Daily Report for 10th September 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.9 °C (-3.2) 05:37 11.2 °C (-1.2) 18.0 °C (+5.9), 2023 8.8 °C (-3.3), 2013
Maximum Temperature 16.7 °C (-3.3) 14:58 19.5 °C (-1.1) 30.4 °C (+10.4), 2023 16.5 °C (-3.5), 2013
Mean Temperature 13.1 °C (-3.2) 15.4 °C (-1.1) 23.4 °C, 2023 12.3 °C, 2013
Minimum Humidity 66% 14:59 59% 83%, 2016 37%, 2015
Maximum Humidity 96% 06:09 90% 96%, 2013 84%, 2012
Mean Humidity 85% 77% 93%, 2016 68%, 2020
Minimum Pressure 992 hPa 20:16 1008 hPa 1033 hPa, 2009 992 hPa, 2017
Maximum Pressure 1003 hPa 05:31 1015 hPa 1038 hPa, 2009 1003 hPa, 2017
Mean Pressure 999 hPa 1011 hPa 1036 hPa, 2009 999 hPa, 2017
Mean Wind Speed 6.7 mph (+2.8) 4.4 mph (+0.5) 9.2 mph, 2012 0.6 mph, 2020
Maximum Wind Speed 20.0 mph 15:56 13.0 mph 20.0 mph, 2017 5.6 mph, 2020
Maximum Gust 32.3 mph 15:28 19.8 mph 32.3 mph, 2017 10.4 mph, 2020
Mean Wind Direction SW
Rainfall 0.2 mm 16.5 mm (99%) 4.5 mm, 2021
Maximum Hourly Rain 0.2 mm 3.4 mm, 2021
Maximum 10-min Rain 0.2 mm 2.9 mm, 2021
Maximum Rain Rate n/a 30, 2021
Minimum Dew Point 8.1 °C 03:25 8.7 °C 16.5 °C, 2023 4.8 °C, 2015
Maximum Dew Point 13.7 °C 19:33 13.7 °C 22.2 °C, 2023 10.0 °C, 2020
Mean Dew Point 10.6 °C 11.0 °C 18.7 °C, 2023 8.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.9 °C 05:37 11.5 °C 18.0 °C, 2023 8.8 °C, 2013
Day Maximum (09-21) 16.7 °C 14:58 19.5 °C 30.4 °C, 2023 16.5 °C, 2013
Max 10m Temp Rise 0.6 °C 10:11 0.6 °C 1.0 °C, 2013 0.2 °C, 2016
Max 1hr Temp Rise 2.7 °C 08:58 2.1 °C 3.6 °C, 2019 0.6 °C, 2016
Max 1hr Hum Rise 12% 18:06 10% 12%, 2017 4%, 2010
Max 10m Temp Fall 0.4 °C 18:00 0.7 °C 1.0 °C, 2024 0.2 °C, 2010
Max 1hr Temp Fall 1.2 °C 01:11 1.7 °C 3.6 °C, 2024 0.7 °C, 2010
Max 1hr Hum Fall 10% 14:56 9% 19%, 2015 3%, 2016
Max 10m Wind Speed 14.5 mph 15:58 9.6 mph 14.5 mph, 2017 3.1 mph, 2020
Minimum Feels-like 6.9 °C 06:42 11.9 °C 22.9 °C, 2023 6.0 °C, 2013
Maximum Feels-like 19.0 °C 13:42 22.1 °C 39.8 °C, 2023 17.0 °C, 2013
Mean Feels-like 14.3 °C 17.3 °C 30.0 °C, 2023 12.5 °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 7.8 °C (-0.1) 8.3 °C (+0.1) 12.4 °C (+4.5), 2023 3.7 °C (-4.2), 2021
Humidity Range 30% 32% 55%, 2015 10%, 2016
Pressure Range 11 hPa 8 hPa 11 hPa, 2017 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [30%]40 hrs (78%) [34%] 11 [93%], 2015 0 [0%], 2016
Wet Hours 123 hrs (165%) [9.4%] 7, 2016 0, 2009
Cloud Cover am: Sunny transitioned to Hazy
pm: Overcast
Events None
Comments eve Rain
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 10th 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

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Webcam Summary of Cloud Conditions

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Wind rose