Daily Report for 11th January 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.4 °C (+3.4) 23:56 3.8 °C (+0.7) 7.2 °C (+4.2), 2012 -2.0 °C (-5.0), 2009
Maximum Temperature 10.4 °C (+2.6) 15:00 9.3 °C (+1.5) 11.1 °C (+3.3), 2012 0.8 °C (-7.0), 2010
Mean Temperature 9.1 °C (+3.0) 6.7 °C (+1.1) 9.2 °C, 2020 0.4 °C, 2010
Minimum Humidity 89% 23:20 79% 94%, 2013 42%, 2009
Maximum Humidity 94% 16:49 93% 98%, 2010 76%, 2015
Mean Humidity 92% 87% 97%, 2010 66%, 2009
Minimum Pressure 1026 hPa 00:00 1007 hPa 1031 hPa, 2012 978 hPa, 2016
Maximum Pressure 1037 hPa 23:20 1018 hPa 1037 hPa, 2022 989 hPa, 2016
Mean Pressure 1031 hPa 1013 hPa 1032 hPa, 2012 982 hPa, 2016
Mean Wind Speed 3.4 mph (-1.8) 5.8 mph (+0.6) 10.3 mph, 2020 1.2 mph, 2013
Maximum Wind Speed 11.2 mph 03:24 14.2 mph 21.4 mph, 2017 4.5 mph, 2010
Maximum Gust 18.2 mph 03:37 23.1 mph 36.9 mph, 2020 6.0 mph, 2010
Mean Wind Direction W
Rainfall 1.0 mm 15.2 mm (73%) 16.1 mm, 2016
Maximum Hourly Rain 0.5 mm 15:04 8.2 mm, 2016
Maximum 10-min Rain 0.3 mm 16:59 2.1 mm, 2016
Maximum Rain Rate 0.5 mm/h 16:59 42 mm/h, 2016
Minimum Dew Point 4.9 °C 23:56 2.0 °C 4.9 °C, 2022 -2.4 °C, 2017
Maximum Dew Point 9.5 °C 15:00 7.2 °C 9.5 °C, 2022 0.2 °C, 2010
Mean Dew Point 7.9 °C 4.6 °C 7.9 °C, 2022 -0.8 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.6 °C * 02:17 5.1 °C 8.6 °C, 2022 -2.0 °C, 2009
Day Maximum (09-21) 10.4 °C 15:06 9.1 °C 11.1 °C, 2012 0.8 °C, 2010
Max 10m Temp Rise 0.2 °C 11:30 0.3 °C 0.4 °C, 2012 0.1 °C, 2010
Max 1hr Temp Rise 0.5 °C 11:56 1.1 °C 1.4 °C, 2015 0.2 °C, 2010
Max 1hr Hum Rise 2% 01:21 4% 7%, 2014 2%, 2010
Max 10m Temp Fall 0.3 °C 17:45 0.4 °C 0.7 °C, 2014 0.1 °C, 2010
Max 1hr Temp Fall 1.1 °C 23:50 1.3 °C 2.4 °C, 2014 0.2 °C, 2010
Max 1hr Hum Fall 2% 03:57 5% 18%, 2011 1%, 2010
Max 10m Wind Speed 8.4 mph 03:29 11.1 mph 15.2 mph, 2020 3.1 mph, 2010
Minimum Feels-like 4.9 °C 03:37 0.3 °C 4.9 °C, 2022 -2.8 °C, 2013
Maximum Feels-like 11.5 °C 14:44 9.2 °C 11.5 °C, 2012 0.8 °C, 2010
Mean Feels-like 8.1 °C 5.0 °C 8.1 °C, 2022 0.3 °C, 2010
Air-frost Hrs 0 hrs 1.0 hrs 0.2 hrs, 2014 0 hrs, 2010
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.0 °C (-0.8) 5.5 °C (+0.8) 10.5 °C (+5.7), 2009 0.7 °C (-4.1), 2010
Humidity Range 5% 14% 49%, 2009 3%, 2018
Pressure Range 11 hPa 11 hPa 20 hPa, 2011 2 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.1 [1%]23 hrs (98%) [29%] 7 [96%], 2014 0 [0%], 2010
Wet Hours 3
[Mean rain rate: 0.3 mm/h]
18 hrs (76%) [6.8%] 8, 2016 , 2009
Cloud Cover Overcast
Events None
Comments pm rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 5.0 °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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