Daily Report for 2nd January 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 0.3 °C (-2.9) 22:24 3.9 °C (+0.7) 9.3 °C (+6.1), 2022 -1.5 °C (-4.7), 2010
Maximum Temperature 7.8 °C (-0.0) 13:39 10.0 °C (+2.2) 13.2 °C (+5.4), 2022 3.2 °C (-4.6), 2011
Mean Temperature 5.3 °C (-1.5) 7.8 °C (+1.5) 11.3 °C, 2022 0.7 °C, 2010
Minimum Humidity 78% 13:47 78% 88%, 2016 51%, 2015
Maximum Humidity 96% 09:22 94% 98%, 2013 82%, 2017
Mean Humidity 91% 88% 92%, 2013 69%, 2015
Minimum Pressure 1010 hPa 00:02 1007 hPa 1041 hPa, 2019 984 hPa, 2014
Maximum Pressure 1025 hPa 21:19 1018 hPa 1044 hPa, 2019 998 hPa, 2014
Mean Pressure 1018 hPa 1013 hPa 1043 hPa, 2019 993 hPa, 2014
Mean Wind Speed 2.9 mph (-2.3) 5.0 mph (-0.2) 9.3 mph, 2022 2.1 mph, 2021
Maximum Wind Speed 8.5 mph 04:11 13.1 mph 23.5 mph, 2018 7.4 mph, 2011
Maximum Gust 11.5 mph 00:45 19.0 mph 47.2 mph, 2018 9.4 mph, 2011
Mean Wind Direction WNW
Rainfall 0.2 mm 4.5 mm (118%) 12.8 mm, 2018
Maximum Hourly Rain 0.2 mm 5.5 mm, 2018
Maximum 10-min Rain 0.2 mm 3.3 mm, 2018
Maximum Rain Rate n/a 53, 2018
Minimum Dew Point -0.7 °C 22:15 2.9 °C 6.6 °C, 2022 -3.4 °C, 2017
Maximum Dew Point 6.5 °C 00:16 8.3 °C 11.5 °C, 2015 0.2 °C, 2010
Mean Dew Point 3.9 °C 5.9 °C 9.1 °C, 2022 -1.7 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.4 °C * 08:42 8.3 °C 11.1 °C, 2022 -1.5 °C, 2010
Day Maximum (09-21) 7.8 °C 13:39 9.8 °C 12.0 °C, 2022 3.2 °C, 2011
Max 10m Temp Rise 0.4 °C 22:48 0.3 °C 0.4 °C, 2014 0.1 °C, 2015
Max 1hr Temp Rise 1.0 °C 23:31 0.8 °C 1.4 °C, 2010 0.3 °C, 2015
Max 1hr Hum Rise 6% 17:51 7% 8%, 2018 1%, 2011
Max 10m Temp Fall 0.4 °C 17:03 0.5 °C 0.4 °C, 2014 0.1 °C, 2016
Max 1hr Temp Fall 2.1 °C 17:42 1.9 °C 2.1 °C, 2023 0.4 °C, 2016
Max 1hr Hum Fall 8% 11:42 7% 22%, 2015 1%, 2016
Max 10m Wind Speed 6.2 mph 02:11 9.2 mph 20.0 mph, 2018 5.0 mph, 2011
Minimum Feels-like -1.5 °C 22:39 1.8 °C 5.5 °C, 2022 -5.3 °C, 2010
Maximum Feels-like 7.4 °C 00:57 10.4 °C 15.2 °C, 2022 3.0 °C, 2011
Mean Feels-like 3.9 °C 7.2 °C 11.8 °C, 2022 -0.9 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 6 hrs, 2010 0 hrs, 2011
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.5 °C (+2.9) 6.1 °C (+1.4) 7.8 °C (+3.2), 2013 1.7 °C (-2.9), 2019
Humidity Range 18% 16% 42%, 2015 4%, 2016
Pressure Range 15 hPa 11 hPa 23 hPa, 2018 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [71%]5 hrs (119%) [35%] 6.5 [92%], 2012 0 [0%], 2016
Wet Hours 17 hrs (162%) [15%] 9, 2016 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 5.5 °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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Wind rose