Daily Report for 30th July 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.6 °C (+1.0) 05:50 13.6 °C (-0.7) 17.7 °C (+3.1), 2018 9.1 °C (-5.5), 2011
Maximum Temperature 31.0 °C (+7.7) 16:33 22.5 °C (-0.6) 31.0 °C (+7.7), 2024 17.8 °C (-5.5), 2021
Mean Temperature 23.4 °C (+4.3) 18.1 °C (-0.7) 23.4 °C, 2024 15.2 °C, 2015
Minimum Humidity 43% 15:03 61% 74%, 2021 31%, 2020
Maximum Humidity 91% 06:42 92% 95%, 2009 73%, 2014
Mean Humidity 67% 77% 85%, 2013 54%, 2020
Minimum Pressure 1017 hPa 17:28 1012 hPa 1018 hPa, 2022 999 hPa, 2021
Maximum Pressure 1020 hPa 00:03 1018 hPa 1025 hPa, 2011 1008 hPa, 2019
Mean Pressure 1018 hPa 1015 hPa 1022 hPa, 2011 1004 hPa, 2021
Mean Wind Speed 1.0 mph (-3.3) 2.9 mph (-1.4) 7.6 mph, 2019 1.0 mph, 2024
Maximum Wind Speed 7.2 mph 11:44 10.1 mph 19.9 mph, 2019 7.2 mph, 2024
Maximum Gust 10.4 mph 11:21 15.3 mph 36.9 mph, 2019 10.4 mph, 2024
Mean Wind Direction ENE
Rainfall 0.0 mm 113.0 mm (254%) 17.8 mm, 2017
Maximum Hourly Rain n/a 16, 2017
Maximum 10-min Rain n/a 5.1, 2017
Maximum Rain Rate n/a 50, 2017
Minimum Dew Point 13.8 °C 04:58 11.1 °C 13.8 °C, 2024 2.5 °C, 2012
Maximum Dew Point 19.1 °C 11:23 16.1 °C 19.1 °C, 2024 8.9 °C, 2015
Mean Dew Point 16.4 °C 13.7 °C 16.4 °C, 2024 6.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.6 °C 05:47 13.6 °C 18.2 °C, 2019 9.1 °C, 2011
Day Maximum (09-21) 31.0 °C 16:33 22.5 °C 31.0 °C, 2024 17.8 °C, 2021
Max 10m Temp Rise 0.6 °C 06:56 0.6 °C 1.0 °C, 2011 0.4 °C, 2016
Max 1hr Temp Rise 3.0 °C 07:30 2.4 °C 4.5 °C, 2011 1.4 °C, 2013
Max 1hr Hum Rise 9% 21:08 10% 19%, 2020 5%, 2013
Max 10m Temp Fall 0.7 °C 20:10 0.7 °C 0.8 °C, 2021 0.3 °C, 2010
Max 1hr Temp Fall 2.5 °C 20:15 2.0 °C 3.0 °C, 2020 1.2 °C, 2010
Max 1hr Hum Fall 11% 10:05 11% 17%, 2018 8%, 2013
Max 10m Wind Speed 4.1 mph 11:10 7.4 mph 15.9 mph, 2021 4.1 mph, 2024
Minimum Feels-like 18.8 °C 05:28 15.7 °C 20.7 °C, 2018 8.2 °C, 2011
Maximum Feels-like 37.5 °C 16:58 26.7 °C 37.5 °C, 2024 18.8 °C, 2015
Mean Feels-like 28.3 °C 21.4 °C 28.3 °C, 2024 15.4 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 15.4 °C (+6.8) 8.9 °C (+0.1) 16.6 °C (+8.0), 2020 3.1 °C (-5.5), 2021
Humidity Range 48% 31% 56%, 2020 17%, 2021
Pressure Range 3 hPa 6 hPa 12 hPa, 2009 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13 [92%]157 hrs (83%) [36%] 14.2 [100%], 2020 0.4 [3%], 2016
Wet Hours 056 hrs (169%) [7.7%] 8, 2019 0, 2011
Cloud Cover Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 22.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 30th July 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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Webcam Summary of Cloud Conditions

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