Daily Report for 24th July 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 19.6 °C (+4.9) 05:28 14.6 °C (+0.5) 19.6 °C (+4.9), 2019 10.6 °C (-4.1), 2011
Maximum Temperature 32.2 °C (+8.9) 15:52 24.4 °C (+1.3) 32.2 °C (+8.9), 2019 16.5 °C (-6.8), 2015
Mean Temperature 26.2 °C (+6.9) 19.6 °C (+0.9) 26.2 °C, 2019 14.4 °C, 2015
Minimum Humidity 33% 17:45 49% 77%, 2023 30%, 2012
Maximum Humidity 89% 06:42 86% 95%, 2024 81%, 2011
Mean Humidity 60% 68% 86%, 2023 50%, 2012
Minimum Pressure 1010 hPa 04:51 1017 hPa 1020 hPa, 2010 1004 hPa, 2015
Maximum Pressure 1016 hPa 23:32 1021 hPa 1024 hPa, 2010 1010 hPa, 2023
Mean Pressure 1013 hPa 1019 hPa 1022 hPa, 2010 1007 hPa, 2023
Mean Wind Speed 4.4 mph (+0.1) 3.9 mph (-0.4) 9.9 mph, 2022 2.2 mph, 2012
Maximum Wind Speed 13.5 mph 12:39 11.3 mph 20.2 mph, 2022 9.2 mph, 2012
Maximum Gust 23.0 mph 17:12 18.0 mph 28.5 mph, 2022 13.0 mph, 2012
Mean Wind Direction SSW
Rainfall 1.1 mm 25.0 mm (70%) 31.9 mm, 2015
Maximum Hourly Rain 0.9 mm 01:51 11.2 mm, 2015
Maximum 10-min Rain 0.7 mm 01:29 2.6 mm, 2015
Maximum Rain Rate 4.4 mm/h 01:26 42 mm/h, 2015
Minimum Dew Point 12.0 °C 20:00 10.5 °C 14.7 °C, 2018 3.4 °C, 2011
Maximum Dew Point 20.2 °C 10:02 15.4 °C 20.2 °C, 2019 10.0 °C, 2011
Mean Dew Point 16.9 °C 13.1 °C 16.9 °C, 2019 6.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 19.6 °C 05:29 14.6 °C 19.6 °C, 2019 10.6 °C, 2011
Day Maximum (09-21) 32.2 °C 16:18 24.4 °C 32.2 °C, 2019 15.8 °C, 2015
Max 10m Temp Rise 1.9 °C 07:30 0.6 °C 1.9 °C, 2019 0.4 °C, 2015
Max 1hr Temp Rise 3.3 °C 08:19 2.2 °C 5.5 °C, 2012 0.5 °C, 2015
Max 1hr Hum Rise 12% 23:31 9% 19%, 2015 4%, 2017
Max 10m Temp Fall 0.7 °C 21:54 0.5 °C 0.9 °C, 2009 0.3 °C, 2016
Max 1hr Temp Fall 2.3 °C 22:04 1.8 °C 3.2 °C, 2009 0.9 °C, 2017
Max 1hr Hum Fall 15% 08:14 10% 18%, 2012 1%, 2015
Max 10m Wind Speed 10.2 mph 16:14 8.2 mph 18.1 mph, 2022 4.3 mph, 2009
Minimum Feels-like 25.2 °C 05:19 16.8 °C 25.2 °C, 2019 10.6 °C, 2011
Maximum Feels-like 38.0 °C 13:18 27.9 °C 38.0 °C, 2019 18.5 °C, 2015
Mean Feels-like 31.5 °C 22.6 °C 31.5 °C, 2019 15.8 °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 12.6 °C (+4.1) 9.7 °C (+0.9) 16.5 °C (+7.9), 2012 2.8 °C (-5.8), 2023
Humidity Range 56% 37% 58%, 2014 13%, 2017
Pressure Range 5 hPa 5 hPa 11 hPa, 2015 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 12 [83%]163 hrs (107%) [46%] 14.4 [100%], 2012 0 [0%], 2015
Wet Hours 2
[Mean rain rate: 0.6 mm/h]		23 hrs (87%) [4%] 11, 2015 0, 2010
Cloud Cover Sunny with periods of Hazy
Events Thunder
Comments o.night Thunder Showers
Extra Comments
Issues weak data til 0730 due to server cpu peg
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 22.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 24th July 2019.
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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Wind rose