Daily Report for 24th January 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.2 °C (-0.7) 03:07 4.4 °C (+1.4) 9.3 °C (+6.4), 2016 -2.3 °C (-5.2), 2019
Maximum Temperature 10.0 °C (+2.2) 22:20 9.7 °C (+1.9) 14.8 °C (+7.0), 2016 1.1 °C (-6.7), 2021
Mean Temperature 6.0 °C (+0.8) 7.1 °C (+1.7) 12.4 °C, 2016 0.0 °C, 2021
Minimum Humidity 83% 00:17 66% 90%, 2019 57%, 2025
Maximum Humidity 97% 23:59 90% 97%, 2012 86%, 2017
Mean Humidity 93% 79% 93%, 2012 76%, 2009
Minimum Pressure 1016 hPa 15:52 1017 hPa 1038 hPa, 2023 984 hPa, 2009
Maximum Pressure 1021 hPa 08:06 1024 hPa 1041 hPa, 2023 995 hPa, 2009
Mean Pressure 1018 hPa 1020 hPa 1040 hPa, 2023 990 hPa, 2009
Mean Wind Speed 3.2 mph (-2.0) 5.7 mph (+0.5) 10.6 mph, 2018 0.2 mph, 2022
Maximum Wind Speed 9.7 mph 14.2 mph 27.9 mph, 2024 5.0 mph, 2022
Maximum Gust 10.2 mph 09:51 20.0 mph 46.1 mph, 2018 7.3 mph, 2017
Mean Wind Direction WSW
Rainfall 6.1 mm 40.9 mm (89%) 11.4 mm, 2018
Maximum Hourly Rain 1.7 mm 11:03 5.7 mm, 2018
Maximum 10-min Rain 0.6 mm 10:34 2.6 mm, 2018
Maximum Rain Rate 2.4 mm/h 10:35 53 mm/h, 2018
Minimum Dew Point 0.3 °C 01:49 0.5 °C 8.0 °C, 2016 -4.8 °C, 2013
Maximum Dew Point 9.5 °C 22:20 6.8 °C 13.2 °C, 2016 -0.9 °C, 2013
Mean Dew Point 4.9 °C 3.6 °C 11.7 °C, 2016 -2.2 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.2 °C 03:06 5.1 °C 10.8 °C, 2018 -2.3 °C, 2019
Day Maximum (09-21) * 9.9 °C * 20:50 9.5 °C 12.8 °C, 2018 1.1 °C, 2021
Max 10m Temp Rise 0.3 °C 08:56 0.3 °C 0.5 °C, 2017 0.1 °C, 2013
Max 1hr Temp Rise 1.1 °C 13:11 1.1 °C 1.8 °C, 2017 0.3 °C, 2013
Max 1hr Hum Rise 3% 01:19 6% 8%, 2018 1%, 2020
Max 10m Temp Fall 0.3 °C 00:42 0.4 °C 1.8 °C, 2018 0.2 °C, 2010
Max 1hr Temp Fall 0.5 °C 01:01 1.3 °C 3.6 °C, 2018 0.3 °C, 2020
Max 1hr Hum Fall 1% 04:27 9% 13%, 2025 1%, 2012
Max 10m Wind Speed 5.6 mph 02:22 9.5 mph 21.1 mph, 2024 2.0 mph, 2022
Minimum Feels-like -0.9 °C 02:04 1.5 °C 8.0 °C, 2016 -5.9 °C, 2019
Maximum Feels-like 11.1 °C 22:12 9.9 °C 14.6 °C, 2018 1.1 °C, 2021
Mean Feels-like 4.9 °C 5.8 °C 15.2 °C, 2016 -1.3 °C, 2021
Air-frost Hrs 0 hrs 0.8 hrs 10 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.8 °C (+3.0) 5.3 °C (+0.6) 7.8 °C (+3.0), 2012 1.6 °C (-3.2), 2020
Humidity Range 14% 24% 38%, 2025 3%, 2016
Pressure Range 5 hPa 7 hPa 17 hPa, 2024 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]63 hrs (119%) [35%] 7.7 [99%], 2015 0 [0%], 2010
Wet Hours 8
[Mean rain rate: 0.8 mm/h]		36 hrs (69%) [6.2%] 8, 2012 , 2009
Cloud Cover Overcast
Events None
Comments 07-14 Light Rain; broken 14-eve Light Drizzle
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath 0.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 24th January 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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

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Wind rose