Daily Report for 12th December 2014

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.0 °C (-0.7) 23:56 3.3 °C (-0.6) 10.5 °C (+6.8), 2021 -4.7 °C (-8.4), 2012
Maximum Temperature 10.1 °C (+1.8) 05:43 8.3 °C (-0.4) 13.2 °C (+4.9), 2015 0.8 °C (-7.5), 2022
Mean Temperature 7.1 °C (+0.6) 5.6 °C (-0.5) 11.7 °C, 2021 -1.1 °C, 2012
Minimum Humidity 73% 00:20 69% 97%, 2013 63%, 2018
Maximum Humidity 93% 05:01 92% 98%, 2009 88%, 2015
Mean Humidity 83% 83% 98%, 2013 79%, 2018
Minimum Pressure 990 hPa 06:34 1012 hPa 1029 hPa, 2009 972 hPa, 2019
Maximum Pressure 1005 hPa 23:24 1021 hPa 1033 hPa, 2009 1004 hPa, 2019
Mean Pressure 996 hPa 1016 hPa 1031 hPa, 2009 989 hPa, 2019
Mean Wind Speed 7.1 mph (+2.0) 5.9 mph (+0.8) 7.8 mph, 2015 1.1 mph, 2012
Maximum Wind Speed 17.8 mph 05:13 14.8 mph 22.5 mph, 2011 6.8 mph, 2016
Maximum Gust 27.9 mph 06:02 21.5 mph 40.9 mph, 2011 9.7 mph, 2012
Mean Wind Direction WSW
Rainfall 10.7 mm 16.3 mm (74%) 11.0 mm, 2023
Maximum Hourly Rain 3.0 mm 05:46 3.0 mm, 2014
Maximum 10-min Rain 1.1 mm 05:05 1.1 mm, 2014
Maximum Rain Rate 18 mm/h 03:35 18 mm/h, 2014
Minimum Dew Point -0.4 °C 23:42 0.1 °C 8.8 °C, 2021 -5.1 °C, 2012
Maximum Dew Point 9.0 °C 05:38 6.3 °C 11.3 °C, 2021 0.1 °C, 2022
Mean Dew Point 4.3 °C 2.8 °C 10.2 °C, 2021 -2.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.5 °C * 02:40 4.0 °C 9.7 °C, 2021 -4.7 °C, 2012
Day Maximum (09-21) * 8.6 °C * 10:27 7.3 °C 13.2 °C, 2015 0.8 °C, 2022
Max 10m Temp Rise 0.2 °C 04:21 0.3 °C 0.6 °C, 2013 0.2 °C, 2014
Max 1hr Temp Rise 0.7 °C 04:21 1.1 °C 2.2 °C, 2013 0.4 °C, 2018
Max 1hr Hum Rise 9% 01:42 7% 9%, 2014 0%, 2013
Max 10m Temp Fall 0.5 °C 13:32 0.4 °C 0.5 °C, 2014 0.1 °C, 2015
Max 1hr Temp Fall 1.4 °C 14:22 1.0 °C 1.5 °C, 2010 0.2 °C, 2015
Max 1hr Hum Fall 9% 13:33 11% 9%, 2014 1%, 2013
Max 10m Wind Speed 14.6 mph 04:26 11.2 mph 15.4 mph, 2011 5.5 mph, 2012
Minimum Feels-like -0.7 °C 22:15 -0.7 °C 11.6 °C, 2021 -7.9 °C, 2017
Maximum Feels-like 10.9 °C 05:32 7.8 °C 14.8 °C, 2021 0.7 °C, 2022
Mean Feels-like 4.5 °C 3.2 °C 13.1 °C, 2021 -2.2 °C, 2017
Air-frost Hrs 0 hrs 0.2 hrs 15 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.1 °C (+2.5) 5.0 °C (+0.2) 8.6 °C (+4.0), 2013 1.8 °C (-2.8), 2022
Humidity Range 20% 23% 28%, 2018 1%, 2013
Pressure Range 15 hPa 9 hPa 32 hPa, 2019 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]27 hrs (107%) [32%] 6.3 [89%], 2017 0 [0%], 2014
Wet Hours 7
[Mean rain rate: 1.5 mm/h]		23 hrs (94%) [7.8%] 11, 2023 0, 2009
Cloud Cover Overcast or Mostly Cloudy
Events None
Comments o.night Rain, 0930 Shower
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 12th December 2014.
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

daycamsumLarge resolution version

Wind rose