Daily Report for 26th August 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.0 °C (-2.5) 23:17 13.5 °C (-0.6) 17.1 °C (+3.6), 2016 8.6 °C (-4.9), 2018
Maximum Temperature 17.0 °C (-4.8) 16:38 21.7 °C (-0.9) 32.0 °C (+10.2), 2019 16.2 °C (-5.6), 2014
Mean Temperature 14.2 °C (-3.6) 17.4 °C (-0.8) 24.0 °C, 2019 13.4 °C, 2018
Minimum Humidity 79% 00:00 51% 87%, 2010 29%, 2016
Maximum Humidity 94% 23:59 86% 98%, 2010 79%, 2020
Mean Humidity 90% 70% 95%, 2010 61%, 2019
Minimum Pressure 1002 hPa 11:24 1010 hPa 1022 hPa, 2021 1001 hPa, 2014
Maximum Pressure 1008 hPa 00:39 1015 hPa 1024 hPa, 2021 1006 hPa, 2010
Mean Pressure 1005 hPa 1013 hPa 1023 hPa, 2021 1004 hPa, 2015
Mean Wind Speed 2.0 mph (-2.0) 4.4 mph (+0.4) 8.2 mph, 2020 0.6 mph, 2022
Maximum Wind Speed 6.9 mph 12.1 mph 22.2 mph, 2020 6.5 mph, 2017
Maximum Gust 9.2 mph 20:21 17.3 mph 38.0 mph, 2020 8.4 mph, 2017
Mean Wind Direction SSE
Rainfall 8.7 mm 72.1 mm (159%) 13.6 mm, 2018
Maximum Hourly Rain 2.2 mm 18:13 7.7 mm, 2023
Maximum 10-min Rain 1.6 mm 15:49 4.8 mm, 2023
Maximum Rain Rate 40 mm/h 15:47 72 mm/h, 2023
Minimum Dew Point 9.7 °C 23:09 8.8 °C 13.4 °C, 2019 5.8 °C, 2012
Maximum Dew Point 15.1 °C 16:32 14.1 °C 18.6 °C, 2016 12.9 °C, 2012
Mean Dew Point 12.6 °C 11.5 °C 16.3 °C, 2010 10.0 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 13.2 °C * 06:15 13.8 °C 17.1 °C, 2016 8.6 °C, 2018
Day Maximum (09-21) 17.0 °C 16:40 21.7 °C 32.0 °C, 2019 16.2 °C, 2014
Max 10m Temp Rise 0.3 °C 16:26 0.6 °C 0.9 °C, 2018 0.2 °C, 2014
Max 1hr Temp Rise 0.8 °C 11:45 2.2 °C 3.5 °C, 2019 0.6 °C, 2014
Max 1hr Hum Rise 5% 22:26 9% 20%, 2009 2%, 2014
Max 10m Temp Fall 0.2 °C 21:32 0.5 °C 1.5 °C, 2023 0.2 °C, 2010
Max 1hr Temp Fall 1.0 °C 21:53 1.7 °C 3.9 °C, 2016 0.7 °C, 2021
Max 1hr Hum Fall 5% 17:19 11% 21%, 2022 5%, 2010
Max 10m Wind Speed 5.8 mph 17:20 8.2 mph 17.5 mph, 2020 4.5 mph, 2022
Minimum Feels-like 12.1 °C 23:04 15.0 °C 18.4 °C, 2019 8.6 °C, 2018
Maximum Feels-like 21.0 °C 16:36 24.1 °C 36.7 °C, 2019 20.2 °C, 2014
Mean Feels-like 16.8 °C 19.5 °C 28.0 °C, 2019 15.6 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.0 °C (-2.3) 8.2 °C (-0.3) 16.6 °C (+8.3), 2019 3.5 °C (-4.8), 2021
Humidity Range 15% 36% 59%, 2016 11%, 2010
Pressure Range 6 hPa 5 hPa 18 hPa, 2020 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [8%]121 hrs (77%) [35%] 12.8 [101%], 2019 0 [0%], 2014
Wet Hours 8
[Mean rain rate: 1.1 mm/h]
38 hrs (118%) [6%] 8, 2010 0, 2012
Cloud Cover unknown
Events Thunder
Comments 00-05 Moderate, 08-12 Light, 16 Very Heavy with Thunder, 18 Heavy Showers
Extra Comments
Issues Data was logged (rather than live) so gusts are unreliable; Sun hours are from Heathrow
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 26th August 2011.
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


Webcam summary not available for this day

Wind rose