Daily Report for 16th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+6.0) 21:11 1.2 °C (-0.9) 7.8 °C (+6.0), 2021 -2.1 °C (-3.9), 2016
Maximum Temperature 10.3 °C (+2.9) 16:24 5.4 °C (-1.8) 13.0 °C (+5.6), 2020 4.4 °C (-3.0), 2010
Mean Temperature 9.3 °C (+4.5) 3.5 °C (-1.4) 9.7 °C, 2019 3.0 °C, 2016
Minimum Humidity 84% 03:12 75% 94%, 2010 48%, 2013
Maximum Humidity 93% 10:57 91% 98%, 2010 83%, 2012
Mean Humidity 89% 83% 96%, 2010 66%, 2013
Minimum Pressure 1008 hPa 16:17 1010 hPa 1028 hPa, 2017 991 hPa, 2010
Maximum Pressure 1017 hPa 00:12 1016 hPa 1035 hPa, 2016 998 hPa, 2010
Mean Pressure 1011 hPa 1013 hPa 1032 hPa, 2016 994 hPa, 2010
Mean Wind Speed 7.4 mph (+2.3) 5.6 mph (+0.5) 12.6 mph, 2020 1.9 mph, 2013
Maximum Wind Speed 13.9 mph 00:13 13.7 mph 29.7 mph, 2020 6.7 mph, 2013
Maximum Gust 21.7 mph 06:23 21.5 mph 49.5 mph, 2020 8.7 mph, 2013
Mean Wind Direction SW
Rainfall 1.7 mm 37.3 mm (159%) 27.0 mm, 2010
Maximum Hourly Rain 1.0 mm 09:54 3.6 mm, 2010
Maximum 10-min Rain 0.5 mm 17:51 2.2 mm, 2020
Maximum Rain Rate 2.1 mm/h 09:09 42 mm/h, 2020
Minimum Dew Point 6.2 °C 20:50 -1.2 °C 6.2 °C, 2021 -4.0 °C, 2016
Maximum Dew Point 8.6 °C 00:14 2.8 °C 11.4 °C, 2020 2.7 °C, 2018
Mean Dew Point 7.5 °C 0.9 °C 7.7 °C, 2019 -1.2 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.8 °C * 05:29 1.8 °C 10.3 °C, 2020 -2.1 °C, 2016
Day Maximum (09-21) 10.3 °C 16:27 5.2 °C 12.4 °C, 2019 4.4 °C, 2010
Max 10m Temp Rise 0.2 °C 05:41 0.4 °C 0.6 °C, 2009 0.2 °C, 2010
Max 1hr Temp Rise 0.4 °C 11:17 1.1 °C 2.4 °C, 2016 0.4 °C, 2021
Max 1hr Hum Rise 5% 09:22 6% 12%, 2018 2%, 2010
Max 10m Temp Fall 0.2 °C 03:52 0.3 °C 1.1 °C, 2009 0.2 °C, 2012
Max 1hr Temp Fall 0.8 °C 19:49 0.9 °C 2.4 °C, 2013 0.6 °C, 2017
Max 1hr Hum Fall 5% 02:06 7% 19%, 2014 2%, 2010
Max 10m Wind Speed 11.8 mph 00:10 10.8 mph 21.3 mph, 2020 5.2 mph, 2013
Minimum Feels-like 4.2 °C 23:00 -4.1 °C 4.2 °C, 2021 -4.0 °C, 2016
Maximum Feels-like 10.9 °C 16:19 4.5 °C 14.9 °C, 2020 4.4 °C, 2010
Mean Feels-like 7.1 °C 0.5 °C 9.5 °C, 2019 1.1 °C, 2016
Air-frost Hrs 0 hrs 8 hrs 4 hrs, 2016 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.5 °C (-3.1) 4.2 °C (-0.9) 9.1 °C (+3.5), 2016 2.5 °C (-3.1), 2021
Humidity Range 9% 16% 41%, 2018 4%, 2010
Pressure Range 9 hPa 7 hPa 15 hPa, 2020 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]20 hrs (48%) [15%] 8.5 [95%], 2016 0 [0%], 2010
Wet Hours 3
[Mean rain rate: 0.6 mm/h]
50 hrs (168%) [13%] 17, 2010 , 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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