Daily Report for 3rd December 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.9 °C (+0.9) 23:57 7.8 °C (+3.8) 11.9 °C (+7.9), 2015 -4.7 °C (-8.7), 2010
Maximum Temperature 13.6 °C (+4.4) 12:22 13.7 °C (+4.5) 13.6 °C (+4.4), 2018 1.5 °C (-7.7), 2010
Mean Temperature 10.6 °C (+2.7) 11.5 °C (+4.1) 12.6 °C, 2015 -2.7 °C, 2010
Minimum Humidity 76% 18:13 80% 93%, 2023 54%, 2016
Maximum Humidity 89% 11:41 93% 98%, 2009 80%, 2016
Mean Humidity 84% 88% 95%, 2023 70%, 2016
Minimum Pressure 997 hPa 12:09 997 hPa 1027 hPa, 2013 976 hPa, 2020
Maximum Pressure 1013 hPa 23:46 1008 hPa 1032 hPa, 2019 1002 hPa, 2009
Mean Pressure 1002 hPa 1001 hPa 1029 hPa, 2013 990 hPa, 2020
Mean Wind Speed 6.4 mph (+1.3) 6.7 mph (+1.6) 8.9 mph, 2015 1.9 mph, 2024
Maximum Wind Speed 16.4 mph 10:57 15.8 mph 19.4 mph, 2015 7.1 mph, 2017
Maximum Gust 27.6 mph 14:04 27.2 mph 27.9 mph, 2015 10.4 mph, 2017
Mean Wind Direction W
Rainfall 0.9 mm 8.6 mm (156%) 15.4 mm, 2020
Maximum Hourly Rain 0.4 mm 15:31 3.1 mm, 2020
Maximum 10-min Rain 0.4 mm 15:31 2.0 mm, 2015
Maximum Rain Rate 4.4 mm/h 15:31 54 mm/h, 2015
Minimum Dew Point 2.8 °C 23:57 5.9 °C 7.7 °C, 2015 -6.2 °C, 2010
Maximum Dew Point 11.2 °C 11:43 11.7 °C 11.3 °C, 2015 -0.6 °C, 2010
Mean Dew Point 8.1 °C 9.5 °C 9.4 °C, 2015 -4.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.2 °C * 06:28 9.8 °C 12.7 °C, 2015 -4.7 °C, 2010
Day Maximum (09-21) 13.6 °C 12:23 13.7 °C 13.6 °C, 2018 -1.9 °C, 2010
Max 10m Temp Rise 0.3 °C 10:08 0.3 °C 0.9 °C, 2023 0.1 °C, 2013
Max 1hr Temp Rise 0.8 °C 10:14 0.9 °C 2.4 °C, 2023 0.3 °C, 2009
Max 1hr Hum Rise 6% 11:28 6% 14%, 2014 1%, 2013
Max 10m Temp Fall 0.7 °C 15:41 0.4 °C 0.7 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 2.2 °C 16:30 1.1 °C 2.2 °C, 2018 0.4 °C, 2023
Max 1hr Hum Fall 7% 17:56 5% 19%, 2012 3%, 2010
Max 10m Wind Speed 12.1 mph 14:09 11.6 mph 15.9 mph, 2015 5.0 mph, 2017
Minimum Feels-like 3.2 °C 22:47 6.5 °C 12.6 °C, 2015 -9.7 °C, 2010
Maximum Feels-like 15.3 °C 12:22 15.7 °C 15.3 °C, 2018 0.1 °C, 2010
Mean Feels-like 10.9 °C 12.3 °C 13.6 °C, 2015 -5.7 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 22 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.7 °C (+3.6) 5.9 °C (+0.8) 10.2 °C (+5.1), 2023 1.2 °C (-3.9), 2015
Humidity Range 13% 13% 38%, 2011 5%, 2023
Pressure Range 16 hPa 11 hPa 34 hPa, 2020 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.1 [15%]1.5 hrs (23%) [6.9%] 5.5 [76%], 2019 0 [0%], 2009
Wet Hours 1
[Mean rain rate: 0.9 mm/h]		9 hrs (150%) [13%] 12, 2020 0, 2010
Cloud Cover Mostly Cloudy with periods of Partly Cloudy
Events None
Comments days Showers
Extra Comments 14 rainbow
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 3rd 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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