Daily Report for 11th August 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.8 °C (-1.6) 05:29 15.0 °C (+0.5) 20.2 °C (+5.8), 2020 8.0 °C (-6.4), 2018
Maximum Temperature 20.7 °C (-2.1) 12:35 23.4 °C (+0.3) 33.4 °C (+10.6), 2020 20.7 °C (-2.1), 2014
Mean Temperature 16.0 °C (-1.8) 19.0 °C (+0.4) 26.9 °C, 2020 15.8 °C, 2018
Minimum Humidity 44% 14:17 44% 67%, 2011 34%, 2022
Maximum Humidity 83% 23:55 85% 97%, 2010 74%, 2013
Mean Humidity 68% 65% 78%, 2011 55%, 2013
Minimum Pressure 1004 hPa 00:16 1006 hPa 1021 hPa, 2022 1004 hPa, 2014
Maximum Pressure 1009 hPa 22:34 1012 hPa 1028 hPa, 2025 1009 hPa, 2014
Mean Pressure 1007 hPa 1009 hPa 1024 hPa, 2025 1007 hPa, 2014
Mean Wind Speed 7.2 mph (+3.2) 5.0 mph (+1.0) 8.1 mph, 2019 0.8 mph, 2015
Maximum Wind Speed 19.0 mph 14:00 13.5 mph 19.4 mph, 2016 5.9 mph, 2015
Maximum Gust 29.7 mph 10:22 19.5 mph 30.0 mph, 2019 7.8 mph, 2015
Mean Wind Direction WSW
Rainfall 7.3 mm 56.9 mm (297%) 7.3 mm, 2014
Maximum Hourly Rain 5.6 mm 16:22 5.6 mm, 2014
Maximum 10-min Rain 3.0 mm 15:39 3.0 mm, 2014
Maximum Rain Rate 90 mm/h 15:36 90 mm/h, 2014
Minimum Dew Point 7.6 °C 14:17 8.5 °C 17.5 °C, 2020 5.7 °C, 2013
Maximum Dew Point 13.4 °C 16:50 15.0 °C 20.6 °C, 2020 13.0 °C, 2017
Mean Dew Point 9.9 °C 11.7 °C 18.8 °C, 2020 9.1 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.8 °C 05:29 15.1 °C 20.2 °C, 2020 8.0 °C, 2018
Day Maximum (09-21) 20.7 °C 12:35 23.4 °C 33.4 °C, 2020 20.7 °C, 2014
Max 10m Temp Rise 0.8 °C 12:00 0.6 °C 1.2 °C, 2020 0.4 °C, 2011
Max 1hr Temp Rise 2.3 °C 08:12 2.1 °C 4.8 °C, 2025 1.5 °C, 2011
Max 1hr Hum Rise 22% 15:55 11% 22%, 2014 6%, 2011
Max 10m Temp Fall 2.3 °C 15:43 0.7 °C 2.3 °C, 2014 0.3 °C, 2012
Max 1hr Temp Fall 4.9 °C 15:53 2.2 °C 4.9 °C, 2014 1.0 °C, 2016
Max 1hr Hum Fall 13% 10:25 13% 19%, 2012 7%, 2015
Max 10m Wind Speed 13.7 mph 14:00 10.3 mph 14.8 mph, 2016 3.7 mph, 2015
Minimum Feels-like 13.6 °C 04:57 16.8 °C 25.9 °C, 2020 6.5 °C, 2018
Maximum Feels-like 21.6 °C 13:16 25.7 °C 40.8 °C, 2020 21.6 °C, 2014
Mean Feels-like 17.3 °C 21.2 °C 33.5 °C, 2020 17.3 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.9 °C (-0.6) 8.4 °C (-0.2) 16.9 °C (+8.4), 2025 6.6 °C (-1.9), 2011
Humidity Range 39% 41% 56%, 2022 22%, 2011
Pressure Range 5 hPa 6 hPa 11 hPa, 2012 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [59%]67 hrs (97%) [44%] 13 [96%], 2022 0.1 [1%], 2015
Wet Hours 3
[Mean rain rate: 2.4 mm/h]		21 hrs (156%) [8%] 3, 2014 0, 2009
Cloud Cover Mostly Sunny with periods of Partly Cloudy
Events Thunder
Comments 11-23 occasional Showers (1530 with Thunder)
Extra Comments rnbows
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 11th August 2014.
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