Daily Report for 5th September 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.1 °C (+0.6) 06:21 13.6 °C (+0.9) 16.1 °C (+3.6), 2022 7.7 °C (-4.8), 2015
Maximum Temperature 24.6 °C (+3.7) 15:49 20.3 °C (-0.7) 28.7 °C (+7.8), 2023 14.8 °C (-6.1), 2015
Mean Temperature 18.2 °C (+2.1) 16.6 °C (+0.1) 21.5 °C, 2023 11.9 °C, 2015
Minimum Humidity 63% 17:38 69% 85%, 2024 40%, 2013
Maximum Humidity 94% 07:18 89% 97%, 2013 77%, 2012
Mean Humidity 81% 81% 92%, 2024 58%, 2012
Minimum Pressure 1020 hPa 05:17 1023 hPa 1024 hPa, 2012 1008 hPa, 2011
Maximum Pressure 1024 hPa 23:54 1027 hPa 1030 hPa, 2012 1015 hPa, 2011
Mean Pressure 1022 hPa 1025 hPa 1027 hPa, 2012 1011 hPa, 2013
Mean Wind Speed 1.4 mph (-2.5) 3.0 mph (-0.9) 8.0 mph, 2011 1.4 mph, 2021
Maximum Wind Speed 7.1 mph 12:00 9.3 mph 20.7 mph, 2011 6.7 mph, 2014
Maximum Gust 10.3 mph 12:00 14.6 mph 29.9 mph, 2011 8.7 mph, 2014
Mean Wind Direction ESE
Rainfall 0.0 mm 0.0 mm (0%) 7.2 mm, 2022
Maximum Hourly Rain n/a 5, 2022
Maximum 10-min Rain n/a 3.1, 2024
Maximum Rain Rate n/a 48, 2024
Minimum Dew Point 11.8 °C 04:26 11.3 °C 14.1 °C, 2022 4.1 °C, 2019
Maximum Dew Point 18.4 °C 14:32 15.4 °C 19.8 °C, 2016 8.7 °C, 2012
Mean Dew Point 14.7 °C 13.2 °C 16.4 °C, 2016 7.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.1 °C 06:21 13.6 °C 16.1 °C, 2022 9.3 °C, 2015
Day Maximum (09-21) 24.6 °C 15:49 20.3 °C 28.7 °C, 2023 14.8 °C, 2015
Max 10m Temp Rise 0.6 °C 11:39 0.5 °C 1.3 °C, 2009 0.4 °C, 2014
Max 1hr Temp Rise 2.5 °C 11:39 1.9 °C 3.7 °C, 2013 1.0 °C, 2015
Max 1hr Hum Rise 7% 20:30 5% 15%, 2011 6%, 2012
Max 10m Temp Fall 0.4 °C 19:30 0.4 °C 1.2 °C, 2009 0.3 °C, 2010
Max 1hr Temp Fall 1.6 °C 19:50 1.2 °C 2.3 °C, 2013 0.8 °C, 2010
Max 1hr Hum Fall 7% 10:49 6% 17%, 2013 5%, 2016
Max 10m Wind Speed 4.3 mph 12:41 6.6 mph 13.3 mph, 2011 4.3 mph, 2021
Minimum Feels-like 15.4 °C 04:22 15.6 °C 19.9 °C, 2022 7.7 °C, 2015
Maximum Feels-like 30.5 °C 14:32 24.4 °C 35.2 °C, 2023 16.3 °C, 2015
Mean Feels-like 22.0 °C 19.6 °C 26.3 °C, 2023 12.6 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.5 °C (+3.1) 6.7 °C (-1.6) 13.4 °C (+5.0), 2023 6.0 °C (-2.4), 2010
Humidity Range 31% 20% 57%, 2013 12%, 2024
Pressure Range 4 hPa 4 hPa 11 hPa, 2015 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8.4 [69%]13 hrs (49%) [21%] 12 [99%], 2012 0 [0%], 2016
Wet Hours 00 hrs (0%) [0%] 7, 2016 0, 2009
Cloud Cover am: Overcast transitioned to Sunny
pm: Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 18.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 5th September 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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