Daily Report for 26th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (-1.0) 23:58 6.8 °C (+1.6) 10.3 °C (+6.5), 2019 -3.2 °C (-7.0), 2010
Maximum Temperature 8.8 °C (-0.5) 12:05 12.7 °C (+2.4) 13.2 °C (+3.9), 2019 2.6 °C (-6.7), 2010
Mean Temperature 6.1 °C (-0.8) 10.0 °C (+2.0) 11.4 °C, 2019 -0.8 °C, 2010
Minimum Humidity 78% 12:28 76% 96%, 2014 63%, 2009
Maximum Humidity 95% 23:24 94% 98%, 2014 80%, 2016
Mean Humidity 87% 87% 98%, 2014 76%, 2013
Minimum Pressure 1020 hPa 00:07 1015 hPa 1035 hPa, 2013 988 hPa, 2019
Maximum Pressure 1023 hPa 09:55 1024 hPa 1040 hPa, 2013 1001 hPa, 2009
Mean Pressure 1022 hPa 1020 hPa 1038 hPa, 2013 996 hPa, 2019
Mean Wind Speed 0.2 mph (-4.4) 4.8 mph (+0.2) 7.7 mph, 2011 0.2 mph, 2020
Maximum Wind Speed 2.1 mph 03:16 12.2 mph 20.8 mph, 2011 2.1 mph, 2020
Maximum Gust 5.7 mph 03:52 20.0 mph 30.6 mph, 2011 5.7 mph, 2020
Mean Wind Direction NW
Rainfall 0.0 mm 32.2 mm (62%) 5.5 mm, 2012
Maximum Hourly Rain n/a 1.8, 2014
Maximum 10-min Rain n/a 0.9, 2012
Maximum Rain Rate n/a 15, 2012
Minimum Dew Point 1.9 °C 23:08 4.9 °C 8.8 °C, 2019 -5.4 °C, 2010
Maximum Dew Point 5.7 °C 14:26 10.4 °C 11.8 °C, 2019 -1.5 °C, 2010
Mean Dew Point 4.0 °C 7.8 °C 10.0 °C, 2019 -3.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.8 °C * 00:10 8.1 °C 10.3 °C, 2019 -2.1 °C, 2010
Day Maximum (09-21) 8.8 °C 12:09 12.5 °C 13.2 °C, 2019 2.6 °C, 2010
Max 10m Temp Rise 0.7 °C 11:09 0.4 °C 0.7 °C, 2020 0.1 °C, 2014
Max 1hr Temp Rise 2.3 °C 11:40 1.4 °C 2.3 °C, 2020 0.3 °C, 2014
Max 1hr Hum Rise 5% 17:18 6% 7%, 2009 1%, 2014
Max 10m Temp Fall 0.4 °C 16:16 0.5 °C 0.5 °C, 2009 0.1 °C, 2014
Max 1hr Temp Fall 1.8 °C 17:04 1.4 °C 1.8 °C, 2010 0.2 °C, 2014
Max 1hr Hum Fall 8% 11:47 7% 12%, 2009 0%, 2014
Max 10m Wind Speed 0.8 mph 03:54 8.2 mph 15.8 mph, 2011 0.8 mph, 2020
Minimum Feels-like 2.8 °C 23:58 5.7 °C 11.1 °C, 2019 -6.3 °C, 2010
Maximum Feels-like 8.8 °C 11:54 14.1 °C 15.4 °C, 2019 2.5 °C, 2010
Mean Feels-like 6.1 °C 10.4 °C 12.7 °C, 2019 -2.5 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 17 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.0 °C (+0.5) 5.9 °C (+0.8) 6.2 °C (+0.7), 2011 1.6 °C (-3.9), 2014
Humidity Range 17% 17% 25%, 2009 2%, 2014
Pressure Range 3 hPa 9 hPa 13 hPa, 2019 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [13%]63 hrs (97%) [30%] 7.2 [97%], 2010 0 [0%], 2014
Wet Hours 044 hrs (80%) [7%] 10, 2014 0, 2010
Cloud Cover Mostly Cloudy
Events None
Comments -
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