Daily Report for 13th December 2013

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.8 °C (+4.2) 23:56 3.5 °C (-0.3) 9.7 °C (+6.1), 2021 -2.6 °C (-6.2), 2022
Maximum Temperature 11.7 °C (+3.5) 13:54 8.9 °C (+0.2) 13.5 °C (+5.3), 2016 1.1 °C (-7.1), 2012
Mean Temperature 10.3 °C (+3.8) 6.4 °C (-0.0) 11.3 °C, 2016 -0.9 °C, 2022
Minimum Humidity 77% 14:26 75% 89%, 2020 57%, 2011
Maximum Humidity 97% 00:12 92% 98%, 2010 82%, 2016
Mean Humidity 90% 85% 93%, 2010 75%, 2011
Minimum Pressure 1016 hPa 15:52 1025 hPa 1025 hPa, 2009 971 hPa, 2019
Maximum Pressure 1023 hPa 00:30 1030 hPa 1029 hPa, 2009 985 hPa, 2019
Mean Pressure 1019 hPa 1027 hPa 1027 hPa, 2009 980 hPa, 2019
Mean Wind Speed 4.8 mph (-0.3) 3.6 mph (-1.5) 9.6 mph, 2011 2.5 mph, 2012
Maximum Wind Speed 13.5 mph 14:57 10.4 mph 20.8 mph, 2011 6.6 mph, 2022
Maximum Gust 16.1 mph 15:23 14.1 mph 33.4 mph, 2017 10.0 mph, 2012
Mean Wind Direction SW
Rainfall 2.7 mm 4.5 mm (19%) 10.1 mm, 2017
Maximum Hourly Rain 1.5 mm 18:24 4.9 mm, 2011
Maximum 10-min Rain 0.6 mm 17:55 3.0 mm, 2011
Maximum Rain Rate 3.6 mm/h 17:55 30 mm/h, 2011
Minimum Dew Point 6.3 °C 23:57 1.1 °C 7.7 °C, 2021 -3.7 °C, 2012
Maximum Dew Point 9.7 °C 09:56 6.5 °C 10.9 °C, 2011 -1.4 °C, 2022
Mean Dew Point 8.7 °C 3.9 °C 8.7 °C, 2013 -2.4 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.7 °C * 21:05 4.0 °C 10.4 °C, 2021 -2.6 °C, 2022
Day Maximum (09-21) 11.7 °C 13:54 8.8 °C 13.5 °C, 2016 0.8 °C, 2012
Max 10m Temp Rise 0.2 °C 00:11 0.4 °C 0.6 °C, 2009 0.2 °C, 2013
Max 1hr Temp Rise 0.6 °C 09:55 1.3 °C 2.1 °C, 2014 0.4 °C, 2021
Max 1hr Hum Rise 6% 16:13 4% 12%, 2011 2%, 2016
Max 10m Temp Fall 0.2 °C 22:10 0.4 °C 1.8 °C, 2015 0.2 °C, 2010
Max 1hr Temp Fall 0.8 °C 22:24 1.2 °C 4.5 °C, 2015 0.5 °C, 2021
Max 1hr Hum Fall 6% 12:28 6% 13%, 2014 1%, 2015
Max 10m Wind Speed 9.1 mph 15:05 7.6 mph 17.4 mph, 2011 4.9 mph, 2012
Minimum Feels-like 4.6 °C 23:47 0.8 °C 6.5 °C, 2021 -7.0 °C, 2022
Maximum Feels-like 12.3 °C 12:54 8.9 °C 14.9 °C, 2016 1.1 °C, 2012
Mean Feels-like 10.4 °C 5.2 °C 11.9 °C, 2016 -3.2 °C, 2022
Air-frost Hrs 0 hrs 0 hrs 20 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.9 °C (-0.6) 5.4 °C (+0.5) 9.0 °C (+4.5), 2020 1.8 °C (-2.7), 2021
Humidity Range 20% 17% 39%, 2011 2%, 2016
Pressure Range 7 hPa 5 hPa 22 hPa, 2023 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]16 hrs (57%) [17%] 7 [99%], 2018 0 [0%], 2013
Wet Hours 3
[Mean rain rate: 0.9 mm/h]		3.6 hrs (14%) [1.2%] 10, 2015 0, 2010
Cloud Cover Overcast
Events None
Comments 07-08 Slight, 17-20 Light Rain
Extra Comments 2 tips reassigned from previous foggy days to today
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th 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