Daily Report for 22nd January 2024

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.0 °C (+4.1) 23:58 2.0 °C (-1.0) 7.6 °C (+4.7), 2018 -4.8 °C (-7.7), 2013
Maximum Temperature 12.4 °C (+4.6) 02:08 6.2 °C (-1.6) 12.4 °C (+4.6), 2024 2.5 °C (-5.3), 2013
Mean Temperature 9.6 °C (+4.4) 4.1 °C (-1.3) 9.6 °C, 2024 -0.9 °C, 2023
Minimum Humidity 73% 15:09 76% 90%, 2020 47%, 2012
Maximum Humidity 93% 00:58 90% 98%, 2010 79%, 2012
Mean Humidity 82% 84% 97%, 2010 63%, 2012
Minimum Pressure 998 hPa 01:23 1009 hPa 1038 hPa, 2022 983 hPa, 2009
Maximum Pressure 1022 hPa 23:56 1020 hPa 1040 hPa, 2020 995 hPa, 2021
Mean Pressure 1009 hPa 1015 hPa 1038 hPa, 2020 991 hPa, 2009
Mean Wind Speed 11.5 mph (+6.3) 6.3 mph (+1.1) 11.5 mph, 2024 0.3 mph, 2017
Maximum Wind Speed 25.3 mph 01:39 15.6 mph 25.3 mph, 2024 4.5 mph, 2023
Maximum Gust 40.3 mph 02:05 24.1 mph 40.3 mph, 2024 6.9 mph, 2023
Mean Wind Direction W
Rainfall 3.1 mm 44.7 mm (107%) 9.0 mm, 2010
Maximum Hourly Rain 1.7 mm 04:53 4.3 mm, 2014
Maximum 10-min Rain 1.2 mm 04:29 1.2 mm, 2024
Maximum Rain Rate 30 mm/h 04:27 30 mm/h, 2024
Minimum Dew Point 3.5 °C 23:44 -0.6 °C 4.1 °C, 2014 -7.6 °C, 2017
Maximum Dew Point 11.0 °C 01:59 3.6 °C 11.0 °C, 2024 0.4 °C, 2015
Mean Dew Point 6.6 °C 1.6 °C 6.6 °C, 2024 -4.4 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.4 °C * 08:35 2.4 °C 8.4 °C, 2024 -4.8 °C, 2013
Day Maximum (09-21) * 10.3 °C * 13:20 6.0 °C 11.6 °C, 2012 2.5 °C, 2013
Max 10m Temp Rise 0.3 °C 11:52 0.3 °C 1.0 °C, 2023 0.1 °C, 2010
Max 1hr Temp Rise 0.9 °C 12:05 1.1 °C 2.2 °C, 2023 0.6 °C, 2010
Max 1hr Hum Rise 5% 17:34 5% 12%, 2019 2%, 2020
Max 10m Temp Fall 0.9 °C 04:37 0.4 °C 0.9 °C, 2024 0.1 °C, 2010
Max 1hr Temp Fall 2.3 °C 05:21 1.0 °C 2.3 °C, 2024 0.2 °C, 2010
Max 1hr Hum Fall 4% 11:22 5% 12%, 2012 0%, 2010
Max 10m Wind Speed 19.5 mph 13:11 12.0 mph 19.5 mph, 2024 3.5 mph, 2023
Minimum Feels-like 2.7 °C 23:36 -2.8 °C 4.6 °C, 2018 -8.8 °C, 2013
Maximum Feels-like 14.2 °C 01:59 5.6 °C 14.2 °C, 2024 1.1 °C, 2013
Mean Feels-like 7.7 °C 1.4 °C 7.7 °C, 2024 -2.6 °C, 2013
Air-frost Hrs 0 hrs 3 hrs 17 hrs, 2023 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.4 °C (+0.6) 4.2 °C (-0.6) 8.6 °C (+3.8), 2017 2.5 °C (-2.3), 2018
Humidity Range 20% 15% 35%, 2009 5%, 2020
Pressure Range 24 hPa 11 hPa 24 hPa, 2024 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [52%]61 hrs (126%) [37%] 7 [91%], 2017 0 [0%], 2010
Wet Hours 4
[Mean rain rate: 0.8 mm/h]
40 hrs (83%) [7.5%] 12, 2010 , 2009
Cloud Cover unknown
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 22nd January 2024.
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