Daily Report for 19th October 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.3 °C (+7.9) 00:05 9.5 °C (+0.4) 16.3 °C (+7.9), 2021 4.7 °C (-3.7), 2009
Maximum Temperature 19.7 °C (+5.2) 13:45 16.3 °C (+0.8) 19.7 °C (+5.2), 2021 11.7 °C (-2.8), 2011
Mean Temperature 17.6 °C (+6.6) 13.0 °C (+0.6) 17.6 °C, 2021 7.8 °C, 2011
Minimum Humidity 77% 13:47 73% 86%, 2017 45%, 2011
Maximum Humidity 96% 02:33 94% 98%, 2012 78%, 2016
Mean Humidity 89% 86% 94%, 2012 70%, 2011
Minimum Pressure 1008 hPa 23:50 1015 hPa 1026 hPa, 2018 981 hPa, 2023
Maximum Pressure 1015 hPa 00:50 1023 hPa 1030 hPa, 2018 988 hPa, 2023
Mean Pressure 1013 hPa 1019 hPa 1027 hPa, 2018 985 hPa, 2023
Mean Wind Speed 9.7 mph (+5.6) 3.6 mph (-0.5) 9.7 mph, 2021 0.6 mph, 2018
Maximum Wind Speed 21.9 mph 09:53 11.8 mph 21.9 mph, 2021 6.0 mph, 2018
Maximum Gust 31.9 mph 09:53 18.6 mph 31.9 mph, 2021 10.5 mph, 2009
Mean Wind Direction SW
Rainfall 2.2 mm 52.6 mm (132%) 7.0 mm, 2017
Maximum Hourly Rain 1.0 mm 20:36 3.1 mm, 2017
Maximum 10-min Rain 0.8 mm 20:30 2.0 mm, 2017
Maximum Rain Rate 4.8 mm/h 20:26 30 mm/h, 2024
Minimum Dew Point 15.0 °C 18:11 7.7 °C 15.0 °C, 2021 -0.2 °C, 2011
Maximum Dew Point 16.6 °C 08:55 13.1 °C 16.6 °C, 2021 5.0 °C, 2011
Mean Dew Point 15.7 °C 10.6 °C 15.7 °C, 2021 2.5 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 15.8 °C * 21:06 10.1 °C 15.8 °C, 2014 4.7 °C, 2009
Day Maximum (09-21) 19.7 °C 13:45 16.3 °C 19.7 °C, 2021 11.7 °C, 2011
Max 10m Temp Rise 0.3 °C 10:23 0.5 °C 0.6 °C, 2018 0.2 °C, 2012
Max 1hr Temp Rise 0.9 °C 10:59 1.7 °C 2.8 °C, 2018 0.7 °C, 2015
Max 1hr Hum Rise 5% 17:24 7% 13%, 2010 3%, 2015
Max 10m Temp Fall 0.3 °C 14:07 0.5 °C 0.9 °C, 2010 0.2 °C, 2012
Max 1hr Temp Fall 0.8 °C 17:26 1.6 °C 2.9 °C, 2024 0.6 °C, 2025
Max 1hr Hum Fall 9% 10:05 8% 13%, 2020 2%, 2012
Max 10m Wind Speed 15.2 mph 09:53 8.8 mph 15.2 mph, 2021 3.2 mph, 2018
Minimum Feels-like 20.6 °C 00:00 9.3 °C 20.6 °C, 2021 0.0 °C, 2009
Maximum Feels-like 24.2 °C 13:33 19.0 °C 24.2 °C, 2021 0.0 °C, 2009
Mean Feels-like 22.0 °C 14.6 °C 22.0 °C, 2021 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.4 °C (-2.7) 6.8 °C (+0.4) 9.0 °C (+2.9), 2018 2.0 °C (-4.1), 2012
Humidity Range 19% 21% 40%, 2011 10%, 2023
Pressure Range 8 hPa 7 hPa 22 hPa, 2025 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [3%]60 hrs (80%) [32%] 9 [96%], 2018 0 [0%], 2009
Wet Hours 3
[Mean rain rate: 0.7 mm/h]		31 hrs (102%) [6.7%] 8, 2012 0, 2009
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments late rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 13.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 19th October 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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