Daily Report for 28th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.3 °C (+2.5) 00:19 6.5 °C (+1.5) 9.5 °C (+5.7), 2014 -5.0 °C (-8.8), 2010
Maximum Temperature 10.4 °C (+1.2) 15:58 12.3 °C (+2.2) 13.2 °C (+4.0), 2018 0.6 °C (-8.6), 2010
Mean Temperature 8.5 °C (+1.9) 9.7 °C (+1.8) 11.9 °C, 2018 -2.1 °C, 2010
Minimum Humidity 89% 16:19 77% 89%, 2020 47%, 2016
Maximum Humidity 96% 12:17 94% 98%, 2009 72%, 2016
Mean Humidity 93% 87% 93%, 2020 61%, 2016
Minimum Pressure 1017 hPa 04:06 1015 hPa 1033 hPa, 2013 985 hPa, 2009
Maximum Pressure 1024 hPa 23:57 1024 hPa 1035 hPa, 2013 998 hPa, 2009
Mean Pressure 1020 hPa 1020 hPa 1034 hPa, 2013 992 hPa, 2009
Mean Wind Speed 2.0 mph (-2.6) 4.5 mph (-0.1) 8.2 mph, 2015 1.3 mph, 2013
Maximum Wind Speed 8.2 mph 06:41 11.9 mph 21.3 mph, 2018 6.7 mph, 2013
Maximum Gust 11.4 mph 06:16 19.4 mph 32.3 mph, 2018 8.7 mph, 2013
Mean Wind Direction ESE
Rainfall 0.0 mm 32.4 mm (58%) 13.9 mm, 2009
Maximum Hourly Rain n/a 3, 2009
Maximum 10-min Rain n/a 0.7, 2018
Maximum Rain Rate n/a 3.3, 2018
Minimum Dew Point 5.3 °C 00:16 4.8 °C 8.6 °C, 2014 -6.7 °C, 2010
Maximum Dew Point 9.0 °C 15:19 10.1 °C 11.9 °C, 2018 -2.2 °C, 2010
Mean Dew Point 7.4 °C 7.6 °C 10.8 °C, 2018 -4.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.1 °C * 21:19 7.7 °C 9.5 °C, 2014 -5.0 °C, 2010
Day Maximum (09-21) 10.4 °C 15:58 12.2 °C 13.2 °C, 2018 0.6 °C, 2010
Max 10m Temp Rise 0.2 °C 12:21 0.4 °C 0.5 °C, 2011 0.1 °C, 2012
Max 1hr Temp Rise 0.8 °C 14:21 1.4 °C 2.1 °C, 2011 0.3 °C, 2012
Max 1hr Hum Rise 2% 19:31 5% 8%, 2011 2%, 2013
Max 10m Temp Fall 0.2 °C 17:08 0.5 °C 0.5 °C, 2019 0.1 °C, 2013
Max 1hr Temp Fall 0.5 °C 17:08 1.3 °C 1.3 °C, 2019 0.4 °C, 2013
Max 1hr Hum Fall 3% 15:35 7% 17%, 2016 2%, 2013
Max 10m Wind Speed 6.5 mph 09:43 8.0 mph 15.3 mph, 2018 4.2 mph, 2013
Minimum Feels-like 4.7 °C 00:58 5.3 °C 7.4 °C, 2014 -6.0 °C, 2010
Maximum Feels-like 11.1 °C 15:42 13.7 °C 15.4 °C, 2018 0.6 °C, 2010
Mean Feels-like 7.8 °C 10.0 °C 13.4 °C, 2018 -3.4 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 18 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.1 °C (-1.3) 5.8 °C (+0.7) 12.3 °C (+6.9), 2011 1.8 °C (-3.6), 2013
Humidity Range 7% 17% 31%, 2009 7%, 2019
Pressure Range 8 hPa 9 hPa 18 hPa, 2019 2 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]65 hrs (93%) [29%] 7.4 [100%], 2016 0 [0%], 2013
Wet Hours 045 hrs (76%) [6.6%] 8, 2009 0, 2010
Cloud Cover Overcast
Events Dense Fog
Comments v dense fog til 13
Extra Comments
Issues wind from harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 10.5 °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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose