Daily Report for 9th August 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.4 °C (+3.0) 23:58 15.7 °C (+1.3) 17.4 °C (+3.0), 2019 10.7 °C (-3.7), 2023
Maximum Temperature 24.6 °C (+1.7) 15:54 24.5 °C (+1.5) 31.7 °C (+8.8), 2020 15.4 °C (-7.5), 2017
Mean Temperature 20.9 °C (+2.4) 19.9 °C (+1.4) 23.7 °C, 2020 13.9 °C, 2017
Minimum Humidity 54% 20:31 58% 78%, 2017 30%, 2015
Maximum Humidity 92% 07:00 91% 98%, 2023 71%, 2011
Mean Humidity 72% 76% 86%, 2021 52%, 2016
Minimum Pressure 1011 hPa 01:43 1012 hPa 1029 hPa, 2022 999 hPa, 2019
Maximum Pressure 1020 hPa 23:00 1016 hPa 1032 hPa, 2022 1008 hPa, 2019
Mean Pressure 1015 hPa 1014 hPa 1030 hPa, 2022 1002 hPa, 2019
Mean Wind Speed 5.9 mph (+1.9) 3.6 mph (-0.4) 7.9 mph, 2019 1.7 mph, 2022
Maximum Wind Speed 13.0 mph 02:49 11.1 mph 20.5 mph, 2019 7.4 mph, 2012
Maximum Gust 21.8 mph 04:51 17.2 mph 36.9 mph, 2019 8.7 mph, 2012
Mean Wind Direction W
Rainfall 0.0 mm 6.0 mm (38%) 39.1 mm, 2017
Maximum Hourly Rain n/a 11.2, 2017
Maximum 10-min Rain n/a 4.8, 2019
Maximum Rain Rate n/a 79, 2019
Minimum Dew Point 11.4 °C 20:38 12.0 °C 15.2 °C, 2019 3.3 °C, 2016
Maximum Dew Point 17.6 °C 00:36 18.1 °C 20.2 °C, 2020 8.3 °C, 2016
Mean Dew Point 15.3 °C 15.3 °C 17.2 °C, 2020 5.5 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.4 °C * 07:21 16.1 °C 18.4 °C, 2019 10.7 °C, 2023
Day Maximum (09-21) 24.6 °C 16:00 24.5 °C 31.7 °C, 2020 15.4 °C, 2017
Max 10m Temp Rise 0.5 °C 12:42 0.7 °C 1.1 °C, 2012 0.2 °C, 2017
Max 1hr Temp Rise 1.5 °C 12:07 2.3 °C 5.0 °C, 2012 0.6 °C, 2018
Max 1hr Hum Rise 10% 21:58 9% 20%, 2019 2%, 2017
Max 10m Temp Fall 0.5 °C 19:50 0.5 °C 1.5 °C, 2019 0.2 °C, 2017
Max 1hr Temp Fall 2.1 °C 20:34 2.1 °C 3.8 °C, 2019 0.8 °C, 2017
Max 1hr Hum Fall 11% 09:00 10% 18%, 2014 1%, 2017
Max 10m Wind Speed 8.6 mph 02:49 8.0 mph 16.4 mph, 2019 4.8 mph, 2009
Minimum Feels-like 19.7 °C 23:58 18.3 °C 21.5 °C, 2019 11.5 °C, 2016
Maximum Feels-like 28.7 °C 15:53 29.8 °C 38.9 °C, 2020 18.3 °C, 2017
Mean Feels-like 25.1 °C 24.1 °C 29.1 °C, 2020 15.7 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.2 °C (-1.3) 8.8 °C (+0.2) 14.8 °C (+6.3), 2020 2.3 °C (-6.2), 2017
Humidity Range 38% 33% 57%, 2012 8%, 2017
Pressure Range 8 hPa 4 hPa 13 hPa, 2017 3 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [73%]45 hrs (80%) [36%] 13 [95%], 2022 0 [0%], 2017
Wet Hours 05 hrs (45%) [2.3%] 16, 2017 0, 2009
Cloud Cover unknown
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 9th August 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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