Daily Report for 14th September 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.0 °C (-3.7) 06:48 10.9 °C (-1.3) 19.0 °C (+7.3), 2016 5.4 °C (-6.3), 2024
Maximum Temperature 16.8 °C (-2.4) 14:28 19.0 °C (-1.2) 27.3 °C (+8.1), 2020 13.6 °C (-5.6), 2013
Mean Temperature 11.8 °C (-3.1) 14.9 °C (-1.3) 23.1 °C, 2016 11.1 °C, 2013
Minimum Humidity 55% 14:48 58% 86%, 2021 36%, 2019
Maximum Humidity 89% 05:52 91% 98%, 2013 80%, 2016
Mean Humidity 77% 77% 93%, 2021 64%, 2011
Minimum Pressure 1001 hPa 01:46 1004 hPa 1030 hPa, 2024 991 hPa, 2015
Maximum Pressure 1014 hPa 23:00 1012 hPa 1037 hPa, 2019 1000 hPa, 2015
Mean Pressure 1007 hPa 1008 hPa 1033 hPa, 2019 994 hPa, 2015
Mean Wind Speed 5.7 mph (+1.8) 5.4 mph (+1.5) 7.7 mph, 2010 1.2 mph, 2021
Maximum Wind Speed 14.7 mph 14:20 14.8 mph 19.4 mph, 2015 6.6 mph, 2022
Maximum Gust 21.9 mph 14:21 23.0 mph 25.9 mph, 2015 10.3 mph, 2019
Mean Wind Direction WNW
Rainfall 0.7 mm 29.9 mm (128%) 17.5 mm, 2021
Maximum Hourly Rain 0.7 mm 18:26 6.7 mm, 2021
Maximum 10-min Rain 0.4 mm 18:11 1.9 mm, 2021
Maximum Rain Rate 7 mm/h 18:11 30 mm/h, 2015
Minimum Dew Point 6.3 °C 07:07 8.2 °C 13.0 °C, 2021 4.0 °C, 2024
Maximum Dew Point 9.8 °C 18:14 13.3 °C 17.5 °C, 2021 9.8 °C, 2011
Mean Dew Point 7.8 °C 10.5 °C 16.0 °C, 2016 7.3 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.0 °C 06:48 11.2 °C 19.0 °C, 2016 5.4 °C, 2024
Day Maximum (09-21) 16.8 °C 14:28 19.0 °C 27.3 °C, 2020 13.6 °C, 2013
Max 10m Temp Rise 0.5 °C 12:38 0.6 °C 0.9 °C, 2022 0.2 °C, 2010
Max 1hr Temp Rise 1.8 °C 10:50 2.1 °C 4.2 °C, 2024 0.6 °C, 2021
Max 1hr Hum Rise 13% 19:05 12% 15%, 2016 2%, 2021
Max 10m Temp Fall 0.7 °C 15:53 0.7 °C 1.0 °C, 2016 0.3 °C, 2018
Max 1hr Temp Fall 2.4 °C 18:59 1.9 °C 3.8 °C, 2019 0.9 °C, 2018
Max 1hr Hum Fall 8% 12:46 10% 19%, 2012 2%, 2010
Max 10m Wind Speed 11.0 mph 10:16 11.0 mph 14.0 mph, 2015 4.4 mph, 2022
Minimum Feels-like 4.8 °C 06:58 11.2 °C 24.1 °C, 2016 4.8 °C, 2017
Maximum Feels-like 17.5 °C 14:27 21.2 °C 33.1 °C, 2016 16.1 °C, 2013
Mean Feels-like 11.5 °C 16.4 °C 27.7 °C, 2016 11.5 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.8 °C (+1.3) 8.1 °C (+0.1) 16.6 °C (+9.1), 2020 3.5 °C (-4.0), 2021
Humidity Range 34% 33% 58%, 2019 10%, 2021
Pressure Range 13 hPa 9 hPa 13 hPa, 2017 3 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.4 [29%]63 hrs (87%) [38%] 11.5 [99%], 2020 0 [0%], 2010
Wet Hours 0.5
[Mean rain rate: 1.4 mm/h]
29 hrs (152%) [8.6%] 9, 2021 0, 2009
Cloud Cover Mostly Cloudy
Events None
Comments eve Showers
Extra Comments 1830 Rainbow
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 September 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