Daily Report for 27th January 2020

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.6 °C (+2.7) 18:02 4.9 °C (+1.9) 7.6 °C (+4.7), 2016 -2.7 °C (-5.6), 2010
Maximum Temperature 9.2 °C (+1.4) 13:08 9.4 °C (+1.6) 13.3 °C (+5.5), 2016 2.6 °C (-5.2), 2011
Mean Temperature 7.3 °C (+2.1) 7.3 °C (+1.7) 11.8 °C, 2016 1.5 °C, 2010
Minimum Humidity 83% 11:46 79% 92%, 2021 49%, 2013
Maximum Humidity 93% 21:57 93% 98%, 2010 78%, 2011
Mean Humidity 89% 87% 95%, 2021 68%, 2011
Minimum Pressure 992 hPa 23:57 1017 hPa 1030 hPa, 2023 984 hPa, 2019
Maximum Pressure 1006 hPa 00:10 1028 hPa 1040 hPa, 2010 992 hPa, 2014
Mean Pressure 1000 hPa 1023 hPa 1034 hPa, 2024 989 hPa, 2014
Mean Wind Speed 5.5 mph (+0.3) 5.7 mph (+0.5) 10.7 mph, 2016 1.4 mph, 2021
Maximum Wind Speed 11.4 mph 10:52 14.7 mph 21.9 mph, 2016 8.2 mph, 2021
Maximum Gust 21.9 mph 10:53 23.4 mph 33.4 mph, 2016 13.5 mph, 2012
Mean Wind Direction SW
Rainfall 8.4 mm 41.5 mm (81%) 8.4 mm, 2020
Maximum Hourly Rain 4.4 mm 15:16 4.4 mm, 2020
Maximum 10-min Rain 1.5 mm 14:49 1.5 mm, 2020
Maximum Rain Rate 30 mm/h 14:47 30 mm/h, 2020
Minimum Dew Point 4.0 °C 23:37 3.0 °C 5.7 °C, 2021 -6.0 °C, 2011
Maximum Dew Point 6.9 °C 13:42 7.3 °C 11.4 °C, 2016 -1.7 °C, 2011
Mean Dew Point 5.6 °C 5.2 °C 9.6 °C, 2016 -3.7 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 7.6 °C * 08:53 5.6 °C 11.5 °C, 2016 -2.7 °C, 2010
Day Maximum (09-21) 9.2 °C 13:18 9.1 °C 13.3 °C, 2016 2.6 °C, 2011
Max 10m Temp Rise 0.4 °C 10:57 0.3 °C 0.8 °C, 2024 0.1 °C, 2011
Max 1hr Temp Rise 1.2 °C 11:37 1.0 °C 3.0 °C, 2024 0.5 °C, 2011
Max 1hr Hum Rise 6% 15:34 5% 13%, 2012 1%, 2016
Max 10m Temp Fall 0.5 °C 14:53 0.4 °C 1.2 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 1.9 °C 15:27 1.1 °C 2.8 °C, 2012 0.3 °C, 2017
Max 1hr Hum Fall 4% 08:22 5% 18%, 2013 2%, 2021
Max 10m Wind Speed 8.6 mph 11:28 11.0 mph 17.3 mph, 2016 6.3 mph, 2021
Minimum Feels-like 1.1 °C 23:25 1.3 °C 3.7 °C, 2016 -5.0 °C, 2011
Maximum Feels-like 8.5 °C 13:27 9.8 °C 15.3 °C, 2016 1.9 °C, 2011
Mean Feels-like 4.9 °C 5.8 °C 12.7 °C, 2016 -2.6 °C, 2011
Air-frost Hrs 0 hrs 0.3 hrs 8 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.6 °C (-1.2) 4.5 °C (-0.3) 8.7 °C (+3.9), 2017 1.5 °C (-3.3), 2011
Humidity Range 10% 14% 49%, 2013 4%, 2021
Pressure Range 15 hPa 11 hPa 23 hPa, 2010 2 hPa, 2023
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [13%]55 hrs (92%) [27%] 7.5 [95%], 2012 0 [0%], 2010
Wet Hours 4
[Mean rain rate: 2.1 mm/h]
54 hrs (92%) [8.3%] 7, 2013 , 2009
Cloud Cover am: Partly Cloudy
pm: Overcast
Events None
Comments pm Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.0 °C
Notes
Detailed daily weather report for Hampstead nw3 in London on 27th January 2020.
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