Daily Report for 18th June 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.9 °C (+3.7) 05:33 11.8 °C (+0.2) 18.8 °C (+6.6), 2017 10.9 °C (-1.3), 2010
Maximum Temperature 27.4 °C (+6.2) 13:08 24.2 °C (+3.7) 31.8 °C (+10.6), 2017 16.2 °C (-5.0), 2021
Mean Temperature 20.2 °C (+5.0) 17.8 °C (+2.0) 25.9 °C, 2017 13.9 °C, 2010
Minimum Humidity 59% 13:00 50% 92%, 2021 39%, 2017
Maximum Humidity 90% 05:58 86% 96%, 2021 74%, 2017
Mean Humidity 80% 70% 94%, 2021 54%, 2017
Minimum Pressure 1008 hPa 19:24 1018 hPa 1024 hPa, 2014 996 hPa, 2011
Maximum Pressure 1014 hPa 01:32 1022 hPa 1027 hPa, 2014 1005 hPa, 2011
Mean Pressure 1010 hPa 1020 hPa 1026 hPa, 2014 1000 hPa, 2011
Mean Wind Speed 4.1 mph (-0.3) 5.1 mph (+0.7) 7.8 mph, 2018 1.1 mph, 2017
Maximum Wind Speed 12.4 mph 13:32 13.8 mph 16.6 mph, 2011 5.7 mph, 2017
Maximum Gust 19.6 mph 14:19 21.0 mph 26.2 mph, 2022 8.4 mph, 2017
Mean Wind Direction SSW
Rainfall 2.2 mm 16.1 mm (57%) 20.7 mm, 2020
Maximum Hourly Rain 1.6 mm 18:09 6.0 mm, 2021
Maximum 10-min Rain 0.5 mm 17:40 2.5 mm, 2020
Maximum Rain Rate 2.1 mm/h 18:09 30 mm/h, 2012
Minimum Dew Point 13.3 °C 01:00 8.3 °C 13.8 °C, 2017 4.7 °C, 2015
Maximum Dew Point 19.6 °C 12:49 15.3 °C 19.6 °C, 2023 11.2 °C, 2012
Mean Dew Point 16.4 °C 11.7 °C 16.4 °C, 2023 8.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.9 °C 05:34 11.8 °C 18.8 °C, 2017 10.9 °C, 2010
Day Maximum (09-21) 27.4 °C 13:03 24.2 °C 31.8 °C, 2017 14.4 °C, 2021
Max 10m Temp Rise 0.7 °C 08:31 0.7 °C 0.8 °C, 2013 0.3 °C, 2021
Max 1hr Temp Rise 2.9 °C 09:06 2.6 °C 2.9 °C, 2023 0.4 °C, 2021
Max 1hr Hum Rise 10% 17:17 11% 17%, 2011 2%, 2021
Max 10m Temp Fall 0.6 °C 13:49 0.7 °C 1.1 °C, 2022 0.3 °C, 2009
Max 1hr Temp Fall 1.8 °C 17:05 2.3 °C 2.6 °C, 2022 0.8 °C, 2021
Max 1hr Hum Fall 10% 09:21 11% 16%, 2009 2%, 2021
Max 10m Wind Speed 10.4 mph 14:41 10.2 mph 12.8 mph, 2011 3.7 mph, 2017
Minimum Feels-like 19.3 °C 05:14 12.2 °C 22.1 °C, 2017 10.9 °C, 2010
Maximum Feels-like 34.5 °C 12:48 27.8 °C 36.7 °C, 2017 18.2 °C, 2016
Mean Feels-like 25.1 °C 20.0 °C 30.3 °C, 2017 15.1 °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 11.5 °C (+2.5) 12.4 °C (+3.5) 13.0 °C (+4.0), 2017 4.1 °C (-4.9), 2016
Humidity Range 31% 36% 47%, 2018 4%, 2021
Pressure Range 5 hPa 3 hPa 11 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [20%]173 hrs (150%) [64%] 11 [73%], 2017 0 [0%], 2021
Wet Hours 3
[Mean rain rate: 0.7 mm/h]
4 hrs (18%) [0.9%] 13, 2020 0, 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 21.1 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 18th June 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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