Daily Report for 21st August 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 18.2 °C (+4.4) 23:29 16.7 °C (+2.4) 19.0 °C (+5.2), 2010 7.7 °C (-6.1), 2014
Maximum Temperature 22.8 °C (+0.6) 13:39 26.4 °C (+3.7) 26.0 °C (+3.8), 2018 18.4 °C (-3.8), 2014
Mean Temperature 20.3 °C (+2.5) 21.4 °C (+3.1) 21.7 °C, 2018 13.5 °C, 2014
Minimum Humidity 60% 15:36 53% 79%, 2017 34%, 2013
Maximum Humidity 83% 02:44 89% 93%, 2023 83%, 2020
Mean Humidity 71% 73% 85%, 2010 57%, 2013
Minimum Pressure 1000 hPa 05:33 1012 hPa 1026 hPa, 2019 1000 hPa, 2020
Maximum Pressure 1010 hPa 23:43 1016 hPa 1029 hPa, 2019 1010 hPa, 2020
Mean Pressure 1004 hPa 1014 hPa 1027 hPa, 2019 1004 hPa, 2020
Mean Wind Speed 12.4 mph (+8.4) 4.1 mph (+0.1) 12.4 mph, 2020 0.8 mph, 2021
Maximum Wind Speed 28.6 mph 13:31 12.7 mph 28.6 mph, 2020 5.6 mph, 2021
Maximum Gust 43.8 mph 14:57 19.8 mph 43.8 mph, 2020 9.1 mph, 2021
Mean Wind Direction SSW
Rainfall 0.0 mm 37.3 mm (102%) 4.3 mm, 2017
Maximum Hourly Rain n/a 1.3, 2017
Maximum 10-min Rain n/a 0.3, 2009
Maximum Rain Rate n/a 3, 2017
Minimum Dew Point 13.7 °C 17:39 13.4 °C 16.8 °C, 2010 4.2 °C, 2014
Maximum Dew Point 16.8 °C 02:41 18.1 °C 18.3 °C, 2010 9.1 °C, 2014
Mean Dew Point 14.8 °C 15.7 °C 17.6 °C, 2010 6.3 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.3 °C * 22:46 16.9 °C 19.0 °C, 2010 7.7 °C, 2014
Day Maximum (09-21) 22.8 °C 13:39 26.4 °C 26.0 °C, 2018 18.4 °C, 2014
Max 10m Temp Rise 0.5 °C 11:46 0.7 °C 1.1 °C, 2009 0.2 °C, 2017
Max 1hr Temp Rise 1.4 °C 10:53 2.5 °C 3.8 °C, 2009 0.8 °C, 2017
Max 1hr Hum Rise 5% 01:03 9% 18%, 2016 3%, 2017
Max 10m Temp Fall 0.3 °C 11:14 0.6 °C 1.2 °C, 2009 0.1 °C, 2017
Max 1hr Temp Fall 1.1 °C 19:45 2.1 °C 2.7 °C, 2009 0.4 °C, 2017
Max 1hr Hum Fall 9% 12:28 10% 23%, 2009 2%, 2017
Max 10m Wind Speed 19.2 mph 12:38 9.0 mph 19.2 mph, 2020 3.7 mph, 2021
Minimum Feels-like 21.6 °C 23:42 20.3 °C 24.3 °C, 2010 6.0 °C, 2014
Maximum Feels-like 26.9 °C 13:36 31.6 °C 31.2 °C, 2018 18.4 °C, 2014
Mean Feels-like 24.1 °C 25.9 °C 26.5 °C, 2018 13.6 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.6 °C (-3.8) 9.8 °C (+1.3) 14.1 °C (+5.7), 2013 3.1 °C (-5.3), 2010
Humidity Range 23% 36% 50%, 2013 7%, 2017
Pressure Range 9 hPa 4 hPa 12 hPa, 2016 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [31%]130 hrs (102%) [46%] 11 [85%], 2013 0 [0%], 2017
Wet Hours 023 hrs (88%) [4.5%] 7, 2017 0, 2010
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy
Events None
Comments possible 09 Rain, could be deplayed tip
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 20.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 21st August 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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