Daily Report for 25th January 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.7 °C (-1.2) 19:14 2.6 °C (-0.4) 8.6 °C (+5.7), 2012 -2.1 °C (-5.0), 2013
Maximum Temperature 3.3 °C (-4.5) 02:50 7.8 °C (-0.0) 13.5 °C (+5.7), 2016 2.9 °C (-4.9), 2013
Mean Temperature 2.4 °C (-2.8) 5.2 °C (-0.2) 11.6 °C, 2016 1.0 °C, 2013
Minimum Humidity 85% 04:04 79% 85%, 2022 60%, 2014
Maximum Humidity 88% 11:36 92% 98%, 2010 87%, 2013
Mean Humidity 86% 87% 92%, 2010 77%, 2013
Minimum Pressure 1034 hPa 16:39 1022 hPa 1034 hPa, 2022 984 hPa, 2009
Maximum Pressure 1036 hPa 23:22 1030 hPa 1038 hPa, 2010 993 hPa, 2009
Mean Pressure 1035 hPa 1026 hPa 1035 hPa, 2022 988 hPa, 2009
Mean Wind Speed 1.3 mph (-3.9) 3.6 mph (-1.6) 7.6 mph, 2016 1.3 mph, 2022
Maximum Wind Speed 7.5 mph 14:35 10.7 mph 22.8 mph, 2014 7.5 mph, 2022
Maximum Gust 11.4 mph 20:32 17.9 mph 42.4 mph, 2014 11.4 mph, 2022
Mean Wind Direction WNW
Rainfall 0.0 mm 15.4 mm (32%) 14.0 mm, 2009
Maximum Hourly Rain n/a 5.8, 2014
Maximum 10-min Rain n/a 3.7, 2014
Maximum Rain Rate n/a 60, 2014
Minimum Dew Point -0.4 °C 18:20 0.8 °C 5.7 °C, 2012 -5.0 °C, 2013
Maximum Dew Point 1.1 °C 02:04 5.4 °C 11.0 °C, 2016 0.8 °C, 2013
Mean Dew Point 0.3 °C 3.1 °C 8.2 °C, 2016 -2.6 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 1.9 °C * 08:44 3.3 °C 10.4 °C, 2016 -2.1 °C, 2013
Day Maximum (09-21) * 2.4 °C * 12:51 7.6 °C 13.5 °C, 2016 2.4 °C, 2013
Max 10m Temp Rise 0.2 °C 09:25 0.3 °C 0.5 °C, 2017 0.1 °C, 2012
Max 1hr Temp Rise 0.4 °C 20:58 1.2 °C 2.0 °C, 2015 0.3 °C, 2012
Max 1hr Hum Rise 2% 11:36 4% 21%, 2014 2%, 2010
Max 10m Temp Fall 0.2 °C 05:19 0.4 °C 1.4 °C, 2014 0.1 °C, 2011
Max 1hr Temp Fall 0.5 °C 08:11 1.2 °C 3.8 °C, 2014 0.4 °C, 2011
Max 1hr Hum Fall 2% 18:06 5% 17%, 2014 1%, 2017
Max 10m Wind Speed 5.0 mph 20:25 8.1 mph 15.2 mph, 2014 5.0 mph, 2022
Minimum Feels-like -2.6 °C 20:32 -0.6 °C 5.6 °C, 2016 -6.3 °C, 2021
Maximum Feels-like 3.3 °C 02:18 7.6 °C 14.8 °C, 2016 1.6 °C, 2013
Mean Feels-like 1.4 °C 3.9 °C 12.0 °C, 2016 -2.5 °C, 2021
Air-frost Hrs 0 hrs 0.9 hrs 8 hrs, 2021 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.6 °C (-3.2) 5.1 °C (+0.4) 9.0 °C (+4.2), 2019 1.0 °C (-3.8), 2020
Humidity Range 3% 13% 38%, 2014 3%, 2022
Pressure Range 2 hPa 8 hPa 18 hPa, 2013 2 hPa, 2022
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]69 hrs (125%) [37%] 7.9 [101%], 2021 0 [0%], 2009
Wet Hours 019 hrs (34%) [3.1%] 3, 2010 , 2009
Cloud Cover Overcast
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 4.0 °C
Notes
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 initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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