Daily Report for 7th January 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.3 °C (-1.8) 23:36 4.5 °C (+1.4) 8.7 °C (+5.6), 2014 -5.3 °C (-8.4), 2010
Maximum Temperature 6.1 °C (-1.7) 00:01 9.5 °C (+1.7) 12.6 °C (+4.8), 2020 0.1 °C (-7.7), 2010
Mean Temperature 3.9 °C (-1.8) 6.9 °C (+1.5) 10.3 °C, 2014 -2.6 °C, 2010
Minimum Humidity 74% 12:26 77% 93%, 2011 59%, 2009
Maximum Humidity 91% 23:47 92% 98%, 2011 80%, 2009
Mean Humidity 84% 86% 97%, 2011 68%, 2012
Minimum Pressure 1010 hPa 15:39 1007 hPa 1030 hPa, 2017 977 hPa, 2016
Maximum Pressure 1015 hPa 23:38 1016 hPa 1038 hPa, 2019 1000 hPa, 2016
Mean Pressure 1011 hPa 1012 hPa 1032 hPa, 2019 988 hPa, 2016
Mean Wind Speed 6.6 mph (+1.4) 6.8 mph (+1.6) 9.5 mph, 2014 2.5 mph, 2017
Maximum Wind Speed 15.3 mph 11:40 15.4 mph 21.9 mph, 2014 7.9 mph, 2021
Maximum Gust 22.8 mph 01:12 24.9 mph 34.2 mph, 2016 10.5 mph, 2017
Mean Wind Direction W
Rainfall 0.0 mm 7.2 mm (54%) 11.8 mm, 2016
Maximum Hourly Rain 0.0 mm 3.9 mm, 2016
Maximum 10-min Rain 0.0 mm 2.4 mm, 2014
Maximum Rain Rate n/a 54, 2014
Minimum Dew Point -0.2 °C 23:27 2.4 °C 6.5 °C, 2013 -6.3 °C, 2010
Maximum Dew Point 4.1 °C 00:01 7.1 °C 11.3 °C, 2020 -1.7 °C, 2010
Mean Dew Point 1.4 °C 4.6 °C 7.9 °C, 2020 -3.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 3.0 °C * 08:29 6.1 °C 9.9 °C, 2014 -5.3 °C, 2010
Day Maximum (09-21) * 5.8 °C * 12:56 9.2 °C 12.4 °C, 2020 0.1 °C, 2010
Max 10m Temp Rise 0.3 °C 10:31 0.3 °C 0.4 °C, 2010 0.2 °C, 2012
Max 1hr Temp Rise 1.1 °C 10:51 1.1 °C 1.8 °C, 2015 0.6 °C, 2012
Max 1hr Hum Rise 6% 17:38 5% 10%, 2014 1%, 2011
Max 10m Temp Fall 0.3 °C 17:38 0.5 °C 0.9 °C, 2016 0.1 °C, 2013
Max 1hr Temp Fall 1.3 °C 17:52 1.4 °C 2.8 °C, 2016 0.3 °C, 2017
Max 1hr Hum Fall 6% 10:53 6% 14%, 2016 1%, 2017
Max 10m Wind Speed 12.0 mph 11:43 12.1 mph 16.1 mph, 2014 6.5 mph, 2017
Minimum Feels-like -4.3 °C 21:32 0.8 °C 5.2 °C, 2012 -11.5 °C, 2010
Maximum Feels-like 4.4 °C 14:21 9.3 °C 14.5 °C, 2020 0.0 °C, 2010
Mean Feels-like 0.3 °C 5.3 °C 9.8 °C, 2014 -6.3 °C, 2010
Air-frost Hrs 0 hrs 2 hrs 22 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.8 °C (+0.1) 4.9 °C (+0.3) 9.5 °C (+4.8), 2011 2.1 °C (-2.6), 2013
Humidity Range 17% 15% 26%, 2016 4%, 2017
Pressure Range 5 hPa 9 hPa 23 hPa, 2016 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [56%]16 hrs (110%) [33%] 6.7 [93%], 2018 0 [0%], 2009
Wet Hours 08 hrs (53%) [4.8%] 9, 2016 , 2009
Cloud Cover am: Sunny
pm: Mostly Cloudy
Events None
Comments -
Extra Comments delayed tip removed
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 6.0 °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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Webcam Summary of Cloud Conditions

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