Daily Report for 6th August 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.2 °C (-0.2) 23:51 12.9 °C (-1.5) 18.6 °C (+4.2), 2020 10.1 °C (-4.3), 2025
Maximum Temperature 22.3 °C (-0.9) 15:03 21.4 °C (-1.8) 31.6 °C (+8.4), 2018 19.9 °C (-3.3), 2011
Mean Temperature 17.3 °C (-0.6) 17.0 °C (-1.7) 24.2 °C, 2018 15.2 °C, 2023
Minimum Humidity 58% 15:03 59% 65%, 2024 28%, 2018
Maximum Humidity 90% 06:00 93% 97%, 2009 79%, 2011
Mean Humidity 82% 79% 84%, 2009 55%, 2022
Minimum Pressure 997 hPa 05:13 1008 hPa 1028 hPa, 2022 997 hPa, 2021
Maximum Pressure 1002 hPa 22:23 1013 hPa 1031 hPa, 2022 1002 hPa, 2021
Mean Pressure 1000 hPa 1010 hPa 1029 hPa, 2022 1000 hPa, 2021
Mean Wind Speed 7.8 mph (+3.8) 3.1 mph (-0.9) 7.8 mph, 2021 1.7 mph, 2022
Maximum Wind Speed 17.8 mph 14:35 10.6 mph 17.8 mph, 2021 6.7 mph, 2013
Maximum Gust 28.5 mph 13:07 16.5 mph 28.5 mph, 2021 9.8 mph, 2013
Mean Wind Direction WSW
Rainfall 6.0 mm 8.4 mm (80%) 34.3 mm, 2009
Maximum Hourly Rain 3.4 mm 18:08 9.9 mm, 2009
Maximum 10-min Rain 2.6 mm 18:03 4.7 mm, 2009
Maximum Rain Rate 42 mm/h 18:01 66 mm/h, 2009
Minimum Dew Point 11.9 °C 23:19 11.0 °C 14.2 °C, 2009 6.5 °C, 2022
Maximum Dew Point 16.2 °C 16:30 14.9 °C 19.4 °C, 2009 11.2 °C, 2017
Mean Dew Point 14.1 °C 13.0 °C 16.9 °C, 2020 8.5 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 15.7 °C * 04:17 13.4 °C 18.9 °C, 2020 10.1 °C, 2025
Day Maximum (09-21) 22.3 °C 15:03 21.4 °C 31.6 °C, 2018 19.9 °C, 2011
Max 10m Temp Rise 0.6 °C 10:18 0.7 °C 1.0 °C, 2010 0.4 °C, 2011
Max 1hr Temp Rise 1.9 °C 10:32 2.3 °C 4.7 °C, 2018 1.7 °C, 2019
Max 1hr Hum Rise 19% 16:29 12% 19%, 2021 6%, 2017
Max 10m Temp Fall 1.0 °C 16:37 0.6 °C 1.0 °C, 2021 0.3 °C, 2010
Max 1hr Temp Fall 2.4 °C 17:16 1.8 °C 3.6 °C, 2020 1.3 °C, 2017
Max 1hr Hum Fall 10% 13:27 11% 21%, 2018 8%, 2009
Max 10m Wind Speed 14.9 mph 13:07 8.1 mph 14.9 mph, 2021 4.6 mph, 2022
Minimum Feels-like 16.4 °C 23:41 14.7 °C 22.3 °C, 2020 10.1 °C, 2025
Maximum Feels-like 25.6 °C 15:02 24.7 °C 34.4 °C, 2018 21.6 °C, 2011
Mean Feels-like 20.7 °C 19.8 °C 27.6 °C, 2020 17.1 °C, 2023
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.1 °C (-0.7) 8.5 °C (-0.2) 16.8 °C (+8.0), 2018 5.1 °C (-3.7), 2011
Humidity Range 32% 34% 64%, 2018 27%, 2011
Pressure Range 5 hPa 5 hPa 9 hPa, 2011 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [7%]20 hrs (53%) [24%] 14 [101%], 2022 1 [7%], 2011
Wet Hours 3
[Mean rain rate: 2.0 mm/h]		7 hrs (95%) [4.9%] 7.5, 2009 0, 2013
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments pm shs
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 19.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 6th August 2021.
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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