Daily Report for 17th May 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.7 °C (-0.4) 05:39 9.4 °C (+1.2) 12.2 °C (+3.1), 2017 5.7 °C (-3.4), 2010
Maximum Temperature 17.3 °C (-0.6) 16:07 17.0 °C (-0.1) 25.9 °C (+8.0), 2022 11.6 °C (-6.3), 2013
Mean Temperature 13.2 °C (-0.5) 13.1 °C (+0.5) 19.4 °C, 2022 9.7 °C, 2013
Minimum Humidity 57% 12:29 65% 78%, 2017 37%, 2015
Maximum Humidity 86% 05:58 91% 96%, 2024 76%, 2015
Mean Humidity 76% 80% 87%, 2021 54%, 2015
Minimum Pressure 1028 hPa 02:29 1018 hPa 1028 hPa, 2023 998 hPa, 2021
Maximum Pressure 1030 hPa 09:42 1023 hPa 1030 hPa, 2023 1010 hPa, 2009
Mean Pressure 1029 hPa 1021 hPa 1029 hPa, 2023 1006 hPa, 2013
Mean Wind Speed 3.3 mph (-1.4) 4.8 mph (+0.1) 9.6 mph, 2009 1.2 mph, 2014
Maximum Wind Speed 8.2 mph 12:42 12.4 mph 14.1 mph, 2021 6.4 mph, 2014
Maximum Gust 13.8 mph 14:55 18.2 mph 33.0 mph, 2009 8.7 mph, 2014
Mean Wind Direction NE
Rainfall 0.0 mm 25.2 mm (100%) 35.6 mm, 2017
Maximum Hourly Rain n/a 6.9, 2017
Maximum 10-min Rain n/a 2.4, 2021
Maximum Rain Rate n/a 32.8, 2009
Minimum Dew Point 6.2 °C 00:45 7.5 °C 10.1 °C, 2017 0.6 °C, 2012
Maximum Dew Point 11.4 °C 17:00 11.7 °C 16.2 °C, 2017 5.5 °C, 2012
Mean Dew Point 8.8 °C 9.6 °C 13.6 °C, 2017 3.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.7 °C 05:40 9.7 °C 16.0 °C, 2017 5.7 °C, 2010
Day Maximum (09-21) 17.3 °C 15:33 16.9 °C 25.9 °C, 2022 11.6 °C, 2013
Max 10m Temp Rise 0.5 °C 10:28 0.6 °C 5.6 °C, 2024 0.4 °C, 2019
Max 1hr Temp Rise 1.9 °C 07:32 2.0 °C 8.4 °C, 2024 1.2 °C, 2019
Max 1hr Hum Rise 10% 17:00 9% 22%, 2021 4%, 2017
Max 10m Temp Fall 0.4 °C 12:51 0.5 °C 2.5 °C, 2021 0.3 °C, 2019
Max 1hr Temp Fall 1.4 °C 19:18 1.8 °C 4.7 °C, 2021 0.9 °C, 2019
Max 1hr Hum Fall 8% 11:39 8% 31%, 2024 4%, 2017
Max 10m Wind Speed 6.0 mph 18:26 9.3 mph 11.3 mph, 2022 4.9 mph, 2014
Minimum Feels-like 6.9 °C 04:26 8.5 °C 13.5 °C, 2017 2.5 °C, 2018
Maximum Feels-like 18.7 °C 16:11 18.9 °C 30.1 °C, 2022 11.6 °C, 2013
Mean Feels-like 13.7 °C 14.0 °C 22.2 °C, 2022 9.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.6 °C (-0.1) 7.6 °C (-1.3) 15.5 °C (+6.8), 2022 5.5 °C (-3.2), 2013
Humidity Range 29% 26% 53%, 2020 11%, 2017
Pressure Range 2 hPa 5 hPa 14 hPa, 2012 2 hPa, 2020
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [42%]78 hrs (77%) [33%] 13 [91%], 2018 0 [0%], 2017
Wet Hours 025 hrs (112%) [6%] 14, 2017 0, 2010
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 16.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 17th 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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Webcam Summary of Cloud Conditions

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