Daily Report for 13th February 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.8 °C (-2.0) 04:06 -3.0 °C (-6.0) 7.1 °C (+4.3), 2022 -3.9 °C (-6.7), 2021
Maximum Temperature 6.3 °C (-1.7) 13:14 2.3 °C (-5.6) 11.7 °C (+3.7), 2023 1.5 °C (-6.5), 2021
Mean Temperature 3.8 °C (-1.9) -0.2 °C (-5.8) 8.2 °C, 2022 -1.1 °C, 2021
Minimum Humidity 76% 13:00 65% 83%, 2016 51%, 2014
Maximum Humidity 98% 06:22 88% 98%, 2009 75%, 2021
Mean Humidity 92% 78% 92%, 2012 64%, 2021
Minimum Pressure 1023 hPa 18:27 1032 hPa 1033 hPa, 2023 983 hPa, 2016
Maximum Pressure 1034 hPa 00:07 1038 hPa 1037 hPa, 2023 993 hPa, 2016
Mean Pressure 1028 hPa 1035 hPa 1035 hPa, 2023 986 hPa, 2016
Mean Wind Speed 4.1 mph (-1.0) 3.5 mph (-1.6) 10.9 mph, 2022 2.8 mph, 2023
Maximum Wind Speed 18.5 mph 11.4 mph 20.9 mph, 2020 8.9 mph, 2023
Maximum Gust 19.2 mph 23:40 15.3 mph 33.4 mph, 2018 12.7 mph, 2023
Mean Wind Direction NW
Rainfall 1.1 mm 16.2 mm (80%) 9.4 mm, 2022
Maximum Hourly Rain 0.6 mm 15:44 2.9 mm, 2020
Maximum 10-min Rain 0.5 mm 18:03 0.9 mm, 2020
Maximum Rain Rate 1.6 mm/h 18:04 18 mm/h, 2020
Minimum Dew Point 0.1 °C 00:12 -6.9 °C 4.4 °C, 2022 -8.7 °C, 2021
Maximum Dew Point 4.7 °C 17:09 -1.0 °C 10.4 °C, 2024 -5.1 °C, 2021
Mean Dew Point 2.6 °C -3.8 °C 6.7 °C, 2024 -7.2 °C, 2021
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 0.8 °C 04:04 -2.4 °C 6.8 °C, 2019 -3.9 °C, 2021
Day Maximum (09-21) 6.3 °C 13:14 2.3 °C 11.7 °C, 2023 1.1 °C, 2021
Max 10m Temp Rise 0.5 °C 04:19 0.4 °C 0.6 °C, 2023 0.1 °C, 2011
Max 1hr Temp Rise 1.3 °C 11:47 1.4 °C 1.9 °C, 2023 0.5 °C, 2011
Max 1hr Hum Rise 9% 14:15 6% 9%, 2012 3%, 2011
Max 10m Temp Fall 0.2 °C 13:26 0.3 °C 0.5 °C, 2018 0.1 °C, 2013
Max 1hr Temp Fall 0.6 °C 14:09 1.1 °C 1.9 °C, 2023 0.3 °C, 2013
Max 1hr Hum Fall 15% 12:25 9% 15%, 2012 3%, 2011
Max 10m Wind Speed 8.9 mph 21:03 7.6 mph 15.9 mph, 2020 6.4 mph, 2023
Minimum Feels-like -2.3 °C 01:27 -6.9 °C 2.6 °C, 2019 -12.5 °C, 2021
Maximum Feels-like 5.7 °C 15:05 1.8 °C 13.0 °C, 2024 -1.5 °C, 2021
Mean Feels-like 1.9 °C -2.1 °C 6.6 °C, 2023 -6.6 °C, 2021
Air-frost Hrs 0 hrs 11 hrs 14 hrs, 2021 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.5 °C (+0.3) 5.4 °C (+0.4) 9.4 °C (+4.2), 2023 2.7 °C (-2.5), 2022
Humidity Range 22% 23% 35%, 2009 9%, 2016
Pressure Range 11 hPa 6 hPa 23 hPa, 2022 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]43 hrs (125%) [39%] 8.8 [100%], 2023 0 [0%], 2011
Wet Hours 3
[Mean rain rate: 0.4 mm/h]		19 hrs (81%) [6%] 12, 2016 , 2009
Cloud Cover Overcast
Events None
Comments 13-16, 18, 21 Light Rain/Drizzle Showers
Extra Comments snow traces remain on Hampstead Heath
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 13th February 2012.
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