Daily Report for 13th August 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (-2.6) 06:14 13.5 °C (-0.9) 18.1 °C (+3.8), 2020 10.8 °C (-3.5), 2019
Maximum Temperature 22.9 °C (+0.2) 18:06 20.7 °C (-2.3) 33.2 °C (+10.5), 2022 18.1 °C (-4.6), 2010
Mean Temperature 17.7 °C (-1.2) 17.1 °C (-1.6) 25.5 °C, 2022 14.3 °C, 2010
Minimum Humidity 33% 18:37 52% 69%, 2015 27%, 2022
Maximum Humidity 70% 07:13 82% 94%, 2018 70%, 2017
Mean Humidity 51% 68% 87%, 2015 51%, 2017
Minimum Pressure 1019 hPa 00:11 1014 hPa 1021 hPa, 2016 1004 hPa, 2014
Maximum Pressure 1023 hPa 10:27 1019 hPa 1024 hPa, 2016 1008 hPa, 2014
Mean Pressure 1021 hPa 1016 hPa 1022 hPa, 2021 1005 hPa, 2014
Mean Wind Speed 1.6 mph (-2.4) 4.4 mph (+0.4) 7.4 mph, 2023 1.6 mph, 2017
Maximum Wind Speed 6.8 mph 17:23 12.2 mph 20.7 mph, 2025 6.8 mph, 2017
Maximum Gust 10.5 mph 00:36 18.9 mph 29.0 mph, 2016 10.0 mph, 2009
Mean Wind Direction NNW
Rainfall 0.0 mm 50.8 mm (224%) 10.4 mm, 2015
Maximum Hourly Rain n/a 5, 2015
Maximum 10-min Rain n/a 2.5, 2010
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 4.5 °C 19:56 8.1 °C 16.9 °C, 2020 4.5 °C, 2017
Maximum Dew Point 9.6 °C 09:02 13.2 °C 20.8 °C, 2020 9.6 °C, 2017
Mean Dew Point 6.9 °C 10.7 °C 18.5 °C, 2020 6.9 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.7 °C 06:14 13.7 °C 20.1 °C, 2020 10.8 °C, 2019
Day Maximum (09-21) 22.9 °C 18:06 20.7 °C 33.2 °C, 2022 18.1 °C, 2010
Max 10m Temp Rise 0.6 °C 17:09 0.5 °C 1.0 °C, 2009 0.4 °C, 2015
Max 1hr Temp Rise 2.8 °C 08:01 2.0 °C 3.9 °C, 2025 1.3 °C, 2009
Max 1hr Hum Rise 9% 20:41 7% 18%, 2019 5%, 2016
Max 10m Temp Fall 0.7 °C 20:31 0.6 °C 1.2 °C, 2009 0.3 °C, 2015
Max 1hr Temp Fall 2.5 °C 23:06 1.8 °C 2.6 °C, 2025 1.0 °C, 2015
Max 1hr Hum Fall 9% 10:02 9% 15%, 2013 6%, 2021
Max 10m Wind Speed 4.4 mph 00:44 9.0 mph 12.5 mph, 2023 4.4 mph, 2017
Minimum Feels-like 11.7 °C 06:08 14.5 °C 23.3 °C, 2020 11.6 °C, 2019
Maximum Feels-like 22.9 °C 17:56 22.9 °C 37.1 °C, 2022 20.4 °C, 2013
Mean Feels-like 17.9 °C 18.7 °C 29.0 °C, 2022 16.4 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.2 °C (+2.8) 7.2 °C (-1.4) 15.3 °C (+6.9), 2022 4.2 °C (-4.2), 2015
Humidity Range 37% 29% 55%, 2022 23%, 2025
Pressure Range 4 hPa 6 hPa 12 hPa, 2015 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13 [97%]67 hrs (83%) [37%] 13 [97%], 2017 0 [0%], 2015
Wet Hours 023 hrs (144%) [7.4%] 4, 2015 0, 2012
Cloud Cover am: Sunny
pm: Mostly Sunny
Events Maximum possible sunshine
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th August 2017.
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