Daily Report for 20th January 2010

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.6 °C (-0.3) 18:18 -0.7 °C (-3.8) 7.6 °C (+4.7), 2021 -3.6 °C (-6.5), 2015
Maximum Temperature 4.0 °C (-3.8) 00:04 3.0 °C (-4.8) 10.4 °C (+2.6), 2021 -0.3 °C (-8.1), 2013
Mean Temperature 3.1 °C (-2.1) 1.1 °C (-4.3) 9.8 °C, 2021 -1.0 °C, 2013
Minimum Humidity 87% 19:19 84% 87%, 2010 45%, 2017
Maximum Humidity 95% 00:57 96% 98%, 2013 76%, 2017
Mean Humidity 91% 92% 94%, 2014 67%, 2017
Minimum Pressure 1010 hPa 10:19 1009 hPa 1045 hPa, 2020 974 hPa, 2021
Maximum Pressure 1016 hPa 12:04 1018 hPa 1050 hPa, 2020 996 hPa, 2009
Mean Pressure 1013 hPa 1014 hPa 1048 hPa, 2020 988 hPa, 2021
Mean Wind Speed 4.8 mph (-0.4) 4.2 mph (-1.0) 13.7 mph, 2021 0.4 mph, 2014
Maximum Wind Speed 10.7 mph 10.1 mph 24.7 mph, 2021 4.0 mph, 2016
Maximum Gust 17.0 mph 05:53 14.9 mph 37.6 mph, 2021 4.9 mph, 2016
Mean Wind Direction ENE
Rainfall 0.3 mm 32.3 mm (85%) 8.0 mm, 2013
Maximum Hourly Rain n/a 2.2, 2018
Maximum 10-min Rain n/a 1.2, 2021
Maximum Rain Rate n/a 14.4, 2021
Minimum Dew Point 0.7 °C 19:19 -1.9 °C 5.7 °C, 2021 -5.4 °C, 2016
Maximum Dew Point 3.3 °C 00:03 1.6 °C 8.9 °C, 2021 -1.9 °C, 2017
Mean Dew Point 1.7 °C -0.1 °C 8.2 °C, 2021 -3.3 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 3.2 °C * -0.3 °C 9.8 °C, 2021 -3.6 °C, 2015
Day Maximum (09-21) * 3.0 °C * 2.9 °C 10.3 °C, 2021 -0.3 °C, 2013
Max 10m Temp Rise 0.1 °C 16:26 0.3 °C 0.7 °C, 2014 0.1 °C, 2010
Max 1hr Temp Rise 0.1 °C 16:51 0.9 °C 2.6 °C, 2014 0.1 °C, 2010
Max 1hr Hum Rise 1% 14:34 3% 9%, 2024 1%, 2010
Max 10m Temp Fall 0.1 °C 00:11 0.2 °C 0.8 °C, 2021 0.1 °C, 2010
Max 1hr Temp Fall 0.3 °C 05:09 0.7 °C 1.8 °C, 2014 0.3 °C, 2010
Max 1hr Hum Fall 3% 09:35 4% 10%, 2017 2%, 2013
Max 10m Wind Speed 8.0 mph 05:46 7.2 mph 17.8 mph, 2021 3.0 mph, 2016
Minimum Feels-like -1.6 °C 05:53 -5.1 °C 2.9 °C, 2021 -8.4 °C, 2013
Maximum Feels-like 3.8 °C 03:41 2.7 °C 11.1 °C, 2021 -0.5 °C, 2013
Mean Feels-like 1.0 °C -0.9 °C 8.0 °C, 2021 -4.4 °C, 2013
Air-frost Hrs 0 hrs 7 hrs 24 hrs, 2013 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.4 °C (-3.5) 3.7 °C (-1.0) 7.8 °C (+2.9), 2015 1.4 °C (-3.5), 2010
Humidity Range 8% 12% 31%, 2017 8%, 2010
Pressure Range 6 hPa 9 hPa 23 hPa, 2021 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]41 hrs (93%) [28%] 7.7 [101%], 2017 0 [0%], 2010
Wet Hours 0.539 hrs (90%) [8.1%] 13, 2013 , 2009
Cloud Cover not available
Events None
Comments 14, 15 Slight Rain
Extra Comments
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 20th January 2010.
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

day graph

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose