Daily Report for 11th December 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.3 °C (-3.4) 23:57 3.4 °C (-0.4) 7.9 °C (+4.2), 2025 -3.9 °C (-7.6), 2022
Maximum Temperature 4.2 °C (-4.2) 13:08 8.6 °C (-0.1) 11.8 °C (+3.4), 2025 -0.1 °C (-8.5), 2022
Mean Temperature 2.4 °C (-3.8) 6.1 °C (-0.3) 9.9 °C, 2025 -1.9 °C, 2022
Minimum Humidity 93% 00:02 73% 96%, 2009 65%, 2014
Maximum Humidity 98% 91% 98%, 2009 79%, 2016
Mean Humidity 98% 83% 98%, 2009 77%, 2014
Minimum Pressure 1027 hPa 23:48 1026 hPa 1032 hPa, 2024 978 hPa, 2017
Maximum Pressure 1031 hPa 05:15 1031 hPa 1034 hPa, 2009 993 hPa, 2020
Mean Pressure 1029 hPa 1028 hPa 1033 hPa, 2024 985 hPa, 2017
Mean Wind Speed 0.6 mph (-4.5) 3.6 mph (-1.5) 8.7 mph, 2014 0.6 mph, 2013
Maximum Wind Speed 4.0 mph 02:40 10.4 mph 18.7 mph, 2023 4.0 mph, 2013
Maximum Gust 5.9 mph 04:20 14.3 mph 32.3 mph, 2023 5.9 mph, 2013
Mean Wind Direction ENE
Rainfall 0.0 mm 1.8 mm (9%) 16.1 mm, 2017
Maximum Hourly Rain n/a 5.3, 2011
Maximum 10-min Rain n/a 2, 2011
Maximum Rain Rate n/a 24, 2015
Minimum Dew Point 0.0 °C 23:57 0.8 °C 6.5 °C, 2025 -4.6 °C, 2022
Maximum Dew Point 3.9 °C 13:08 6.0 °C 9.9 °C, 2021 -0.5 °C, 2022
Mean Dew Point 2.0 °C 3.3 °C 7.9 °C, 2020 -2.4 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 1.4 °C * 05:07 4.0 °C 9.5 °C, 2015 -3.9 °C, 2022
Day Maximum (09-21) 4.2 °C 13:08 8.6 °C 11.8 °C, 2025 -0.1 °C, 2022
Max 10m Temp Rise 0.4 °C 00:10 0.3 °C 0.6 °C, 2009 0.1 °C, 2015
Max 1hr Temp Rise 0.9 °C 11:34 1.3 °C 2.1 °C, 2018 0.4 °C, 2015
Max 1hr Hum Rise 3% 01:01 4% 9%, 2014 1%, 2009
Max 10m Temp Fall 0.4 °C 19:47 0.4 °C 0.6 °C, 2014 0.1 °C, 2021
Max 1hr Temp Fall 0.9 °C 15:39 1.3 °C 1.7 °C, 2012 0.4 °C, 2021
Max 1hr Hum Fall 0% 02:29 7% 12%, 2014 0%, 2013
Max 10m Wind Speed 3.0 mph 02:42 7.6 mph 14.9 mph, 2023 3.0 mph, 2013
Minimum Feels-like -1.4 °C 04:20 0.7 °C 5.6 °C, 2025 -6.8 °C, 2017
Maximum Feels-like 4.2 °C 13:00 8.6 °C 12.4 °C, 2025 -0.9 °C, 2017
Mean Feels-like 2.2 °C 4.7 °C 9.3 °C, 2025 -3.5 °C, 2017
Air-frost Hrs 0 hrs 0 hrs 24 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-0.7) 5.2 °C (+0.3) 8.5 °C (+3.9), 2021 1.4 °C (-3.2), 2024
Humidity Range 5% 18% 21%, 2014 2%, 2009
Pressure Range 4 hPa 5 hPa 20 hPa, 2017 2 hPa, 2024
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [21%]14 hrs (58%) [17%] 7 [99%], 2012 0 [0%], 2011
Wet Hours 00.6 hrs (3%) [0.2%] 13, 2017 0, 2009
Cloud Cover am: Overcast
pm: Sunny transitioned to Mostly Cloudy
Events Dense Fog
Comments V. Dense Fog much of period
Extra Comments Rain tip was fog-induced so has been postponed.. Visibility at times <50m.
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 11th December 2013.
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

day graph

Webcam Summary of Cloud Conditions

daycamsumLarge resolution version

Wind rose