Daily Report for 14th January 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+4.8) 23:56 3.1 °C (+0.0) 7.8 °C (+4.8), 2011 -2.9 °C (-5.9), 2012
Maximum Temperature 11.7 °C (+3.9) 03:18 7.9 °C (+0.1) 12.9 °C (+5.1), 2020 2.4 °C (-5.4), 2013
Mean Temperature 10.5 °C (+4.3) 5.8 °C (+0.0) 10.5 °C, 2011 0.7 °C, 2012
Minimum Humidity 85% 13:55 78% 98%, 2010 58%, 2015
Maximum Humidity 95% 00:00 94% 98%, 2010 81%, 2019
Mean Humidity 92% 87% 98%, 2010 74%, 2015
Minimum Pressure 1008 hPa 08:30 1006 hPa 1034 hPa, 2025 992 hPa, 2015
Maximum Pressure 1015 hPa 23:56 1016 hPa 1040 hPa, 2022 1000 hPa, 2020
Mean Pressure 1012 hPa 1011 hPa 1037 hPa, 2022 997 hPa, 2020
Mean Wind Speed 7.0 mph (+1.8) 5.1 mph (-0.1) 11.5 mph, 2020 0.1 mph, 2022
Maximum Wind Speed 17.0 mph 13.8 mph 27.9 mph, 2020 4.3 mph, 2022
Maximum Gust 23.7 mph 01:54 19.9 mph 42.6 mph, 2020 7.4 mph, 2012
Mean Wind Direction SW
Rainfall 5.5 mm 45.6 mm (171%) 25.2 mm, 2021
Maximum Hourly Rain 5.5 mm 15:53 5.5 mm, 2011
Maximum 10-min Rain 3.8 mm 15:35 3.8 mm, 2011
Maximum Rain Rate 40 mm/h 15:30 40 mm/h, 2011
Minimum Dew Point 6.7 °C 23:56 0.7 °C 6.7 °C, 2011 -4.8 °C, 2016
Maximum Dew Point 10.9 °C 00:16 6.4 °C 11.5 °C, 2020 0.5 °C, 2017
Mean Dew Point 9.3 °C 3.8 °C 9.3 °C, 2011 -1.7 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.3 °C * 09:00 4.1 °C 11.3 °C, 2011 -2.9 °C, 2012
Day Maximum (09-21) 11.7 °C 11:40 7.6 °C 12.9 °C, 2020 2.4 °C, 2013
Max 10m Temp Rise 0.1 °C 02:00 0.2 °C 0.5 °C, 2012 0.1 °C, 2011
Max 1hr Temp Rise 0.3 °C 11:03 0.9 °C 2.3 °C, 2022 0.2 °C, 2021
Max 1hr Hum Rise 7% 16:55 4% 14%, 2015 0%, 2010
Max 10m Temp Fall 0.7 °C 15:41 0.3 °C 1.5 °C, 2021 0.1 °C, 2025
Max 1hr Temp Fall 1.8 °C 16:09 1.0 °C 3.9 °C, 2021 0.3 °C, 2025
Max 1hr Hum Fall 6% 13:40 6% 13%, 2014 0%, 2010
Max 10m Wind Speed 12.0 mph 00:06 9.2 mph 20.9 mph, 2020 3.7 mph, 2022
Minimum Feels-like 5.3 °C 23:01 0.4 °C 5.3 °C, 2011 -6.2 °C, 2017
Maximum Feels-like 13.4 °C 00:00 8.2 °C 14.9 °C, 2020 1.6 °C, 2013
Mean Feels-like 10.9 °C 4.5 °C 10.9 °C, 2011 -1.4 °C, 2013
Air-frost Hrs 0 hrs 0.3 hrs 10 hrs, 2012 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-0.9) 4.8 °C (+0.1) 8.4 °C (+3.6), 2022 2.3 °C (-2.5), 2009
Humidity Range 10% 17% 31%, 2015 0%, 2010
Pressure Range 7 hPa 10 hPa 18 hPa, 2023 3 hPa, 2025
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]14 hrs (47%) [14%] 7.4 [100%], 2012 0 [0%], 2009
Wet Hours 1
[Mean rain rate: 6 mm/h]		39 hrs (129%) [12%] 14, 2021 , 2009
Cloud Cover Overcast
Events Light Thunderstorm
Comments 08, 10 Slight Showers; 15 Thunderstormtorm ; 1530 Very Heavy Shower
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 14th January 2011.
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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Wind rose