Daily Report for 21st June 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.3 °C (-2.2) 05:16 9.7 °C (-2.1) 15.8 °C (+3.3), 2023 9.4 °C (-3.1), 2022
Maximum Temperature 24.6 °C (+3.1) 14:37 19.4 °C (-1.3) 33.0 °C (+11.5), 2017 13.7 °C (-7.8), 2021
Mean Temperature 18.5 °C (+0.5) 14.9 °C (-1.7) 24.5 °C, 2017 12.6 °C, 2021
Minimum Humidity 46% 14:42 55% 85%, 2021 34%, 2018
Maximum Humidity 95% 06:12 90% 95%, 2024 69%, 2014
Mean Humidity 67% 74% 88%, 2021 51%, 2014
Minimum Pressure 1012 hPa 18:16 1013 hPa 1023 hPa, 2009 1001 hPa, 2012
Maximum Pressure 1019 hPa 00:29 1019 hPa 1030 hPa, 2018 1011 hPa, 2011
Mean Pressure 1015 hPa 1016 hPa 1026 hPa, 2018 1006 hPa, 2012
Mean Wind Speed 5.0 mph (+0.6) 4.7 mph (+0.3) 8.2 mph, 2011 0.9 mph, 2022
Maximum Wind Speed 18.7 mph 18:16 13.0 mph 19.7 mph, 2011 7.5 mph, 2010
Maximum Gust 26.5 mph 18:17 20.2 mph 32.9 mph, 2011 10.6 mph, 2010
Mean Wind Direction W
Rainfall 0.0 mm 11.6 mm (35%) 6.9 mm, 2012
Maximum Hourly Rain n/a 4.3, 2012
Maximum 10-min Rain n/a 4.3, 2012
Maximum Rain Rate n/a 90, 2013
Minimum Dew Point 9.0 °C 03:36 7.4 °C 14.2 °C, 2023 3.7 °C, 2018
Maximum Dew Point 14.0 °C 10:11 12.3 °C 18.9 °C, 2017 9.2 °C, 2018
Mean Dew Point 11.8 °C 9.9 °C 16.1 °C, 2017 5.9 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.3 °C 05:13 9.9 °C 15.8 °C, 2023 9.4 °C, 2022
Day Maximum (09-21) 24.6 °C 14:48 19.4 °C 33.0 °C, 2017 13.7 °C, 2021
Max 10m Temp Rise 1.0 °C 06:17 0.7 °C 1.0 °C, 2012 0.2 °C, 2021
Max 1hr Temp Rise 4.7 °C 07:04 2.6 °C 4.7 °C, 2024 0.6 °C, 2021
Max 1hr Hum Rise 10% 21:04 11% 16%, 2014 4%, 2021
Max 10m Temp Fall 0.6 °C 13:11 0.7 °C 0.8 °C, 2013 0.3 °C, 2016
Max 1hr Temp Fall 2.1 °C 19:42 2.1 °C 2.7 °C, 2013 0.7 °C, 2021
Max 1hr Hum Fall 17% 07:16 12% 17%, 2024 4%, 2021
Max 10m Wind Speed 11.7 mph 18:51 9.3 mph 15.0 mph, 2011 3.7 mph, 2022
Minimum Feels-like 11.2 °C 05:01 9.3 °C 19.3 °C, 2023 9.7 °C, 2022
Maximum Feels-like 27.5 °C 16:52 21.2 °C 38.7 °C, 2017 16.0 °C, 2021
Mean Feels-like 20.7 °C 16.2 °C 29.3 °C, 2017 14.2 °C, 2021
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 14.3 °C (+5.3) 9.7 °C (+0.7) 17.4 °C (+8.3), 2017 2.5 °C (-6.5), 2021
Humidity Range 49% 35% 57%, 2022 8%, 2021
Pressure Range 8 hPa 6 hPa 10 hPa, 2012 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11 [73%]134 hrs (99%) [42%] 14 [93%], 2017 0 [0%], 2021
Wet Hours 015 hrs (58%) [3%] 6, 2021 0, 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 18.2 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 21st June 2024.
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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