Daily Report for 14th August 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.6 °C (-3.7) 04:46 13.3 °C (-1.1) 18.1 °C (+3.8), 2022 10.6 °C (-3.7), 2017
Maximum Temperature 24.4 °C (+1.8) 15:07 21.0 °C (-2.0) 32.2 °C (+9.6), 2022 17.0 °C (-5.6), 2019
Mean Temperature 18.0 °C (-1.0) 17.1 °C (-1.6) 25.4 °C, 2022 14.8 °C, 2010
Minimum Humidity 42% 16:25 52% 85%, 2020 29%, 2022
Maximum Humidity 80% 07:33 82% 95%, 2009 67%, 2016
Mean Humidity 58% 67% 91%, 2020 51%, 2016
Minimum Pressure 1014 hPa 00:14 1014 hPa 1023 hPa, 2016 1005 hPa, 2011
Maximum Pressure 1021 hPa 01:58 1019 hPa 1026 hPa, 2016 1009 hPa, 2015
Mean Pressure 1017 hPa 1016 hPa 1024 hPa, 2016 1006 hPa, 2015
Mean Wind Speed 2.6 mph (-1.4) 4.3 mph (+0.3) 5.9 mph, 2023 1.0 mph, 2022
Maximum Wind Speed 10.6 mph 13:15 12.1 mph 17.2 mph, 2023 7.3 mph, 2020
Maximum Gust 15.7 mph 12:23 18.6 mph 23.0 mph, 2019 11.5 mph, 2020
Mean Wind Direction SW
Rainfall 0.0 mm 50.8 mm (208%) 13.4 mm, 2019
Maximum Hourly Rain n/a 4.8, 2019
Maximum 10-min Rain n/a 2.5, 2010
Maximum Rain Rate n/a 42, 2014
Minimum Dew Point 5.7 °C 03:33 7.9 °C 15.6 °C, 2020 5.7 °C, 2017
Maximum Dew Point 12.0 °C 10:08 13.1 °C 18.2 °C, 2015 9.8 °C, 2016
Mean Dew Point 9.1 °C 10.6 °C 16.5 °C, 2020 8.7 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.6 °C 04:46 13.5 °C 18.1 °C, 2022 10.6 °C, 2017
Day Maximum (09-21) 24.4 °C 15:07 21.0 °C 32.2 °C, 2022 16.9 °C, 2019
Max 10m Temp Rise 0.9 °C 07:31 0.6 °C 1.1 °C, 2009 0.3 °C, 2020
Max 1hr Temp Rise 4.1 °C 08:18 2.1 °C 4.6 °C, 2013 0.9 °C, 2020
Max 1hr Hum Rise 6% 23:34 7% 16%, 2014 2%, 2020
Max 10m Temp Fall 0.3 °C 15:28 0.6 °C 1.3 °C, 2009 0.2 °C, 2020
Max 1hr Temp Fall 1.4 °C 23:34 1.7 °C 3.3 °C, 2022 0.6 °C, 2020
Max 1hr Hum Fall 11% 08:50 9% 19%, 2013 4%, 2020
Max 10m Wind Speed 8.1 mph 12:27 8.9 mph 11.4 mph, 2023 4.2 mph, 2020
Minimum Feels-like 10.6 °C 03:55 14.2 °C 22.0 °C, 2012 10.6 °C, 2017
Maximum Feels-like 26.4 °C 14:58 23.1 °C 35.5 °C, 2022 21.4 °C, 2010
Mean Feels-like 18.9 °C 18.8 °C 28.7 °C, 2022 17.5 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 13.8 °C (+5.5) 7.7 °C (-0.9) 14.1 °C (+5.8), 2022 2.5 °C (-5.8), 2020
Humidity Range 38% 30% 47%, 2022 9%, 2020
Pressure Range 7 hPa 6 hPa 10 hPa, 2019 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8.3 [62%]75 hrs (87%) [39%] 10 [75%], 2022 0 [0%], 2020
Wet Hours 023 hrs (134%) [6.8%] 10, 2019 0, 2009
Cloud Cover am: Hazy
pm: Mostly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 14th 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

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Webcam Summary of Cloud Conditions

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Wind rose