Daily Report for 23rd January 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.1 °C (+2.2) 06:47 2.6 °C (-0.4) 8.2 °C (+5.3), 2018 -4.1 °C (-7.0), 2015
Maximum Temperature 6.5 °C (-1.3) 13:49 8.0 °C (+0.2) 12.7 °C (+4.9), 2018 1.8 °C (-6.0), 2019
Mean Temperature 5.7 °C (+0.5) 5.4 °C (-0.1) 10.6 °C, 2018 0.1 °C, 2019
Minimum Humidity 77% 16:28 79% 88%, 2010 49%, 2009
Maximum Humidity 86% 06:42 93% 98%, 2010 83%, 2012
Mean Humidity 81% 87% 95%, 2010 71%, 2009
Minimum Pressure 1034 hPa 23:54 1020 hPa 1034 hPa, 2022 967 hPa, 2009
Maximum Pressure 1038 hPa 00:13 1029 hPa 1038 hPa, 2022 985 hPa, 2009
Mean Pressure 1036 hPa 1025 hPa 1036 hPa, 2022 976 hPa, 2009
Mean Wind Speed 0.2 mph (-5.0) 3.8 mph (-1.4) 8.1 mph, 2018 0.2 mph, 2017
Maximum Wind Speed 5.6 mph 13:31 11.0 mph 16.8 mph, 2018 3.7 mph, 2017
Maximum Gust 14.8 mph 01:28 18.6 mph 30.0 mph, 2018 4.2 mph, 2017
Mean Wind Direction WNW
Rainfall 0.0 mm 15.4 mm (35%) 11.0 mm, 2009
Maximum Hourly Rain n/a 5, 2009
Maximum 10-min Rain n/a 0.9, 2014
Maximum Rain Rate n/a 6, 2014
Minimum Dew Point 1.9 °C 18:41 0.9 °C 5.0 °C, 2018 -5.6 °C, 2015
Maximum Dew Point 3.6 °C 11:03 5.7 °C 11.1 °C, 2018 -0.5 °C, 2013
Mean Dew Point 2.8 °C 3.3 °C 8.5 °C, 2018 -1.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.1 °C 07:22 3.4 °C 7.7 °C, 2018 -4.1 °C, 2015
Day Maximum (09-21) 6.5 °C 13:44 7.9 °C 12.7 °C, 2018 1.8 °C, 2019
Max 10m Temp Rise 0.2 °C 10:47 0.4 °C 0.5 °C, 2015 0.1 °C, 2010
Max 1hr Temp Rise 0.5 °C 09:14 1.3 °C 2.0 °C, 2015 0.1 °C, 2010
Max 1hr Hum Rise 2% 19:11 4% 7%, 2018 2%, 2010
Max 10m Temp Fall 0.2 °C 16:32 0.4 °C 0.4 °C, 2016 0.1 °C, 2011
Max 1hr Temp Fall 0.4 °C 17:06 1.3 °C 1.7 °C, 2019 0.3 °C, 2020
Max 1hr Hum Fall 3% 08:59 6% 21%, 2014 2%, 2017
Max 10m Wind Speed 2.4 mph 13:33 8.5 mph 12.7 mph, 2018 2.2 mph, 2017
Minimum Feels-like 1.5 °C 01:28 -0.5 °C 4.9 °C, 2018 -6.2 °C, 2015
Maximum Feels-like 6.5 °C 13:05 7.9 °C 14.3 °C, 2018 1.7 °C, 2019
Mean Feels-like 5.6 °C 4.0 °C 10.2 °C, 2018 -2.3 °C, 2013
Air-frost Hrs 0 hrs 0.9 hrs 11 hrs, 2015 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 1.4 °C (-3.4) 5.4 °C (+0.6) 11.4 °C (+6.6), 2015 1.4 °C (-3.4), 2013
Humidity Range 9% 14% 44%, 2009 5%, 2017
Pressure Range 3 hPa 9 hPa 18 hPa, 2009 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]69 hrs (136%) [40%] 6 [77%], 2015 0 [0%], 2011
Wet Hours 019 hrs (37%) [3.4%] 2, 2015 , 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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