Daily Report for 29th July 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.1 °C (+1.4) 05:43 14.9 °C (+0.7) 16.6 °C (+1.9), 2016 10.5 °C (-4.2), 2015
Maximum Temperature 22.8 °C (-0.5) 14:38 26.0 °C (+3.0) 28.4 °C (+5.1), 2024 18.9 °C (-4.4), 2012
Mean Temperature 19.0 °C (+0.5) 20.5 °C (+1.8) 21.6 °C, 2024 14.8 °C, 2012
Minimum Humidity 49% 16:57 40% 69%, 2018 34%, 2014
Maximum Humidity 89% 06:34 81% 93%, 2018 79%, 2010
Mean Humidity 71% 60% 84%, 2018 59%, 2014
Minimum Pressure 1009 hPa 02:12 1018 hPa 1022 hPa, 2011 1004 hPa, 2018
Maximum Pressure 1015 hPa 22:53 1022 hPa 1026 hPa, 2024 1010 hPa, 2023
Mean Pressure 1010 hPa 1020 hPa 1024 hPa, 2011 1007 hPa, 2018
Mean Wind Speed 7.3 mph (+3.0) 3.9 mph (-0.4) 8.4 mph, 2018 1.1 mph, 2022
Maximum Wind Speed 17.5 mph 14:02 11.2 mph 18.9 mph, 2018 7.3 mph, 2022
Maximum Gust 28.6 mph 14:02 16.2 mph 36.0 mph, 2009 11.5 mph, 2025
Mean Wind Direction SW
Rainfall 1.8 mm 28.4 mm (66%) 7.4 mm, 2017
Maximum Hourly Rain 1.5 mm 01:01 3.9 mm, 2017
Maximum 10-min Rain 1.2 mm 00:10 2.5 mm, 2012
Maximum Rain Rate 18 mm/h 00:05 80 mm/h, 2017
Minimum Dew Point 10.2 °C 18:58 9.1 °C 12.9 °C, 2016 4.2 °C, 2012
Maximum Dew Point 15.7 °C 11:53 14.7 °C 18.3 °C, 2018 9.9 °C, 2015
Mean Dew Point 13.2 °C 11.8 °C 15.1 °C, 2018 7.5 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 16.1 °C 05:43 15.0 °C 16.6 °C, 2016 10.5 °C, 2015
Day Maximum (09-21) 22.8 °C 14:38 26.0 °C 28.4 °C, 2024 18.9 °C, 2012
Max 10m Temp Rise 0.6 °C 11:47 0.7 °C 0.8 °C, 2012 0.3 °C, 2018
Max 1hr Temp Rise 2.6 °C 12:29 2.4 °C 3.8 °C, 2022 1.1 °C, 2018
Max 1hr Hum Rise 11% 19:57 9% 20%, 2012 5%, 2025
Max 10m Temp Fall 0.7 °C 19:12 0.5 °C 1.6 °C, 2012 0.3 °C, 2010
Max 1hr Temp Fall 2.1 °C 19:28 2.0 °C 3.8 °C, 2012 1.2 °C, 2015
Max 1hr Hum Fall 17% 12:47 11% 17%, 2013 4%, 2018
Max 10m Wind Speed 13.6 mph 15:42 8.0 mph 13.6 mph, 2013 4.0 mph, 2022
Minimum Feels-like 19.4 °C 22:59 16.7 °C 20.2 °C, 2016 10.7 °C, 2015
Maximum Feels-like 25.6 °C 12:43 28.6 °C 32.8 °C, 2024 19.2 °C, 2015
Mean Feels-like 22.0 °C 22.8 °C 25.3 °C, 2024 15.2 °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 6.7 °C (-1.9) 11.1 °C (+2.3) 14.7 °C (+6.1), 2024 4.2 °C (-4.4), 2018
Humidity Range 40% 41% 50%, 2014 24%, 2018
Pressure Range 6 hPa 5 hPa 7 hPa, 2009 1 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [42%]254 hrs (139%) [60%] 13.9 [98%], 2024 0 [0%], 2018
Wet Hours 1
[Mean rain rate: 1.8 mm/h]		12 hrs (39%) [1.8%] 6, 2017 0, 2010
Cloud Cover Partly Cloudy
Events Thunder
Comments 00 Heavy Shower; 11, 19 (w Thunder), 21 Light brief Showers
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 29th July 2013.
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