Daily Report for 25th September 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.1 °C (-2.6) 07:13 12.5 °C (+0.8) 15.6 °C (+4.9), 2023 3.7 °C (-7.0), 2018
Maximum Temperature 16.3 °C (-1.3) 12:24 20.2 °C (+0.9) 21.4 °C (+3.8), 2023 13.4 °C (-4.2), 2010
Mean Temperature 12.6 °C (-1.9) 16.3 °C (+0.9) 18.3 °C, 2023 9.5 °C, 2010
Minimum Humidity 52% 15:10 62% 86%, 2021 43%, 2018
Maximum Humidity 92% 07:32 93% 97%, 2013 83%, 2010
Mean Humidity 73% 80% 90%, 2021 64%, 2016
Minimum Pressure 1012 hPa 23:39 1013 hPa 1034 hPa, 2018 988 hPa, 2012
Maximum Pressure 1022 hPa 10:09 1019 hPa 1039 hPa, 2018 989 hPa, 2012
Mean Pressure 1019 hPa 1016 hPa 1037 hPa, 2018 988 hPa, 2012
Mean Wind Speed 3.8 mph (-0.1) 3.3 mph (-0.6) 8.5 mph, 2016 0.8 mph, 2021
Maximum Wind Speed 10.0 mph 12:34 11.0 mph 23.0 mph, 2020 5.9 mph, 2021
Maximum Gust 16.1 mph 21:43 17.0 mph 34.6 mph, 2020 8.1 mph, 2013
Mean Wind Direction N
Rainfall 0.0 mm 36.0 mm (86%) 6.0 mm, 2024
Maximum Hourly Rain n/a 3.1, 2024
Maximum 10-min Rain n/a 2.1, 2024
Maximum Rain Rate n/a 30, 2024
Minimum Dew Point 5.6 °C 19:42 10.3 °C 13.1 °C, 2013 2.3 °C, 2010
Maximum Dew Point 9.8 °C 00:03 14.3 °C 16.2 °C, 2013 6.0 °C, 2010
Mean Dew Point 7.5 °C 12.5 °C 14.8 °C, 2021 3.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.1 °C 07:16 12.6 °C 16.3 °C, 2021 4.4 °C, 2018
Day Maximum (09-21) 16.3 °C 12:24 20.2 °C 21.4 °C, 2023 13.4 °C, 2010
Max 10m Temp Rise 0.5 °C 09:53 0.6 °C 0.9 °C, 2014 0.2 °C, 2017
Max 1hr Temp Rise 2.2 °C 08:47 2.0 °C 3.3 °C, 2018 0.4 °C, 2021
Max 1hr Hum Rise 7% 22:02 8% 13%, 2019 4%, 2021
Max 10m Temp Fall 0.4 °C 13:45 0.6 °C 0.7 °C, 2018 0.2 °C, 2014
Max 1hr Temp Fall 1.3 °C 19:07 1.6 °C 2.7 °C, 2015 0.9 °C, 2014
Max 1hr Hum Fall 17% 11:32 11% 17%, 2015 2%, 2021
Max 10m Wind Speed 6.7 mph 22:20 7.9 mph 16.6 mph, 2016 3.9 mph, 2021
Minimum Feels-like 5.5 °C 07:44 14.0 °C 18.6 °C, 2023 0.9 °C, 2009
Maximum Feels-like 16.5 °C 12:24 23.6 °C 24.9 °C, 2013 13.4 °C, 2010
Mean Feels-like 12.5 °C 19.0 °C 21.7 °C, 2023 8.6 °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 8.2 °C (+1.3) 7.7 °C (+0.1) 14.4 °C (+7.5), 2018 3.4 °C (-3.5), 2017
Humidity Range 40% 31% 49%, 2018 8%, 2021
Pressure Range 10 hPa 5 hPa 16 hPa, 2024 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [55%]105 hrs (84%) [36%] 10.8 [99%], 2018 0 [0%], 2017
Wet Hours 027 hrs (79%) [4.5%] 5, 2024 0, 2009
Cloud Cover unknown
Events None
Comments data is awaiting quality control from site operator
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 15.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 25th September 2022.
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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