Daily Report for 27th December 2011

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.2 °C (+4.8) 23:43 3.9 °C (+0.3) 12.4 °C (+9.0), 2015 0.2 °C (-3.2), 2016
Maximum Temperature 10.4 °C (+2.6) 11:29 8.8 °C (+0.6) 14.5 °C (+6.7), 2015 4.1 °C (-3.7), 2010
Mean Temperature 9.8 °C (+3.7) 6.6 °C (+0.5) 14.0 °C, 2015 2.3 °C, 2016
Minimum Humidity 68% 17:22 70% 92%, 2021 66%, 2010
Maximum Humidity 81% 23:59 90% 98%, 2013 80%, 2010
Mean Humidity 71% 81% 94%, 2021 71%, 2011
Minimum Pressure 1027 hPa 23:47 1006 hPa 1041 hPa, 2016 973 hPa, 2020
Maximum Pressure 1035 hPa 09:48 1015 hPa 1046 hPa, 2016 991 hPa, 2013
Mean Pressure 1031 hPa 1011 hPa 1044 hPa, 2016 978 hPa, 2020
Mean Wind Speed 5.7 mph (+0.6) 6.1 mph (+1.0) 10.5 mph, 2013 0.3 mph, 2018
Maximum Wind Speed 12.5 mph 15.4 mph 27.8 mph, 2020 4.1 mph, 2018
Maximum Gust 17.5 mph 00:24 22.7 mph 41.1 mph, 2020 5.8 mph, 2018
Mean Wind Direction SW
Rainfall 0.0 mm 47.8 mm (96%) 11.4 mm, 2020
Maximum Hourly Rain n/a 2.7, 2013
Maximum 10-min Rain n/a 1.3, 2013
Maximum Rain Rate n/a 18, 2013
Minimum Dew Point 3.9 °C 20:22 0.8 °C 9.6 °C, 2015 -3.1 °C, 2016
Maximum Dew Point 5.4 °C 10:08 6.3 °C 12.6 °C, 2015 0.7 °C, 2010
Mean Dew Point 4.9 °C 3.5 °C 11.4 °C, 2015 -1.5 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.9 °C * 08:00 4.7 °C 13.4 °C, 2015 -0.4 °C, 2010
Day Maximum (09-21) 10.4 °C 11:29 8.5 °C 14.5 °C, 2015 2.9 °C, 2017
Max 10m Temp Rise 0.1 °C 10:31 0.3 °C 0.5 °C, 2022 0.1 °C, 2011
Max 1hr Temp Rise 0.3 °C 10:31 1.0 °C 1.8 °C, 2022 0.3 °C, 2011
Max 1hr Hum Rise 4% 21:26 5% 10%, 2013 1%, 2021
Max 10m Temp Fall 0.2 °C 13:10 0.3 °C 1.2 °C, 2014 0.2 °C, 2010
Max 1hr Temp Fall 0.7 °C 20:06 1.0 °C 4.9 °C, 2014 0.5 °C, 2021
Max 1hr Hum Fall 2% 01:01 5% 13%, 2013 1%, 2015
Max 10m Wind Speed 9.2 mph 00:42 8.9 mph 22.5 mph, 2020 3.3 mph, 2018
Minimum Feels-like 5.1 °C 22:20 0.3 °C 13.9 °C, 2015 -6.3 °C, 2017
Maximum Feels-like 10.4 °C 11:25 8.1 °C 17.0 °C, 2015 4.0 °C, 2010
Mean Feels-like 9.2 °C 4.6 °C 16.0 °C, 2015 -1.4 °C, 2017
Air-frost Hrs 0 hrs 0.2 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 2.2 °C (-2.2) 4.9 °C (+0.3) 9.2 °C (+4.8), 2020 1.6 °C (-2.8), 2010
Humidity Range 13% 20% 32%, 2013 4%, 2021
Pressure Range 8 hPa 10 hPa 23 hPa, 2012 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]65 hrs (115%) [34%] 5 [71%], 2016 0 [0%], 2010
Wet Hours 052 hrs (97%) [8.1%] 8, 2017 0, 2009
Cloud Cover Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th December 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