Daily Report for 13th November 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.1 °C (+4.5) 19:59 7.2 °C (+1.0) 10.3 °C (+4.7), 2009 2.3 °C (-3.3), 2017
Maximum Temperature 12.6 °C (+2.0) 09:27 13.2 °C (+2.0) 15.4 °C (+4.8), 2009 7.1 °C (-3.5), 2017
Mean Temperature 10.9 °C (+3.3) 10.3 °C (+1.5) 12.4 °C, 2012 4.6 °C, 2017
Minimum Humidity 74% 15:08 76% 91%, 2022 63%, 2015
Maximum Humidity 90% 05:42 94% 99%, 2023 80%, 2016
Mean Humidity 84% 87% 96%, 2022 72%, 2015
Minimum Pressure 1010 hPa 05:55 1015 hPa 1034 hPa, 2024 990 hPa, 2019
Maximum Pressure 1016 hPa 21:46 1025 hPa 1037 hPa, 2024 995 hPa, 2010
Mean Pressure 1013 hPa 1020 hPa 1036 hPa, 2024 993 hPa, 2010
Mean Wind Speed 4.9 mph (+0.3) 3.5 mph (-1.1) 8.8 mph, 2015 2.3 mph, 2024
Maximum Wind Speed 12.8 mph 08:36 9.6 mph 23.3 mph, 2023 6.9 mph, 2022
Maximum Gust 22.8 mph 08:35 17.5 mph 35.7 mph, 2023 10.4 mph, 2022
Mean Wind Direction SW
Rainfall 0.5 mm 12.1 mm (42%) 12.2 mm, 2023
Maximum Hourly Rain 0.4 mm 09:40 7.4 mm, 2023
Maximum 10-min Rain 0.2 mm 1.6 mm, 2023
Maximum Rain Rate 1.2 mm/h 09:40 54 mm/h, 2015
Minimum Dew Point 6.8 °C 19:46 5.5 °C 9.7 °C, 2009 -0.9 °C, 2017
Maximum Dew Point 10.3 °C 09:30 10.7 °C 13.7 °C, 2023 2.7 °C, 2017
Mean Dew Point 8.2 °C 8.2 °C 10.8 °C, 2009 1.0 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.2 °C * 03:32 8.0 °C 10.6 °C, 2011 2.3 °C, 2017
Day Maximum (09-21) 12.6 °C 09:27 13.2 °C 15.4 °C, 2009 7.1 °C, 2017
Max 10m Temp Rise 0.3 °C 06:18 0.5 °C 0.9 °C, 2023 0.2 °C, 2010
Max 1hr Temp Rise 1.1 °C 06:39 1.5 °C 2.8 °C, 2023 0.7 °C, 2010
Max 1hr Hum Rise 4% 10:10 5% 9%, 2015 2%, 2016
Max 10m Temp Fall 0.6 °C 09:56 0.5 °C 2.1 °C, 2015 0.2 °C, 2012
Max 1hr Temp Fall 1.8 °C 10:21 1.4 °C 2.0 °C, 2015 0.5 °C, 2014
Max 1hr Hum Fall 7% 11:58 7% 19%, 2023 2%, 2016
Max 10m Wind Speed 8.8 mph 00:28 4.7 mph 16.4 mph, 2023 5.3 mph, 2022
Minimum Feels-like 10.1 °C 19:14 6.5 °C 11.5 °C, 2009 -2.9 °C, 2017
Maximum Feels-like 14.0 °C 09:29 14.9 °C 17.8 °C, 2023 7.0 °C, 2017
Mean Feels-like 11.4 °C 11.1 °C 13.9 °C, 2012 2.0 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.5 °C (-2.5) 6.1 °C (+1.0) 6.8 °C (+1.8), 2013 2.1 °C (-2.9), 2021
Humidity Range 16% 18% 30%, 2023 6%, 2016
Pressure Range 6 hPa 10 hPa 13 hPa, 2018 4 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [44%]44 hrs (116%) [41%] 7.8 [98%], 2013 0 [0%], 2009
Wet Hours 0.5
[Mean rain rate: 1.0 mm/h]		15 hrs (55%) [4.8%] 8, 2009 0, 2010
Cloud Cover Mostly Sunny with periods of Mostly Cloudy
Events None
Comments 0930 sh
Extra Comments
Issues wind from harpenden
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 10.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th 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