Daily Report for 26th July 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 19.6 °C (+4.9) 09:36 15.0 °C (+0.8) 19.6 °C (+4.9), 2019 9.4 °C (-5.3), 2023
Maximum Temperature 25.2 °C (+1.9) 01:06 24.9 °C (+1.8) 33.9 °C (+10.6), 2018 16.6 °C (-6.7), 2015
Mean Temperature 22.4 °C (+3.4) 20.0 °C (+1.3) 26.6 °C, 2018 14.5 °C, 2015
Minimum Humidity 59% 03:10 48% 66%, 2017 30%, 2018
Maximum Humidity 89% 09:51 86% 96%, 2021 75%, 2012
Mean Humidity 74% 68% 82%, 2021 53%, 2012
Minimum Pressure 1010 hPa 04:41 1016 hPa 1019 hPa, 2016 996 hPa, 2015
Maximum Pressure 1013 hPa 11:39 1021 hPa 1023 hPa, 2009 1012 hPa, 2021
Mean Pressure 1011 hPa 1018 hPa 1020 hPa, 2016 1005 hPa, 2015
Mean Wind Speed 3.7 mph (-0.6) 3.9 mph (-0.4) 6.1 mph, 2009 1.4 mph, 2021
Maximum Wind Speed 12.6 mph 04:32 11.5 mph 15.2 mph, 2017 6.7 mph, 2021
Maximum Gust 19.5 mph 04:29 18.3 mph 24.1 mph, 2017 10.3 mph, 2021
Mean Wind Direction WSW
Rainfall 2.0 mm 27.0 mm (70%) 7.7 mm, 2023
Maximum Hourly Rain 1.1 mm 04:44 3.4 mm, 2015
Maximum 10-min Rain 1.1 mm 04:44 1.1 mm, 2019
Maximum Rain Rate 13 mm/h 04:40 18 mm/h, 2020
Minimum Dew Point 15.6 °C 03:13 10.9 °C 15.6 °C, 2019 7.3 °C, 2015
Maximum Dew Point 19.3 °C 01:08 15.8 °C 19.6 °C, 2018 12.5 °C, 2011
Mean Dew Point 17.6 °C 13.5 °C 17.6 °C, 2019 10.8 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 19.7 °C * 08:53 15.0 °C 19.7 °C, 2019 9.4 °C, 2023
Day Maximum (09-21) * 24.8 °C * 17:33 24.8 °C 33.9 °C, 2018 16.6 °C, 2015
Max 10m Temp Rise 0.7 °C 09:58 0.6 °C 0.7 °C, 2013 0.3 °C, 2015
Max 1hr Temp Rise 1.8 °C 14:38 2.2 °C 3.3 °C, 2018 1.3 °C, 2015
Max 1hr Hum Rise 18% 05:11 10% 23%, 2020 5%, 2011
Max 10m Temp Fall 0.9 °C 04:50 0.5 °C 1.8 °C, 2020 0.3 °C, 2015
Max 1hr Temp Fall 2.3 °C 05:29 1.8 °C 3.1 °C, 2020 0.8 °C, 2015
Max 1hr Hum Fall 12% 03:05 11% 15%, 2020 2%, 2015
Max 10m Wind Speed 9.4 mph 10:11 8.3 mph 12.2 mph, 2017 4.2 mph, 2009
Minimum Feels-like 24.9 °C 09:03 17.4 °C 24.9 °C, 2019 9.7 °C, 2023
Maximum Feels-like 32.2 °C 01:07 28.7 °C 38.7 °C, 2018 20.6 °C, 2015
Mean Feels-like 28.1 °C 23.2 °C 31.9 °C, 2018 16.4 °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 5.6 °C (-3.0) 9.9 °C (+1.0) 14.8 °C (+6.2), 2018 3.6 °C (-4.9), 2015
Humidity Range 30% 37% 61%, 2018 19%, 2017
Pressure Range 4 hPa 5 hPa 20 hPa, 2015 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [10%]174 hrs (105%) [45%] 14.3 [100%], 2012 0 [0%], 2015
Wet Hours 3
[Mean rain rate: 0.7 mm/h]		26 hrs (92%) [4.2%] 7, 2015 0, 2011
Cloud Cover Overcast with periods of Mostly Cloudy
Events Light Thunderstorm
Comments am Thunder Showers
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 23.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 26th 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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