Daily Report for 13th December 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.6 °C (-6.2) 03:54 0.4 °C (-3.4) 9.7 °C (+6.1), 2021 -2.6 °C (-6.2), 2022
Maximum Temperature 1.1 °C (-7.1) 12:53 4.4 °C (-4.3) 13.5 °C (+5.3), 2016 1.1 °C (-7.1), 2012
Mean Temperature -0.9 °C (-6.7) 2.2 °C (-3.8) 11.3 °C, 2016 -0.9 °C, 2022
Minimum Humidity 81% 11:59 84% 90%, 2024 57%, 2011
Maximum Humidity 93% 02:55 94% 98%, 2010 82%, 2016
Mean Humidity 89% 90% 94%, 2024 75%, 2011
Minimum Pressure 1005 hPa 22:18 1015 hPa 1025 hPa, 2009 971 hPa, 2019
Maximum Pressure 1011 hPa 00:09 1019 hPa 1029 hPa, 2024 985 hPa, 2019
Mean Pressure 1008 hPa 1017 hPa 1027 hPa, 2009 980 hPa, 2019
Mean Wind Speed 2.8 mph (-2.3) 3.5 mph (-1.6) 9.6 mph, 2011 2.5 mph, 2012
Maximum Wind Speed 6.6 mph 11:15 9.4 mph 20.8 mph, 2011 6.6 mph, 2022
Maximum Gust 10.4 mph 11:53 14.3 mph 33.4 mph, 2017 10.0 mph, 2012
Mean Wind Direction E
Rainfall 0.0 mm 9.2 mm (38%) 10.1 mm, 2017
Maximum Hourly Rain 0.0 mm 4.9 mm, 2011
Maximum 10-min Rain 0.0 mm 3.0 mm, 2011
Maximum Rain Rate n/a 30, 2011
Minimum Dew Point -3.6 °C 03:54 -0.8 °C 7.7 °C, 2021 -3.7 °C, 2012
Maximum Dew Point -1.4 °C 14:27 2.3 °C 10.9 °C, 2011 -1.4 °C, 2022
Mean Dew Point -2.4 °C 0.8 °C 8.7 °C, 2013 -2.4 °C, 2022
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) -2.6 °C 03:56 0.9 °C 10.4 °C, 2021 -2.6 °C, 2022
Day Maximum (09-21) 1.1 °C 13:00 4.4 °C 13.5 °C, 2016 0.8 °C, 2012
Max 10m Temp Rise 0.3 °C 04:13 0.3 °C 0.6 °C, 2009 0.2 °C, 2013
Max 1hr Temp Rise 1.5 °C 11:43 1.0 °C 2.1 °C, 2014 0.2 °C, 2024
Max 1hr Hum Rise 6% 15:11 4% 12%, 2011 2%, 2016
Max 10m Temp Fall 0.3 °C 01:02 0.4 °C 1.8 °C, 2015 0.2 °C, 2010
Max 1hr Temp Fall 0.9 °C 15:20 1.3 °C 4.5 °C, 2015 0.4 °C, 2024
Max 1hr Hum Fall 7% 11:42 4% 13%, 2014 1%, 2015
Max 10m Wind Speed 5.1 mph 18:06 7.1 mph 17.4 mph, 2011 4.9 mph, 2012
Minimum Feels-like -7.0 °C 04:11 -3.5 °C 6.5 °C, 2021 -7.0 °C, 2022
Maximum Feels-like 1.1 °C 12:33 3.9 °C 14.9 °C, 2016 1.1 °C, 2012
Mean Feels-like -3.2 °C 0.1 °C 11.9 °C, 2016 -3.2 °C, 2022
Air-frost Hrs 20 hrs 9 hrs 20 hrs, 2022 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.7 °C (-0.8) 4.0 °C (-0.9) 9.0 °C (+4.5), 2020 1.8 °C (-2.7), 2021
Humidity Range 12% 11% 39%, 2011 2%, 2016
Pressure Range 6 hPa 4 hPa 22 hPa, 2023 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]27 hrs (99%) [29%] 7 [99%], 2018 0 [0%], 2013
Wet Hours 07 hrs (27%) [2.2%] 10, 2015 0, 2010
Cloud Cover Overcast
Events Lying Snow (at 09z): ~8 cm
Air Frost
Comments lysing snow remains mostly intact
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 3.5 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th December 2022.
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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