Daily Report for 31st May 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.8 °C (-1.0) 05:32 9.1 °C (-0.0) 14.8 °C (+4.0), 2018 6.8 °C (-4.0), 2014
Maximum Temperature 17.8 °C (-1.5) 16:29 17.8 °C (-0.1) 25.3 °C (+6.0), 2009 13.2 °C (-6.1), 2016
Mean Temperature 13.2 °C (-1.2) 13.4 °C (-0.0) 18.1 °C, 2017 11.9 °C, 2022
Minimum Humidity 71% 16:37 61% 78%, 2024 35%, 2011
Maximum Humidity 92% 06:39 90% 97%, 2018 78%, 2020
Mean Humidity 81% 77% 88%, 2018 55%, 2020
Minimum Pressure 1026 hPa 18:29 1022 hPa 1026 hPa, 2023 1004 hPa, 2015
Maximum Pressure 1030 hPa 00:39 1026 hPa 1030 hPa, 2023 1012 hPa, 2015
Mean Pressure 1028 hPa 1024 hPa 1028 hPa, 2023 1007 hPa, 2015
Mean Wind Speed 6.5 mph (+1.8) 4.9 mph (+0.2) 7.2 mph, 2016 1.0 mph, 2014
Maximum Wind Speed 14.4 mph 18:13 12.6 mph 17.0 mph, 2015 6.4 mph, 2014
Maximum Gust 20.7 mph 19:22 18.8 mph 26.5 mph, 2020 8.7 mph, 2014
Mean Wind Direction E
Rainfall 0.0 mm 25.2 mm (55%) 12.4 mm, 2016
Maximum Hourly Rain n/a 5.8, 2016
Maximum 10-min Rain n/a 1.3, 2016
Maximum Rain Rate n/a 24, 2016
Minimum Dew Point 7.9 °C 01:18 6.9 °C 14.2 °C, 2018 0.2 °C, 2015
Maximum Dew Point 12.9 °C 16:27 11.6 °C 18.2 °C, 2018 8.8 °C, 2011
Mean Dew Point 10.0 °C 9.2 °C 15.9 °C, 2018 5.1 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.8 °C 05:37 9.3 °C 14.8 °C, 2018 6.8 °C, 2014
Day Maximum (09-21) 17.8 °C 16:19 17.8 °C 25.3 °C, 2009 12.9 °C, 2016
Max 10m Temp Rise 0.6 °C 14:45 0.6 °C 1.0 °C, 2021 0.3 °C, 2016
Max 1hr Temp Rise 1.4 °C 09:31 2.1 °C 4.4 °C, 2021 0.8 °C, 2016
Max 1hr Hum Rise 5% 02:32 9% 17%, 2022 4%, 2018
Max 10m Temp Fall 0.6 °C 18:53 0.5 °C 1.6 °C, 2022 0.2 °C, 2016
Max 1hr Temp Fall 1.9 °C 19:42 1.8 °C 3.1 °C, 2022 0.6 °C, 2016
Max 1hr Hum Fall 6% 09:13 9% 18%, 2014 2%, 2016
Max 10m Wind Speed 10.8 mph 15:56 9.3 mph 12.8 mph, 2015 3.9 mph, 2014
Minimum Feels-like 7.0 °C 04:57 7.8 °C 18.3 °C, 2018 5.6 °C, 2011
Maximum Feels-like 20.5 °C 16:27 19.6 °C 28.6 °C, 2018 14.7 °C, 2016
Mean Feels-like 14.4 °C 14.2 °C 22.7 °C, 2018 12.4 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.0 °C (-0.5) 8.7 °C (-0.1) 15.3 °C (+6.8), 2021 2.3 °C (-6.2), 2016
Humidity Range 21% 29% 52%, 2011 13%, 2024
Pressure Range 3 hPa 5 hPa 15 hPa, 2011 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [34%]188 hrs (99%) [43%] 14.8 [100%], 2020 0 [0%], 2016
Wet Hours 025 hrs (61%) [3.3%] 7, 2015 0, 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 17.2 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 31st May 2023.
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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