Daily Report for 23rd January 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature -2.2 °C (-5.1) 23:11 2.6 °C (-0.4) 8.2 °C (+5.3), 2018 -4.9 °C (-7.8), 2023
Maximum Temperature 1.8 °C (-6.0) 15:15 7.0 °C (-0.8) 13.2 °C (+5.4), 2024 1.8 °C (-6.0), 2019
Mean Temperature 0.1 °C (-5.5) 5.0 °C (-0.6) 10.6 °C, 2018 0.1 °C, 2019
Minimum Humidity 86% 15:07 74% 88%, 2010 49%, 2009
Maximum Humidity 94% 21:56 89% 98%, 2010 83%, 2012
Mean Humidity 90% 83% 95%, 2010 71%, 2009
Minimum Pressure 997 hPa 03:03 1021 hPa 1037 hPa, 2023 967 hPa, 2009
Maximum Pressure 1010 hPa 23:58 1028 hPa 1040 hPa, 2023 985 hPa, 2009
Mean Pressure 1003 hPa 1024 hPa 1039 hPa, 2023 976 hPa, 2009
Mean Wind Speed 2.7 mph (-2.5) 4.2 mph (-1.0) 9.6 mph, 2024 0.2 mph, 2017
Maximum Wind Speed 9.3 mph 10:38 11.9 mph 29.6 mph, 2024 3.7 mph, 2017
Maximum Gust 15.0 mph 02:46 18.4 mph 38.0 mph, 2024 4.2 mph, 2017
Mean Wind Direction N
Rainfall 0.0 mm 12.6 mm (29%) 11.0 mm, 2009
Maximum Hourly Rain n/a 6.4, 2025
Maximum 10-min Rain n/a 2.6, 2025
Maximum Rain Rate n/a 36, 2025
Minimum Dew Point -3.2 °C 23:08 0.1 °C 5.0 °C, 2018 -5.9 °C, 2023
Maximum Dew Point -0.1 °C 15:13 4.2 °C 11.8 °C, 2024 -0.5 °C, 2013
Mean Dew Point -1.2 °C 2.3 °C 8.5 °C, 2018 -1.6 °C, 2023
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 0.2 °C * 03:56 3.4 °C 7.7 °C, 2018 -4.9 °C, 2023
Day Maximum (09-21) 1.8 °C 15:18 6.8 °C 12.7 °C, 2018 1.8 °C, 2019
Max 10m Temp Rise 0.2 °C 20:38 0.3 °C 0.9 °C, 2023 0.1 °C, 2010
Max 1hr Temp Rise 0.4 °C 15:10 1.1 °C 3.1 °C, 2023 0.1 °C, 2010
Max 1hr Hum Rise 3% 17:34 4% 7%, 2018 2%, 2010
Max 10m Temp Fall 0.4 °C 16:54 0.4 °C 0.6 °C, 2025 0.1 °C, 2011
Max 1hr Temp Fall 1.7 °C 17:34 1.2 °C 1.7 °C, 2019 0.3 °C, 2020
Max 1hr Hum Fall 2% 01:17 6% 21%, 2014 2%, 2017
Max 10m Wind Speed 7.4 mph 11:41 8.7 mph 18.5 mph, 2024 2.2 mph, 2017
Minimum Feels-like -5.3 °C 02:46 -0.7 °C 4.9 °C, 2018 -6.2 °C, 2015
Maximum Feels-like 1.7 °C 14:49 6.7 °C 15.4 °C, 2024 1.7 °C, 2019
Mean Feels-like -2.0 °C 3.1 °C 10.2 °C, 2018 -2.3 °C, 2013
Air-frost Hrs 7 hrs 1 hrs 11 hrs, 2015 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.0 °C (-0.8) 4.4 °C (-0.4) 11.4 °C (+6.6), 2015 1.4 °C (-3.4), 2013
Humidity Range 8% 15% 44%, 2009 5%, 2017
Pressure Range 13 hPa 8 hPa 18 hPa, 2009 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.2 [15%]45 hrs (88%) [26%] 6 [77%], 2015 0 [0%], 2011
Wet Hours 013 hrs (27%) [2.4%] 3, 2024 , 2009
Cloud Cover Partly Cloudy with periods of Mostly Cloudy
Events Lying Snow (at 09z): ~1 cm
Comments snow patches persisted
Extra Comments
Issues snow melt reassigned
Observer Absent? Yes - observations may be unreliable
Pond Temperature @ Hampstead Heath n/a
Notes
Detailed daily weather report for Hampstead nw3 in London on 23rd January 2019.
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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