Daily Report for 26th January 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -0.3 °C (-2.6) 04:42 1.1 °C (-1.3) 6.8 °C (+4.5), 2019 -1.8 °C (-4.1), 2010
Maximum Temperature 6.5 °C (-0.5) 23:56 5.9 °C (-1.1) 11.8 °C (+4.8), 2016 0.4 °C (-6.6), 2017
Mean Temperature 3.0 °C (-1.5) 3.6 °C (-1.2) 9.6 °C, 2016 -0.4 °C, 2017
Minimum Humidity 84% 11:41 82% 84%, 2021 58%, 2015
Maximum Humidity 95% 23:25 94% 97%, 2011 82%, 2017
Mean Humidity 90% 89% 92%, 2011 76%, 2017
Minimum Pressure 1011 hPa 23:33 1009 hPa 1038 hPa, 2010 986 hPa, 2019
Maximum Pressure 1019 hPa 07:59 1018 hPa 1042 hPa, 2010 1007 hPa, 2009
Mean Pressure 1016 hPa 1014 hPa 1040 hPa, 2010 998 hPa, 2009
Mean Wind Speed 4.0 mph (-1.2) 4.5 mph (-0.7) 10.8 mph, 2016 2.2 mph, 2018
Maximum Wind Speed 13.0 mph 17:45 12.4 mph 23.2 mph, 2016 7.6 mph, 2018
Maximum Gust 19.4 mph 15:31 19.7 mph 38.4 mph, 2016 12.7 mph, 2018
Mean Wind Direction SW
Rainfall 2.2 mm 55.9 mm (121%) 5.7 mm, 2019
Maximum Hourly Rain 1.2 mm 18:17 5.3 mm, 2019
Maximum 10-min Rain 0.5 mm 18:17 2.9 mm, 2019
Maximum Rain Rate 1.6 mm/h 18:17 53 mm/h, 2019
Minimum Dew Point -2.0 °C 01:32 -0.4 °C 5.4 °C, 2019 -5.2 °C, 2017
Maximum Dew Point 5.8 °C 23:56 4.2 °C 10.2 °C, 2016 -2.5 °C, 2017
Mean Dew Point 1.5 °C 2.0 °C 7.3 °C, 2016 -4.2 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -0.3 °C 04:44 1.7 °C 7.7 °C, 2015 -0.3 °C, 2021
Day Maximum (09-21) * 5.7 °C * 15:22 5.6 °C 11.5 °C, 2016 0.4 °C, 2017
Max 10m Temp Rise 0.4 °C 11:16 0.3 °C 0.5 °C, 2018 0.1 °C, 2011
Max 1hr Temp Rise 1.6 °C 11:27 1.1 °C 1.7 °C, 2018 0.4 °C, 2017
Max 1hr Hum Rise 5% 15:54 4% 13%, 2012 2%, 2017
Max 10m Temp Fall 0.2 °C 15:52 0.4 °C 0.8 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 0.6 °C 16:31 1.1 °C 2.6 °C, 2012 0.6 °C, 2015
Max 1hr Hum Fall 5% 11:23 5% 19%, 2014 2%, 2017
Max 10m Wind Speed 10.3 mph 17:40 9.7 mph 18.1 mph, 2016 5.3 mph, 2018
Minimum Feels-like -3.3 °C 00:24 -3.1 °C 3.6 °C, 2016 -6.4 °C, 2017
Maximum Feels-like 6.4 °C 23:52 5.5 °C 13.2 °C, 2016 0.0 °C, 2017
Mean Feels-like 0.9 °C 1.4 °C 9.0 °C, 2016 -3.8 °C, 2017
Air-frost Hrs 4 hrs 3 hrs 12 hrs, 2017 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.8 °C (+2.1) 4.8 °C (+0.2) 6.8 °C (+2.1), 2021 2.1 °C (-2.6), 2017
Humidity Range 11% 11% 35%, 2015 11%, 2021
Pressure Range 8 hPa 8 hPa 28 hPa, 2019 4 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]39 hrs (78%) [20%] 4.5 [57%], 2013 0 [0%], 2011
Wet Hours 4
[Mean rain rate: 0.6 mm/h]
66 hrs (117%) [11%] 6, 2013 , 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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