Daily Report for 1st September 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.4 °C (-2.5) 04:48 10.4 °C (-2.4) 16.4 °C (+3.5), 2024 6.3 °C (-6.6), 2020
Maximum Temperature 23.7 °C (+2.4) 16:18 23.7 °C (+2.5) 27.4 °C (+6.1), 2024 17.8 °C (-3.5), 2015
Mean Temperature 17.5 °C (-0.0) 17.5 °C (+0.0) 21.1 °C, 2024 13.8 °C, 2020
Minimum Humidity 44% 16:25 44% 76%, 2014 40%, 2013
Maximum Humidity 95% 07:02 95% 96%, 2020 73%, 2013
Mean Humidity 67% 67% 89%, 2023 58%, 2013
Minimum Pressure 1025 hPa 00:06 1025 hPa 1030 hPa, 2021 1003 hPa, 2009
Maximum Pressure 1027 hPa 23:26 1027 hPa 1033 hPa, 2021 1007 hPa, 2025
Mean Pressure 1026 hPa 1026 hPa 1032 hPa, 2021 1005 hPa, 2025
Mean Wind Speed 2.5 mph (-1.4) 2.5 mph (-1.4) 6.3 mph, 2009 0.3 mph, 2020
Maximum Wind Speed 10.5 mph 13:43 10.5 mph 18.8 mph, 2025 5.2 mph, 2020
Maximum Gust 16.1 mph 13:43 16.1 mph 35.6 mph, 2009 8.1 mph, 2020
Mean Wind Direction SSW
Rainfall 0.0 mm 0.0 mm (0%) 5.8 mm, 2025
Maximum Hourly Rain n/a 4.5, 2015
Maximum 10-min Rain n/a 3.1, 2015
Maximum Rain Rate n/a 48, 2015
Minimum Dew Point 8.0 °C 22:38 8.0 °C 14.8 °C, 2024 3.4 °C, 2013
Maximum Dew Point 13.5 °C 10:03 13.5 °C 21.1 °C, 2024 9.8 °C, 2013
Mean Dew Point 10.6 °C 10.6 °C 17.9 °C, 2024 7.0 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.4 °C 05:35 10.4 °C 16.4 °C, 2024 6.3 °C, 2020
Day Maximum (09-21) 23.7 °C 16:26 23.7 °C 27.4 °C, 2024 17.8 °C, 2015
Max 10m Temp Rise 0.8 °C 09:13 0.8 °C 1.0 °C, 2010 0.4 °C, 2014
Max 1hr Temp Rise 3.5 °C 09:22 3.5 °C 4.5 °C, 2010 1.1 °C, 2015
Max 1hr Hum Rise 11% 23:53 11% 21%, 2025 4%, 2014
Max 10m Temp Fall 0.6 °C 23:44 0.6 °C 1.0 °C, 2025 0.2 °C, 2022
Max 1hr Temp Fall 2.8 °C 23:59 2.8 °C 4.0 °C, 2025 0.9 °C, 2021
Max 1hr Hum Fall 16% 09:39 16% 19%, 2020 3%, 2014
Max 10m Wind Speed 7.0 mph 12:26 7.0 mph 12.6 mph, 2025 2.9 mph, 2020
Minimum Feels-like 11.4 °C 04:48 11.4 °C 20.3 °C, 2024 6.3 °C, 2020
Maximum Feels-like 25.8 °C 14:38 25.8 °C 35.8 °C, 2024 20.5 °C, 2015
Mean Feels-like 19.1 °C 19.1 °C 27.1 °C, 2024 14.5 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.3 °C (+4.9) 13.3 °C (+4.9) 13.6 °C (+5.2), 2020 4.3 °C (-4.1), 2021
Humidity Range 51% 51% 51%, 2018 16%, 2021
Pressure Range 2 hPa 2 hPa 8 hPa, 2024 2 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11.9 [96%]12 hrs (225%) [97%] 12.2 [99%], 2010 0 [0%], 2021
Wet Hours 00 hrs (0%) [0%] 5, 2014 0, 2010
Cloud Cover Sunny with periods of Mostly Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 1st September 2018.
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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