Daily Report for 29th August 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.1 °C (-2.0) 00:59 15.9 °C (+2.0) 16.7 °C (+3.6), 2017 9.1 °C (-4.0), 2009
Maximum Temperature 14.7 °C (-6.8) 14:58 24.7 °C (+2.3) 25.3 °C (+3.8), 2017 14.7 °C (-6.8), 2020
Mean Temperature 12.6 °C (-4.4) 20.0 °C (+2.1) 20.6 °C, 2017 12.6 °C, 2020
Minimum Humidity 73% 15:06 56% 73%, 2020 41%, 2009
Maximum Humidity 92% 00:38 89% 95%, 2018 80%, 2017
Mean Humidity 84% 74% 84%, 2020 63%, 2013
Minimum Pressure 1003 hPa 00:02 1010 hPa 1025 hPa, 2021 995 hPa, 2025
Maximum Pressure 1014 hPa 23:55 1016 hPa 1027 hPa, 2021 1003 hPa, 2025
Mean Pressure 1009 hPa 1013 hPa 1026 hPa, 2021 998 hPa, 2025
Mean Wind Speed 5.6 mph (+1.6) 4.7 mph (+0.7) 7.2 mph, 2014 1.8 mph, 2018
Maximum Wind Speed 14.1 mph 00:52 13.7 mph 18.7 mph, 2012 7.0 mph, 2017
Maximum Gust 26.5 mph 00:53 22.0 mph 26.5 mph, 2020 12.5 mph, 2015
Mean Wind Direction N
Rainfall 0.2 mm 51.7 mm (102%) 19.2 mm, 2025
Maximum Hourly Rain 0.2 mm 7.0 mm, 2025
Maximum 10-min Rain 0.2 mm 2.0 mm, 2012
Maximum Rain Rate n/a 60, 2012
Minimum Dew Point 9.3 °C 23:57 12.7 °C 12.2 °C, 2017 3.0 °C, 2010
Maximum Dew Point 10.5 °C 14:45 17.0 °C 15.6 °C, 2016 10.0 °C, 2009
Mean Dew Point 10.0 °C 14.8 °C 13.5 °C, 2017 7.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.1 °C 01:00 16.2 °C 16.7 °C, 2017 9.1 °C, 2009
Day Maximum (09-21) 14.7 °C 14:59 24.7 °C 25.3 °C, 2017 14.7 °C, 2020
Max 10m Temp Rise 0.3 °C 10:03 0.6 °C 0.8 °C, 2013 0.3 °C, 2020
Max 1hr Temp Rise 1.2 °C 10:13 2.3 °C 3.0 °C, 2013 1.2 °C, 2020
Max 1hr Hum Rise 7% 19:20 9% 21%, 2010 5%, 2011
Max 10m Temp Fall 0.4 °C 18:54 0.6 °C 1.8 °C, 2012 0.3 °C, 2015
Max 1hr Temp Fall 1.2 °C 19:08 2.0 °C 4.2 °C, 2012 0.8 °C, 2014
Max 1hr Hum Fall 5% 10:24 10% 37%, 2010 5%, 2020
Max 10m Wind Speed 9.1 mph 01:00 9.8 mph 14.2 mph, 2012 5.2 mph, 2018
Minimum Feels-like 12.2 °C 01:12 19.1 °C 19.1 °C, 2017 7.6 °C, 2009
Maximum Feels-like 16.1 °C 14:53 29.3 °C 28.9 °C, 2017 16.1 °C, 2020
Mean Feels-like 13.8 °C 24.1 °C 23.7 °C, 2017 13.8 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.6 °C (-4.8) 8.7 °C (+0.3) 10.2 °C (+1.8), 2009 3.6 °C (-4.8), 2020
Humidity Range 19% 33% 52%, 2009 19%, 2020
Pressure Range 12 hPa 6 hPa 12 hPa, 2020 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [4%]157 hrs (90%) [41%] 10 [80%], 2013 0.3 [2%], 2018
Wet Hours 138 hrs (106%) [5.4%] 8, 2025 0, 2009
Cloud Cover Overcast
Events None
Comments o.night Rain, possible other Drizzle
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 29th 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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Wind rose