Daily Report for 11th July 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.5 °C (-1.5) 04:33 13.0 °C (-0.7) 17.5 °C (+3.5), 2010 9.8 °C (-4.2), 2020
Maximum Temperature 19.6 °C (-3.4) 19:57 22.1 °C (-0.6) 31.8 °C (+8.8), 2025 19.4 °C (-3.7), 2012
Mean Temperature 15.4 °C (-2.5) 17.6 °C (-0.7) 25.4 °C, 2025 15.2 °C, 2012
Minimum Humidity 82% 20:36 44% 82%, 2014 33%, 2015
Maximum Humidity 94% 09:50 86% 95%, 2009 65%, 2015
Mean Humidity 90% 66% 90%, 2014 48%, 2015
Minimum Pressure 1015 hPa 20:15 1012 hPa 1024 hPa, 2020 1005 hPa, 2016
Maximum Pressure 1018 hPa 11:59 1017 hPa 1029 hPa, 2020 1011 hPa, 2012
Mean Pressure 1017 hPa 1014 hPa 1027 hPa, 2020 1008 hPa, 2016
Mean Wind Speed 2.4 mph (-1.9) 4.0 mph (-0.3) 11.2 mph, 2016 2.1 mph, 2025
Maximum Wind Speed 7.8 mph 00:54 12.1 mph 23.7 mph, 2016 7.8 mph, 2014
Maximum Gust 14.3 mph 00:54 17.8 mph 38.7 mph, 2016 12.3 mph, 2011
Mean Wind Direction NNW
Rainfall 4.4 mm 14.2 mm (87%) 29.7 mm, 2017
Maximum Hourly Rain 2.2 mm 07:35 6.6 mm, 2017
Maximum 10-min Rain 0.6 mm 07:18 4.8 mm, 2017
Maximum Rain Rate 3.6 mm/h 07:18 54 mm/h, 2016
Minimum Dew Point 11.1 °C 02:28 7.1 °C 14.3 °C, 2023 6.0 °C, 2013
Maximum Dew Point 16.8 °C 18:57 13.3 °C 16.8 °C, 2014 9.3 °C, 2013
Mean Dew Point 13.7 °C 10.4 °C 15.0 °C, 2023 7.7 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.5 °C 04:33 13.1 °C 17.5 °C, 2010 9.8 °C, 2020
Day Maximum (09-21) 19.6 °C 19:57 22.1 °C 31.8 °C, 2025 19.4 °C, 2012
Max 10m Temp Rise 0.3 °C 10:39 0.6 °C 0.9 °C, 2013 0.3 °C, 2014
Max 1hr Temp Rise 1.0 °C 17:52 2.1 °C 4.0 °C, 2025 1.0 °C, 2014
Max 1hr Hum Rise 4% 01:04 12% 18%, 2012 4%, 2014
Max 10m Temp Fall 0.3 °C 21:12 0.6 °C 0.9 °C, 2009 0.3 °C, 2014
Max 1hr Temp Fall 1.3 °C 21:43 2.1 °C 3.0 °C, 2012 1.2 °C, 2009
Max 1hr Hum Fall 4% 18:56 12% 15%, 2012 4%, 2014
Max 10m Wind Speed 5.2 mph 01:07 8.8 mph 18.0 mph, 2016 5.2 mph, 2014
Minimum Feels-like 14.3 °C 04:15 14.2 °C 20.8 °C, 2023 8.3 °C, 2020
Maximum Feels-like 24.7 °C 19:33 23.7 °C 36.1 °C, 2025 20.8 °C, 2012
Mean Feels-like 18.7 °C 19.1 °C 29.4 °C, 2025 16.2 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (-1.9) 9.1 °C (+0.0) 15.6 °C (+6.6), 2025 5.0 °C (-4.0), 2017
Humidity Range 12% 42% 52%, 2011 12%, 2014
Pressure Range 3 hPa 5 hPa 6 hPa, 2023 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]71 hrs (100%) [43%] 14.6 [98%], 2025 0 [0%], 2014
Wet Hours 4
[Mean rain rate: 1.1 mm/h]		14 hrs (114%) [5.2%] 8, 2017 0, 2010
Cloud Cover Overcast
Events None
Comments 06-10, 13 Light/Moderate Rain
Extra Comments
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 July 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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose