Daily Report for 27th August 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 15.5 °C (+2.1) 02:21 13.7 °C (-0.4) 16.1 °C (+2.7), 2019 10.5 °C (-2.9), 2014
Maximum Temperature 25.8 °C (+4.1) 16:14 21.8 °C (-0.8) 31.7 °C (+10.0), 2019 17.3 °C (-4.4), 2010
Mean Temperature 20.2 °C (+3.1) 17.6 °C (-0.6) 24.1 °C, 2019 14.0 °C, 2010
Minimum Humidity 43% 17:16 50% 70%, 2020 39%, 2019
Maximum Humidity 73% 03:01 82% 98%, 2010 73%, 2017
Mean Humidity 58% 67% 85%, 2010 58%, 2017
Minimum Pressure 1018 hPa 10:28 1014 hPa 1023 hPa, 2021 1002 hPa, 2020
Maximum Pressure 1021 hPa 09:19 1019 hPa 1026 hPa, 2021 1011 hPa, 2015
Mean Pressure 1019 hPa 1017 hPa 1024 hPa, 2021 1007 hPa, 2015
Mean Wind Speed 1.4 mph (-2.6) 3.7 mph (-0.3) 5.8 mph, 2009 1.4 mph, 2017
Maximum Wind Speed 6.1 mph 08:33 11.1 mph 16.5 mph, 2016 6.1 mph, 2017
Maximum Gust 9.4 mph 14:41 17.0 mph 25.8 mph, 2016 9.4 mph, 2017
Mean Wind Direction NNE
Rainfall 0.0 mm 77.2 mm (164%) 4.8 mm, 2020
Maximum Hourly Rain n/a 1.9, 2020
Maximum 10-min Rain n/a 1.8, 2015
Maximum Rain Rate n/a 42, 2015
Minimum Dew Point 9.4 °C 21:14 8.3 °C 14.0 °C, 2019 6.4 °C, 2013
Maximum Dew Point 13.3 °C 13:34 13.4 °C 18.7 °C, 2019 12.8 °C, 2011
Mean Dew Point 11.5 °C 10.9 °C 16.3 °C, 2019 10.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 15.5 °C 02:21 13.8 °C 16.1 °C, 2019 10.5 °C, 2014
Day Maximum (09-21) 25.8 °C 16:14 21.8 °C 31.7 °C, 2019 17.3 °C, 2010
Max 10m Temp Rise 0.5 °C 09:22 0.6 °C 0.9 °C, 2022 0.4 °C, 2015
Max 1hr Temp Rise 2.5 °C 10:08 2.1 °C 3.6 °C, 2019 1.6 °C, 2010
Max 1hr Hum Rise 10% 22:10 8% 16%, 2019 4%, 2018
Max 10m Temp Fall 0.7 °C 19:48 0.6 °C 0.7 °C, 2013 0.2 °C, 2014
Max 1hr Temp Fall 3.5 °C 20:18 1.9 °C 3.5 °C, 2017 0.8 °C, 2014
Max 1hr Hum Fall 6% 10:01 9% 18%, 2014 6%, 2017
Max 10m Wind Speed 4.2 mph 06:59 8.2 mph 12.8 mph, 2016 4.2 mph, 2017
Minimum Feels-like 16.9 °C 02:07 14.8 °C 19.5 °C, 2019 11.5 °C, 2014
Maximum Feels-like 28.4 °C 16:07 24.0 °C 37.9 °C, 2019 19.1 °C, 2010
Mean Feels-like 22.2 °C 19.4 °C 29.0 °C, 2019 15.8 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.3 °C (+2.0) 8.1 °C (-0.3) 15.6 °C (+7.2), 2019 4.7 °C (-3.6), 2020
Humidity Range 30% 31% 52%, 2013 24%, 2020
Pressure Range 3 hPa 5 hPa 17 hPa, 2020 3 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [79%]153 hrs (94%) [42%] 11.5 [91%], 2019 1 [8%], 2010
Wet Hours 040 hrs (119%) [6.1%] 7, 2010 0, 2009
Cloud Cover am: Partly Cloudy transitioned to Sunny
pm: Sunny
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 27th 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