Daily Report for 28th August 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.2 °C (-2.0) 23:41 16.1 °C (+2.1) 17.9 °C (+4.7), 2019 10.7 °C (-2.5), 2023
Maximum Temperature 18.3 °C (-3.2) 12:20 25.0 °C (+2.6) 28.2 °C (+6.6), 2024 18.3 °C (-3.2), 2020
Mean Temperature 14.7 °C (-2.6) 20.3 °C (+2.3) 22.0 °C, 2017 14.7 °C, 2020
Minimum Humidity 68% 12:44 55% 71%, 2016 39%, 2013
Maximum Humidity 94% 02:35 88% 94%, 2014 84%, 2009
Mean Humidity 85% 74% 85%, 2020 61%, 2017
Minimum Pressure 1000 hPa 12:46 1010 hPa 1026 hPa, 2021 1000 hPa, 2020
Maximum Pressure 1004 hPa 00:00 1016 hPa 1028 hPa, 2021 1004 hPa, 2020
Mean Pressure 1002 hPa 1013 hPa 1027 hPa, 2021 1002 hPa, 2020
Mean Wind Speed 2.4 mph (-1.6) 4.6 mph (+0.6) 7.6 mph, 2009 1.7 mph, 2013
Maximum Wind Speed 13.0 mph 21:30 13.7 mph 18.4 mph, 2009 5.9 mph, 2013
Maximum Gust 24.2 mph 21:40 21.8 mph 27.6 mph, 2009 7.6 mph, 2013
Mean Wind Direction NW
Rainfall 2.8 mm 51.5 mm (106%) 2.8 mm, 2020
Maximum Hourly Rain 2.0 mm 22:40 2.0 mm, 2020
Maximum 10-min Rain 0.9 mm 21:57 1.4 mm, 2009
Maximum Rain Rate 18 mm/h 22:07 24 mm/h, 2014
Minimum Dew Point 9.7 °C 21:23 12.9 °C 14.2 °C, 2016 6.5 °C, 2010
Maximum Dew Point 13.4 °C 10:08 17.2 °C 18.3 °C, 2024 11.0 °C, 2010
Mean Dew Point 12.1 °C 15.0 °C 15.4 °C, 2016 8.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.4 °C * 06:14 16.4 °C 18.8 °C, 2019 10.7 °C, 2023
Day Maximum (09-21) 18.3 °C 12:22 25.0 °C 28.2 °C, 2024 18.3 °C, 2020
Max 10m Temp Rise 0.7 °C 10:13 0.7 °C 0.9 °C, 2024 0.3 °C, 2018
Max 1hr Temp Rise 2.0 °C 11:03 2.4 °C 3.5 °C, 2024 1.3 °C, 2014
Max 1hr Hum Rise 9% 22:23 9% 14%, 2011 4%, 2016
Max 10m Temp Fall 0.8 °C 16:35 0.6 °C 0.9 °C, 2021 0.4 °C, 2014
Max 1hr Temp Fall 1.9 °C 17:15 2.0 °C 2.6 °C, 2013 1.1 °C, 2016
Max 1hr Hum Fall 11% 10:29 10% 17%, 2017 6%, 2016
Max 10m Wind Speed 10.2 mph 22:05 9.9 mph 13.8 mph, 2016 4.2 mph, 2013
Minimum Feels-like 12.4 °C 23:37 19.3 °C 21.5 °C, 2019 11.5 °C, 2010
Maximum Feels-like 21.1 °C 12:29 29.8 °C 34.4 °C, 2024 19.7 °C, 2010
Mean Feels-like 16.9 °C 24.4 °C 25.1 °C, 2017 15.8 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (-1.3) 8.9 °C (+0.5) 14.6 °C (+6.2), 2024 3.3 °C (-5.1), 2016
Humidity Range 26% 33% 54%, 2013 13%, 2016
Pressure Range 4 hPa 5 hPa 10 hPa, 2015 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [16%]156 hrs (93%) [42%] 11 [88%], 2017 1 [8%], 2016
Wet Hours 3
[Mean rain rate: 0.9 mm/h]		37 hrs (107%) [5.5%] 3, 2014 0, 2011
Cloud Cover Partly Cloudy or Mostly Cloudy
Events Thunder
Comments Showers, probable thunder
Extra Comments gorgeous clouds
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 28th 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

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose