Daily Report for 30th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.8 °C (+1.1) 11:37 6.5 °C (+1.5) 8.6 °C (+4.9), 2015 -2.9 °C (-6.6), 2016
Maximum Temperature 10.0 °C (+1.0) 20:04 12.2 °C (+2.1) 13.1 °C (+4.1), 2015 1.0 °C (-8.0), 2010
Mean Temperature 7.0 °C (+1.1) 9.5 °C (+1.8) 11.3 °C, 2015 0.3 °C, 2010
Minimum Humidity 72% 20:53 77% 87%, 2010 62%, 2016
Maximum Humidity 96% 09:42 94% 98%, 2009 80%, 2016
Mean Humidity 91% 87% 94%, 2010 71%, 2016
Minimum Pressure 1020 hPa 19:33 1016 hPa 1032 hPa, 2016 985 hPa, 2009
Maximum Pressure 1028 hPa 00:00 1025 hPa 1035 hPa, 2016 1010 hPa, 2009
Mean Pressure 1024 hPa 1020 hPa 1034 hPa, 2016 998 hPa, 2009
Mean Wind Speed 5.1 mph (+0.5) 4.4 mph (-0.2) 8.7 mph, 2015 1.0 mph, 2016
Maximum Wind Speed 16.4 mph 19:53 11.8 mph 21.0 mph, 2015 6.4 mph, 2012
Maximum Gust 25.1 mph 20:25 19.2 mph 37.3 mph, 2015 8.4 mph, 2016
Mean Wind Direction NW
Rainfall 0.0 mm 32.4 mm (54%) 15.3 mm, 2009
Maximum Hourly Rain n/a 4.1, 2009
Maximum 10-min Rain n/a 1, 2015
Maximum Rain Rate n/a 36, 2015
Minimum Dew Point 2.7 °C 23:51 4.7 °C 4.6 °C, 2018 -6.4 °C, 2016
Maximum Dew Point 8.0 °C 19:13 10.0 °C 11.5 °C, 2015 -0.7 °C, 2016
Mean Dew Point 5.5 °C 7.5 °C 8.4 °C, 2015 -3.8 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.1 °C * 08:37 7.6 °C 8.6 °C, 2015 -2.9 °C, 2016
Day Maximum (09-21) 10.0 °C 20:16 11.9 °C 13.0 °C, 2015 1.0 °C, 2010
Max 10m Temp Rise 0.3 °C 12:24 0.4 °C 0.8 °C, 2016 0.1 °C, 2010
Max 1hr Temp Rise 1.3 °C 15:46 1.4 °C 2.8 °C, 2016 0.4 °C, 2010
Max 1hr Hum Rise 5% 21:52 5% 9%, 2011 2%, 2010
Max 10m Temp Fall 0.4 °C 21:03 0.4 °C 0.6 °C, 2015 0.1 °C, 2010
Max 1hr Temp Fall 1.5 °C 21:35 1.3 °C 2.8 °C, 2015 0.4 °C, 2010
Max 1hr Hum Fall 15% 20:52 7% 15%, 2020 4%, 2010
Max 10m Wind Speed 13.7 mph 19:49 8.0 mph 15.7 mph, 2015 4.8 mph, 2012
Minimum Feels-like 0.1 °C 11:31 5.1 °C 5.8 °C, 2015 -7.4 °C, 2010
Maximum Feels-like 10.4 °C 20:04 13.4 °C 15.1 °C, 2015 0.8 °C, 2010
Mean Feels-like 4.8 °C 9.7 °C 11.6 °C, 2015 -3.9 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 13 hrs, 2012 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.2 °C (-0.1) 5.7 °C (+0.6) 8.7 °C (+3.4), 2016 1.8 °C (-3.5), 2010
Humidity Range 24% 17% 24%, 2020 11%, 2010
Pressure Range 8 hPa 9 hPa 25 hPa, 2009 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]65 hrs (88%) [27%] 7.2 [98%], 2016 0 [0%], 2010
Wet Hours 045 hrs (71%) [6.2%] 10, 2009 0, 2012
Cloud Cover Overcast
Events Dense Fog
Comments dense fog til 12
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