009 3%, 2017
Max 10m Temp Fall 0.3 °C 16:06 0.3 °C 1.2 °C, 2018 0.2 °C, 2010
Max 1hr Temp Fall 0.9 °C 16:48 0.9 °C 2.1 °C, 2015 0.6 °C, 2012
Max 1hr Hum Fall 11% 14:10 7% 18%, 2018 4%, 2009
Max 10m Wind Speed 12.0 mph 13:15 10.7 mph 23.1 mph, 2014 5.2 mph, 2010
Minimum Feels-like -0.8 °C 00:03 -4.7 °C 6.7 °C, 2020 -4.2 °C, 2016
Maximum Feels-like 12.5 °C 14:33 4.1 °C 14.1 °C, 2020 2.4 °C, 2016
Mean Feels-like 6.7 °C 0.0 °C 12.6 °C, 2020 -1.1 °C, 2016
Air-frost Hrs 0 hrs 8 hrs 6 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.7 °C (+2.2) 4.3 °C (-0.8) 13.0 °C (+7.5), 2019 1.9 °C (-3.6), 2011
Humidity Range 19% 17% 44%, 2018 8%, 2017
Pressure Range 5 hPa 7 hPa 25 hPa, 2014 4 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [22%]20 hrs (52%) [16%] 9 [101%], 2019 0 [0%], 2009
Wet Hours 6
[Mean rain rate: 0.5 mm/h]
47 hrs (169%) [13%] 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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Webcam Summary of Cloud Conditions

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