Daily Report for 12th November 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.9 °C (-1.9) 23:55 4.7 °C (-1.6) 11.2 °C (+5.3), 2015 3.0 °C (-2.8), 2023
Maximum Temperature 7.7 °C (-3.0) 07:18 11.3 °C (-0.2) 15.6 °C (+4.9), 2022 7.7 °C (-3.0), 2017
Mean Temperature 6.4 °C (-2.5) 8.4 °C (-0.9) 13.5 °C, 2015 5.8 °C, 2019
Minimum Humidity 63% 13:41 71% 89%, 2023 63%, 2017
Maximum Humidity 94% 03:44 95% 98%, 2009 82%, 2016
Mean Humidity 79% 85% 95%, 2023 78%, 2016
Minimum Pressure 1008 hPa 06:16 1013 hPa 1035 hPa, 2024 987 hPa, 2010
Maximum Pressure 1021 hPa 23:30 1021 hPa 1037 hPa, 2024 995 hPa, 2010
Mean Pressure 1012 hPa 1017 hPa 1036 hPa, 2024 991 hPa, 2010
Mean Wind Speed 5.7 mph (+1.1) 3.6 mph (-1.0) 7.9 mph, 2010 2.4 mph, 2023
Maximum Wind Speed 15.8 mph 12:52 10.5 mph 20.4 mph, 2010 7.4 mph, 2022
Maximum Gust 26.5 mph 20:05 16.8 mph 33.7 mph, 2010 11.5 mph, 2022
Mean Wind Direction NW
Rainfall 2.9 mm 25.9 mm (97%) 10.5 mm, 2016
Maximum Hourly Rain 1.1 mm 06:20 4.6 mm, 2009
Maximum 10-min Rain 0.7 mm 05:55 2.8 mm, 2014
Maximum Rain Rate 7 mm/h 05:51 54 mm/h, 2014
Minimum Dew Point -0.2 °C 23:47 2.6 °C 10.0 °C, 2011 -0.2 °C, 2017
Maximum Dew Point 6.8 °C 01:44 8.6 °C 13.9 °C, 2011 5.6 °C, 2019
Mean Dew Point 3.0 °C 6.0 °C 12.4 °C, 2011 3.0 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.6 °C * 07:43 5.7 °C 11.3 °C, 2011 2.8 °C, 2023
Day Maximum (09-21) 7.7 °C 12:42 11.3 °C 15.6 °C, 2022 7.7 °C, 2017
Max 10m Temp Rise 0.3 °C 12:12 0.4 °C 0.7 °C, 2011 0.2 °C, 2010
Max 1hr Temp Rise 0.9 °C 12:26 1.4 °C 2.2 °C, 2018 0.6 °C, 2011
Max 1hr Hum Rise 4% 15:40 6% 14%, 2019 2%, 2011
Max 10m Temp Fall 0.3 °C 12:39 0.4 °C 0.7 °C, 2013 0.1 °C, 2023
Max 1hr Temp Fall 0.8 °C 23:51 1.4 °C 2.4 °C, 2013 0.2 °C, 2023
Max 1hr Hum Fall 10% 12:16 9% 10%, 2017 1%, 2016
Max 10m Wind Speed 10.6 mph 13:09 7.9 mph 13.5 mph, 2019 5.8 mph, 2022
Minimum Feels-like -0.8 °C 23:58 2.0 °C 12.3 °C, 2015 -1.4 °C, 2019
Maximum Feels-like 7.7 °C 01:58 11.8 °C 31.9 °C, 2009 6.9 °C, 2019
Mean Feels-like 3.6 °C 7.6 °C 15.8 °C, 2011 2.4 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.8 °C (-1.0) 6.6 °C (+1.5) 8.2 °C (+3.4), 2013 1.7 °C (-3.1), 2010
Humidity Range 31% 24% 31%, 2017 8%, 2016
Pressure Range 13 hPa 8 hPa 13 hPa, 2017 3 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4.5 [56%]33 hrs (95%) [34%] 6 [74%], 2024 0 [0%], 2012
Wet Hours 4
[Mean rain rate: 0.7 mm/h]		29 hrs (113%) [9.9%] 12, 2016 0, 2011
Cloud Cover Partly Cloudy with periods of Mostly Sunny
Events None
Comments o.night Rain
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 12th November 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose