Daily Report for 13th February 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (+3.5) 04:22 4.4 °C (+2.2) 5.6 °C (+3.7), 2011 -3.9 °C (-5.8), 2021
Maximum Temperature 9.3 °C (+2.1) 14:59 9.8 °C (+2.6) 11.3 °C (+4.1), 2019 1.5 °C (-5.7), 2021
Mean Temperature 7.2 °C (+2.8) 7.2 °C (+2.4) 8.2 °C, 2019 -1.1 °C, 2021
Minimum Humidity 77% 15:08 67% 83%, 2016 51%, 2014
Maximum Humidity 92% 05:44 91% 98%, 2009 75%, 2021
Mean Humidity 85% 80% 92%, 2012 64%, 2021
Minimum Pressure 991 hPa 12:16 1007 hPa 1032 hPa, 2019 983 hPa, 2016
Maximum Pressure 1013 hPa 23:57 1019 hPa 1035 hPa, 2021 993 hPa, 2016
Mean Pressure 1000 hPa 1013 hPa 1034 hPa, 2021 986 hPa, 2016
Mean Wind Speed 7.3 mph (+2.2) 7.9 mph (+2.8) 7.7 mph, 2014 4.1 mph, 2012
Maximum Wind Speed 20.9 mph 02:08 19.5 mph 20.9 mph, 2020 12.0 mph, 2016
Maximum Gust 32.3 mph 03:40 31.7 mph 33.4 mph, 2018 17.0 mph, 2016
Mean Wind Direction WSW
Rainfall 6.6 mm 31.9 mm (174%) 6.6 mm, 2020
Maximum Hourly Rain 2.9 mm 05:45 2.9 mm, 2020
Maximum 10-min Rain 0.9 mm 05:15 0.9 mm, 2020
Maximum Rain Rate 18 mm/h 03:33 18 mm/h, 2020
Minimum Dew Point 3.5 °C 23:11 1.3 °C 3.5 °C, 2020 -8.7 °C, 2021
Maximum Dew Point 6.3 °C 13:13 6.7 °C 7.1 °C, 2011 -5.1 °C, 2021
Mean Dew Point 4.8 °C 3.9 °C 5.5 °C, 2019 -7.2 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.4 °C 04:23 5.1 °C 6.8 °C, 2019 -3.9 °C, 2021
Day Maximum (09-21) 9.3 °C 14:59 9.6 °C 11.3 °C, 2019 1.1 °C, 2021
Max 10m Temp Rise 0.3 °C 09:33 0.4 °C 0.5 °C, 2012 0.1 °C, 2011
Max 1hr Temp Rise 1.3 °C 09:44 1.4 °C 1.6 °C, 2017 0.5 °C, 2011
Max 1hr Hum Rise 4% 12:49 7% 9%, 2012 3%, 2011
Max 10m Temp Fall 0.3 °C 03:21 0.5 °C 0.5 °C, 2018 0.1 °C, 2013
Max 1hr Temp Fall 1.0 °C 03:31 1.3 °C 1.4 °C, 2017 0.3 °C, 2013
Max 1hr Hum Fall 8% 13:45 9% 15%, 2012 3%, 2011
Max 10m Wind Speed 15.9 mph 03:42 14.3 mph 15.9 mph, 2020 7.8 mph, 2010
Minimum Feels-like -0.7 °C 04:21 -0.2 °C 2.6 °C, 2019 -12.5 °C, 2021
Maximum Feels-like 8.3 °C 13:53 9.5 °C 11.3 °C, 2019 -1.5 °C, 2021
Mean Feels-like 4.0 °C 4.9 °C 6.5 °C, 2019 -6.6 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 14 hrs, 2021 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-1.4) 5.4 °C (+0.5) 6.6 °C (+1.3), 2015 2.8 °C (-2.5), 2018
Humidity Range 15% 24% 35%, 2009 9%, 2016
Pressure Range 22 hPa 12 hPa 22 hPa, 2020 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [11%]53 hrs (159%) [48%] 7 [80%], 2017 0 [0%], 2011
Wet Hours 5
[Mean rain rate: 1.3 mm/h]
23 hrs (100%) [7.5%] 12, 2016 , 2009
Cloud Cover Mostly Cloudy
Events None
Comments o.night Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.0 °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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