Daily Report for 29th January 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+5.4) 23:32 1.7 °C (-0.6) 9.6 °C (+7.2), 2013 -0.8 °C (-3.2), 2019
Maximum Temperature 10.6 °C (+3.6) 00:04 6.4 °C (-0.6) 13.5 °C (+6.5), 2013 1.3 °C (-5.7), 2011
Mean Temperature 9.2 °C (+4.5) 4.2 °C (-0.6) 11.6 °C, 2013 0.7 °C, 2011
Minimum Humidity 80% 14:50 83% 91%, 2014 64%, 2015
Maximum Humidity 94% 00:31 94% 98%, 2010 77%, 2011
Mean Humidity 88% 90% 95%, 2014 74%, 2011
Minimum Pressure 996 hPa 01:12 1008 hPa 1028 hPa, 2012 976 hPa, 2015
Maximum Pressure 1004 hPa 19:43 1017 hPa 1032 hPa, 2012 999 hPa, 2014
Mean Pressure 999 hPa 1013 hPa 1030 hPa, 2012 985 hPa, 2015
Mean Wind Speed 5.9 mph (+0.7) 4.5 mph (-0.7) 12.0 mph, 2016 2.9 mph, 2012
Maximum Wind Speed 15.1 mph 02:55 12.4 mph 23.2 mph, 2016 8.5 mph, 2012
Maximum Gust 25.1 mph 03:28 19.8 mph 33.1 mph, 2013 10.5 mph, 2012
Mean Wind Direction WNW
Rainfall 4.8 mm 85.4 mm (166%) 14.0 mm, 2017
Maximum Hourly Rain 3.1 mm 10:48 4.3 mm, 2017
Maximum 10-min Rain 1.0 mm 00:10 1.1 mm, 2017
Maximum Rain Rate 4.8 mm/h 00:07 11 mm/h, 2017
Minimum Dew Point 6.2 °C 22:11 0.3 °C 6.9 °C, 2013 -4.6 °C, 2010
Maximum Dew Point 9.7 °C 00:04 4.7 °C 12.3 °C, 2013 -2.8 °C, 2011
Mean Dew Point 7.4 °C 2.6 °C 10.2 °C, 2013 -3.3 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.5 °C * 08:18 2.3 °C 10.4 °C, 2018 -0.8 °C, 2019
Day Maximum (09-21) 10.6 °C 15:07 6.1 °C 13.5 °C, 2013 1.3 °C, 2011
Max 10m Temp Rise 0.3 °C 13:02 0.3 °C 0.5 °C, 2017 0.1 °C, 2011
Max 1hr Temp Rise 1.2 °C 12:38 1.1 °C 1.9 °C, 2017 0.3 °C, 2014
Max 1hr Hum Rise 5% 18:59 4% 12%, 2015 2%, 2011
Max 10m Temp Fall 0.2 °C 02:53 0.4 °C 0.9 °C, 2015 0.1 °C, 2011
Max 1hr Temp Fall 0.9 °C 10:44 1.1 °C 2.9 °C, 2019 0.3 °C, 2011
Max 1hr Hum Fall 5% 13:09 5% 11%, 2010 1%, 2011
Max 10m Wind Speed 11.0 mph 13:06 9.7 mph 17.3 mph, 2016 6.4 mph, 2012
Minimum Feels-like 4.3 °C 11:48 -2.3 °C 6.3 °C, 2013 -6.0 °C, 2010
Maximum Feels-like 11.7 °C 00:00 6.1 °C 15.7 °C, 2013 1.2 °C, 2011
Mean Feels-like 7.8 °C 2.2 °C 12.6 °C, 2013 -2.8 °C, 2011
Air-frost Hrs 0 hrs 3 hrs 4 hrs, 2019 0 hrs, 2012
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.8 °C (-1.8) 4.7 °C (+0.0) 9.2 °C (+4.6), 2018 1.4 °C (-3.2), 2011
Humidity Range 14% 11% 31%, 2010 4%, 2011
Pressure Range 8 hPa 8 hPa 23 hPa, 2015 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]40 hrs (71%) [18%] 8 [100%], 2020 0 [0%], 2011
Wet Hours 3
[Mean rain rate: 1.6 mm/h]
84 hrs (134%) [12%] 17, 2014 , 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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