Daily Report for 19th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (-2.0) 23:23 7.4 °C (+1.6) 12.1 °C (+7.2), 2009 -1.6 °C (-6.4), 2019
Maximum Temperature 9.8 °C (-0.5) 10:34 13.2 °C (+2.3) 14.0 °C (+3.7), 2009 5.8 °C (-4.5), 2013
Mean Temperature 7.4 °C (-1.3) 10.5 °C (+1.9) 13.0 °C, 2009 2.5 °C, 2019
Minimum Humidity 75% 06:04 76% 88%, 2014 60%, 2013
Maximum Humidity 90% 12:16 94% 98%, 2010 83%, 2009
Mean Humidity 82% 86% 94%, 2014 76%, 2009
Minimum Pressure 1017 hPa 03:45 1013 hPa 1030 hPa, 2021 989 hPa, 2016
Maximum Pressure 1037 hPa 22:19 1023 hPa 1037 hPa, 2020 1002 hPa, 2016
Mean Pressure 1027 hPa 1018 hPa 1031 hPa, 2021 997 hPa, 2016
Mean Wind Speed 5.6 mph (+1.0) 5.0 mph (+0.4) 9.9 mph, 2009 0.4 mph, 2019
Maximum Wind Speed 15.9 mph 02:44 12.5 mph 20.1 mph, 2015 4.6 mph, 2019
Maximum Gust 28.5 mph 03:28 21.0 mph 31.1 mph, 2018 8.7 mph, 2010
Mean Wind Direction WNW
Rainfall 1.3 mm 31.0 mm (73%) 3.9 mm, 2015
Maximum Hourly Rain 0.7 mm 13:08 2.1 mm, 2015
Maximum 10-min Rain 0.3 mm 12:13 0.8 mm, 2015
Maximum Rain Rate 0.9 mm/h 11:00 24 mm/h, 2015
Minimum Dew Point 0.8 °C 23:14 5.5 °C 8.6 °C, 2023 -3.5 °C, 2013
Maximum Dew Point 7.1 °C 10:45 10.9 °C 11.0 °C, 2023 3.8 °C, 2016
Mean Dew Point 4.6 °C 8.3 °C 9.6 °C, 2023 -0.4 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.9 °C * 01:11 8.7 °C 12.6 °C, 2009 -1.6 °C, 2019
Day Maximum (09-21) 9.8 °C 10:34 13.1 °C 14.0 °C, 2009 4.7 °C, 2013
Max 10m Temp Rise 0.4 °C 23:38 0.4 °C 0.5 °C, 2018 0.1 °C, 2015
Max 1hr Temp Rise 0.7 °C 02:21 1.4 °C 1.9 °C, 2016 0.5 °C, 2015
Max 1hr Hum Rise 8% 11:38 6% 8%, 2018 2%, 2014
Max 10m Temp Fall 0.6 °C 10:56 0.5 °C 0.7 °C, 2015 0.2 °C, 2014
Max 1hr Temp Fall 1.4 °C 11:22 1.4 °C 1.8 °C, 2015 0.4 °C, 2021
Max 1hr Hum Fall 7% 05:11 7% 14%, 2012 2%, 2015
Max 10m Wind Speed 13.1 mph 03:07 7.8 mph 15.1 mph, 2015 2.9 mph, 2019
Minimum Feels-like 1.1 °C 21:39 6.3 °C 12.3 °C, 2009 -7.0 °C, 2019
Maximum Feels-like 9.2 °C 09:43 14.9 °C 15.6 °C, 2023 5.8 °C, 2013
Mean Feels-like 5.3 °C 11.2 °C 13.8 °C, 2009 0.8 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 8 hrs, 2019 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.0 °C (+1.6) 5.8 °C (+0.7) 8.4 °C (+3.0), 2019 1.6 °C (-3.8), 2021
Humidity Range 15% 18% 34%, 2013 8%, 2021
Pressure Range 20 hPa 10 hPa 20 hPa, 2020 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [26%]52 hrs (96%) [34%] 6 [78%], 2010 0 [0%], 2015
Wet Hours 3
[Mean rain rate: 0.4 mm/h]
40 hrs (99%) [8.7%] 5, 2015 0, 2009
Cloud Cover am: Overcast
pm: Mostly Sunny
Events None
Comments lunch rn
Extra Comments
Issues wind from harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 10.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th November 2020.
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 derived based on analysis of webcam observations, but may use data from our closest site, Heathrow, when needed.
Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually.
Rainfall totals may be manually adjusted after the fact to correct delayed or erroneous data.
Cloud cover and Events are manually reported, often with multi-week delays.
Data is generally reliable and accurate but should always be viewed with some quantity of salt to hand.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose