Daily Report for 15th September 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (+0.1) 02:22 14.4 °C (+2.2) 17.0 °C (+5.4), 2016 6.7 °C (-4.9), 2013
Maximum Temperature 18.8 °C (-0.2) 15:30 21.8 °C (+1.6) 29.1 °C (+10.1), 2020 15.2 °C (-3.9), 2013
Mean Temperature 15.1 °C (-0.1) 18.0 °C (+1.9) 22.1 °C, 2016 11.2 °C, 2017
Minimum Humidity 61% 15:33 67% 83%, 2009 45%, 2012
Maximum Humidity 92% 02:36 94% 98%, 2009 84%, 2012
Mean Humidity 82% 83% 91%, 2009 64%, 2012
Minimum Pressure 1004 hPa 20:49 1010 hPa 1026 hPa, 2024 991 hPa, 2015
Maximum Pressure 1014 hPa 13:51 1016 hPa 1030 hPa, 2024 998 hPa, 2015
Mean Pressure 1010 hPa 1013 hPa 1028 hPa, 2024 995 hPa, 2015
Mean Wind Speed 3.1 mph (-0.8) 3.4 mph (-0.5) 12.2 mph, 2025 0.9 mph, 2020
Maximum Wind Speed 8.3 mph 15:09 11.8 mph 24.9 mph, 2025 6.9 mph, 2014
Maximum Gust 15.0 mph 14:35 17.8 mph 41.5 mph, 2025 10.0 mph, 2014
Mean Wind Direction NW
Rainfall 0.0 mm 35.0 mm (140%) 25.5 mm, 2009
Maximum Hourly Rain 0.0 mm 17:41 7.4 mm, 2009
Maximum 10-min Rain 0.0 mm 17:41 3.3 mm, 2009
Maximum Rain Rate 0.0 mm/h 17:41 33 mm/h, 2009
Minimum Dew Point 10.2 °C 02:04 12.7 °C 14.0 °C, 2016 5.0 °C, 2011
Maximum Dew Point 13.9 °C 20:49 16.7 °C 19.4 °C, 2020 10.0 °C, 2017
Mean Dew Point 11.9 °C 14.8 °C 16.4 °C, 2016 7.9 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.7 °C 02:22 14.5 °C 17.0 °C, 2016 6.7 °C, 2013
Day Maximum (09-21) 18.8 °C 15:30 21.7 °C 29.1 °C, 2020 15.2 °C, 2013
Max 10m Temp Rise 0.5 °C 12:29 0.6 °C 1.0 °C, 2011 0.4 °C, 2015
Max 1hr Temp Rise 1.5 °C 12:26 2.0 °C 4.8 °C, 2011 1.3 °C, 2021
Max 1hr Hum Rise 24% 17:41 9% 24%, 2022 5%, 2015
Max 10m Temp Fall 2.4 °C 17:41 0.7 °C 2.4 °C, 2022 0.2 °C, 2010
Max 1hr Temp Fall 2.4 °C 17:41 1.7 °C 3.0 °C, 2025 0.8 °C, 2010
Max 1hr Hum Fall 10% 12:36 10% 16%, 2023 7%, 2021
Max 10m Wind Speed 6.8 mph 15:15 8.3 mph 19.7 mph, 2025 3.8 mph, 2020
Minimum Feels-like 13.1 °C 02:14 17.2 °C 23.2 °C, 2016 4.7 °C, 2017
Maximum Feels-like 20.9 °C 15:30 26.4 °C 35.3 °C, 2020 16.8 °C, 2017
Mean Feels-like 17.4 °C 21.9 °C 27.0 °C, 2016 11.2 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (-0.3) 7.4 °C (-0.6) 14.0 °C (+6.6), 2019 1.9 °C (-5.5), 2009
Humidity Range 31% 27% 47%, 2011 15%, 2009
Pressure Range 11 hPa 6 hPa 17 hPa, 2013 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [13%]48 hrs (62%) [27%] 10.5 [91%], 2019 0 [0%], 2009
Wet Hours 025 hrs (122%) [6.9%] 11, 2009 0, 2010
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments -
Extra Comments
Issues 18- outage due to powercut
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 17.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 15th 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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