Daily Report for 5th December 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.9 °C (+2.0) 01:31 6.3 °C (+2.3) 11.4 °C (+7.5), 2015 -1.3 °C (-5.2), 2010
Maximum Temperature 12.4 °C (+3.5) 13:50 12.2 °C (+3.2) 13.7 °C (+4.8), 2024 3.0 °C (-5.9), 2012
Mean Temperature 9.8 °C (+2.7) 9.9 °C (+2.7) 12.1 °C, 2015 1.3 °C, 2012
Minimum Humidity 89% 14:25 82% 91%, 2023 52%, 2013
Maximum Humidity 98% 10:25 94% 98%, 2009 73%, 2015
Mean Humidity 94% 89% 94%, 2023 68%, 2015
Minimum Pressure 1010 hPa 19:11 1002 hPa 1033 hPa, 2017 985 hPa, 2020
Maximum Pressure 1022 hPa 00:02 1014 hPa 1036 hPa, 2017 1000 hPa, 2020
Mean Pressure 1014 hPa 1008 hPa 1035 hPa, 2017 993 hPa, 2020
Mean Wind Speed 4.5 mph (-0.6) 5.2 mph (+0.1) 13.5 mph, 2015 0.2 mph, 2016
Maximum Wind Speed 11.4 mph 15:03 13.3 mph 26.1 mph, 2015 4.2 mph, 2016
Maximum Gust 18.4 mph 14:37 22.6 mph 41.5 mph, 2024 6.3 mph, 2016
Mean Wind Direction S
Rainfall 5.3 mm 15.2 mm (165%) 13.4 mm, 2024
Maximum Hourly Rain 1.8 mm 01:25 4.6 mm, 2024
Maximum 10-min Rain 0.4 mm 00:38 2.7 mm, 2024
Maximum Rain Rate 3.3 mm/h 01:01 42 mm/h, 2024
Minimum Dew Point 4.5 °C 01:09 4.7 °C 6.3 °C, 2009 -4.0 °C, 2012
Maximum Dew Point 11.5 °C 21:31 10.3 °C 12.7 °C, 2024 1.5 °C, 2012
Mean Dew Point 8.8 °C 8.2 °C 10.3 °C, 2024 -1.3 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.9 °C 01:31 7.5 °C 11.4 °C, 2015 -0.9 °C, 2012
Day Maximum (09-21) 12.4 °C 13:52 12.2 °C 13.7 °C, 2024 3.0 °C, 2012
Max 10m Temp Rise 0.9 °C 09:47 0.4 °C 0.9 °C, 2018 0.1 °C, 2015
Max 1hr Temp Rise 2.6 °C 10:14 1.3 °C 2.6 °C, 2018 0.4 °C, 2015
Max 1hr Hum Rise 2% 01:17 5% 6%, 2011 2%, 2016
Max 10m Temp Fall 0.2 °C 01:03 0.4 °C 1.3 °C, 2013 0.1 °C, 2015
Max 1hr Temp Fall 0.3 °C 15:03 1.0 °C 2.3 °C, 2013 0.2 °C, 2015
Max 1hr Hum Fall 4% 13:00 5% 19%, 2013 2%, 2023
Max 10m Wind Speed 8.7 mph 14:38 10.0 mph 20.3 mph, 2015 2.2 mph, 2016
Minimum Feels-like 2.0 °C 03:48 4.1 °C 11.4 °C, 2015 -4.4 °C, 2012
Maximum Feels-like 14.3 °C 21:13 13.7 °C 16.2 °C, 2024 1.4 °C, 2012
Mean Feels-like 10.2 °C 10.3 °C 12.5 °C, 2024 -1.3 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.5 °C (+1.5) 5.9 °C (+0.9) 9.8 °C (+4.8), 2019 1.3 °C (-3.7), 2015
Humidity Range 9% 13% 38%, 2013 5%, 2023
Pressure Range 13 hPa 12 hPa 19 hPa, 2024 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]5.5 hrs (51%) [15%] 5 [69%], 2016 0 [0%], 2015
Wet Hours 8
[Mean rain rate: 0.7 mm/h]		20 hrs (200%) [17%] 9, 2024 0, 2010
Cloud Cover Overcast with periods of Mostly Cloudy
Events None
Comments Rain spells
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 5th December 2018.
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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