Daily Report for 6th January 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.3 °C (-1.8) 23:58 2.0 °C (-1.2) 8.9 °C (+5.8), 2014 -4.6 °C (-7.7), 2009
Maximum Temperature 6.8 °C (-1.0) 00:01 5.3 °C (-2.5) 12.3 °C (+4.5), 2023 0.3 °C (-7.5), 2010
Mean Temperature 4.0 °C (-1.4) 3.8 °C (-1.8) 10.9 °C, 2014 -2.1 °C, 2009
Minimum Humidity 94% 05:30 77% 94%, 2011 42%, 2009
Maximum Humidity 98% 21:50 92% 98%, 2010 62%, 2009
Mean Humidity 95% 85% 97%, 2013 52%, 2009
Minimum Pressure 993 hPa 07:31 1011 hPa 1036 hPa, 2019 972 hPa, 2025
Maximum Pressure 1003 hPa 23:31 1019 hPa 1038 hPa, 2019 995 hPa, 2025
Mean Pressure 998 hPa 1015 hPa 1037 hPa, 2019 984 hPa, 2025
Mean Wind Speed 2.1 mph (-3.1) 4.0 mph (-1.2) 11.0 mph, 2014 1.4 mph, 2016
Maximum Wind Speed 7.4 mph 10.8 mph 23.3 mph, 2025 7.3 mph, 2019
Maximum Gust 10.5 mph 13:20 14.6 mph 38.0 mph, 2025 10.4 mph, 2016
Mean Wind Direction NW
Rainfall / Snow-melt approx. 10.1 mm 11.0 mm (96%) 16.8 mm, 2014
Maximum Hourly Rain 3.3 mm 14:25 3.9 mm, 2014
Maximum 10-min Rain 0.8 mm 14:00 3.1 mm, 2014
Maximum Rain Rate 4.0 mm/h 14:25 60 mm/h, 2014
Minimum Dew Point 0.9 °C 23:58 -0.7 °C 6.4 °C, 2013 -5.9 °C, 2010
Maximum Dew Point 6.1 °C 00:01 3.6 °C 11.9 °C, 2014 0.0 °C, 2010
Mean Dew Point 3.3 °C 1.5 °C 8.1 °C, 2014 -3.4 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.3 °C * 08:10 2.5 °C 9.2 °C, 2014 -4.6 °C, 2009
Day Maximum (09-21) * 4.7 °C * 00:00 4.8 °C 12.2 °C, 2014 0.3 °C, 2010
Max 10m Temp Rise 0.2 °C 18:15 0.2 °C 1.7 °C, 2018 0.1 °C, 2010
Max 1hr Temp Rise 0.4 °C 09:28 0.8 °C 2.8 °C, 2017 0.2 °C, 2010
Max 1hr Hum Rise 2% 09:16 4% 15%, 2014 1%, 2016
Max 10m Temp Fall 0.3 °C 23:26 0.2 °C 2.1 °C, 2025 0.1 °C, 2013
Max 1hr Temp Fall 1.0 °C 14:33 0.9 °C 6.1 °C, 2025 0.4 °C, 2013
Max 1hr Hum Fall 2% 13:59 4% 14%, 2015 1%, 2016
Max 10m Wind Speed 6.4 mph 11:37 7.4 mph 17.2 mph, 2025 4.8 mph, 2019
Minimum Feels-like -0.5 °C 14:44 -0.9 °C 4.7 °C, 2014 -10.1 °C, 2010
Maximum Feels-like 6.7 °C 00:03 5.2 °C 14.4 °C, 2014 0.3 °C, 2010
Mean Feels-like 3.4 °C 2.3 °C 11.0 °C, 2014 -1.3 °C, 2010
Air-frost Hrs 0 hrs 0.3 hrs 10 hrs, 2022 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.5 °C (+0.8) 3.4 °C (-1.3) 9.5 °C (+4.8), 2025 1.7 °C (-3.0), 2013
Humidity Range 4% 15% 31%, 2014 3%, 2016
Pressure Range 10 hPa 8 hPa 23 hPa, 2025 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]4.6 hrs (36%) [11%] 8 [111%], 2009 0 [0%], 2010
Wet Hours 7
[Mean rain rate: 1.4 mm/h]		9.4 hrs (72%) [6.5%] 14, 2010 , 2009
Cloud Cover Overcast
Events Snowfall: trace amount
Comments 08-1530 Light Rain (1330-1430 Moderate; 14-15 Light Sleet)
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 6th 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

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Wind rose