Daily Report for 8th December 2017

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.4 °C (-3.4) 23:55 4.4 °C (+0.4) 10.7 °C (+6.9), 2016 -2.4 °C (-6.2), 2022
Maximum Temperature 4.1 °C (-4.6) 00:08 8.3 °C (-0.6) 13.5 °C (+4.8), 2015 2.0 °C (-6.7), 2010
Mean Temperature 2.5 °C (-4.0) 6.4 °C (-0.1) 12.1 °C, 2016 -0.7 °C, 2022
Minimum Humidity 69% 14:01 75% 92%, 2020 62%, 2014
Maximum Humidity 83% 21:24 90% 98%, 2009 79%, 2016
Mean Humidity 77% 83% 94%, 2020 76%, 2014
Minimum Pressure 1012 hPa 03:31 1020 hPa 1024 hPa, 2013 985 hPa, 2021
Maximum Pressure 1019 hPa 21:45 1028 hPa 1030 hPa, 2015 999 hPa, 2021
Mean Pressure 1015 hPa 1024 hPa 1026 hPa, 2016 992 hPa, 2021
Mean Wind Speed 7.5 mph (+2.4) 5.5 mph (+0.4) 11.1 mph, 2019 1.5 mph, 2020
Maximum Wind Speed 15.8 mph 14:27 12.9 mph 22.5 mph, 2011 7.0 mph, 2020
Maximum Gust 28.8 mph 11:33 21.5 mph 36.5 mph, 2011 10.4 mph, 2022
Mean Wind Direction W
Rainfall 0.0 mm 3.9 mm (27%) 2.6 mm, 2015
Maximum Hourly Rain n/a 1.8, 2019
Maximum 10-min Rain n/a 0.8, 2015
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point -2.4 °C 17:36 1.6 °C 7.0 °C, 2016 -5.6 °C, 2010
Maximum Dew Point 0.7 °C 01:00 6.0 °C 11.8 °C, 2015 -0.1 °C, 2022
Mean Dew Point -1.1 °C 3.7 °C 8.4 °C, 2016 -2.4 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 2.5 °C * 08:12 5.1 °C 11.6 °C, 2015 -2.3 °C, 2022
Day Maximum (09-21) * 3.7 °C * 12:51 8.2 °C 13.5 °C, 2015 2.0 °C, 2010
Max 10m Temp Rise 0.3 °C 10:53 0.3 °C 1.0 °C, 2011 0.2 °C, 2009
Max 1hr Temp Rise 0.8 °C 11:08 0.9 °C 2.3 °C, 2013 0.6 °C, 2019
Max 1hr Hum Rise 5% 15:57 5% 8%, 2019 1%, 2016
Max 10m Temp Fall 0.2 °C 01:47 0.4 °C 0.5 °C, 2022 0.1 °C, 2009
Max 1hr Temp Fall 0.9 °C 16:41 1.1 °C 2.1 °C, 2022 0.5 °C, 2009
Max 1hr Hum Fall 5% 11:33 6% 13%, 2014 1%, 2016
Max 10m Wind Speed 12.5 mph 13:11 10.0 mph 16.6 mph, 2019 5.5 mph, 2020
Minimum Feels-like -5.7 °C 21:30 -0.0 °C 10.7 °C, 2016 -7.5 °C, 2010
Maximum Feels-like 1.7 °C 01:25 7.9 °C 15.6 °C, 2015 1.7 °C, 2017
Mean Feels-like -2.0 °C 4.1 °C 12.7 °C, 2016 -3.9 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 18 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.7 °C (-1.1) 3.9 °C (-1.1) 8.9 °C (+4.1), 2011 2.4 °C (-2.4), 2016
Humidity Range 14% 15% 27%, 2019 2%, 2016
Pressure Range 7 hPa 8 hPa 19 hPa, 2011 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [56%]11 hrs (61%) [18%] 6 [84%], 2022 0 [0%], 2011
Wet Hours 04.3 hrs (27%) [2.2%] 5, 2015 0, 2010
Cloud Cover am: Partly Cloudy
pm: Mostly Sunny transitioned to 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 8th December 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

daycamsumLarge resolution version

Wind rose