Daily Report for 30th January 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.5 °C (+0.1) 17:20 1.8 °C (-0.6) 7.6 °C (+5.2), 2020 -2.3 °C (-4.7), 2019
Maximum Temperature 7.8 °C (+0.8) 01:44 6.5 °C (-0.6) 12.4 °C (+5.4), 2020 3.0 °C (-4.0), 2010
Mean Temperature 4.5 °C (+0.5) 4.2 °C (-0.6) 9.9 °C, 2020 0.1 °C, 2010
Minimum Humidity 82% 22:30 83% 96%, 2014 48%, 2016
Maximum Humidity 95% 06:56 94% 98%, 2014 79%, 2010
Mean Humidity 91% 90% 98%, 2014 68%, 2009
Minimum Pressure 996 hPa 13:12 1008 hPa 1023 hPa, 2012 974 hPa, 2015
Maximum Pressure 1004 hPa 23:47 1016 hPa 1032 hPa, 2018 981 hPa, 2015
Mean Pressure 999 hPa 1012 hPa 1026 hPa, 2018 978 hPa, 2015
Mean Wind Speed 6.3 mph (+1.1) 4.6 mph (-0.6) 10.1 mph, 2013 2.4 mph, 2017
Maximum Wind Speed 14.8 mph 07:58 12.5 mph 23.9 mph, 2013 6.9 mph, 2012
Maximum Gust 26.2 mph 08:22 20.0 mph 35.5 mph, 2013 8.7 mph, 2012
Mean Wind Direction E
Rainfall 13.0 mm 98.4 mm (185%) 13.0 mm, 2021
Maximum Hourly Rain 3.6 mm 06:18 3.6 mm, 2021
Maximum 10-min Rain 0.8 mm 05:30 1.5 mm, 2013
Maximum Rain Rate 4.8 mm/h 05:41 30 mm/h, 2013
Minimum Dew Point 0.1 °C 23:55 0.3 °C 5.7 °C, 2020 -5.4 °C, 2010
Maximum Dew Point 6.3 °C 00:04 4.8 °C 11.6 °C, 2013 -1.9 °C, 2010
Mean Dew Point 3.1 °C 2.6 °C 8.3 °C, 2020 -4.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 4.1 °C * 08:56 2.4 °C 8.8 °C, 2013 -1.9 °C, 2010
Day Maximum (09-21) * 4.0 °C * 09:01 6.1 °C 12.4 °C, 2020 3.0 °C, 2010
Max 10m Temp Rise 0.3 °C 18:39 0.3 °C 0.7 °C, 2018 0.2 °C, 2010
Max 1hr Temp Rise 0.5 °C 11:25 1.0 °C 2.7 °C, 2018 0.5 °C, 2021
Max 1hr Hum Rise 5% 04:27 4% 9%, 2012 2%, 2014
Max 10m Temp Fall 0.6 °C 04:41 0.4 °C 0.6 °C, 2013 0.2 °C, 2010
Max 1hr Temp Fall 1.6 °C 05:13 1.1 °C 2.0 °C, 2013 0.7 °C, 2010
Max 1hr Hum Fall 3% 18:37 5% 20%, 2016 2%, 2014
Max 10m Wind Speed 12.0 mph 07:58 9.7 mph 16.9 mph, 2013 5.6 mph, 2012
Minimum Feels-like -3.1 °C 15:19 -2.4 °C 3.5 °C, 2020 -7.0 °C, 2010
Maximum Feels-like 7.8 °C 00:00 6.2 °C 14.2 °C, 2013 0.4 °C, 2010
Mean Feels-like 1.0 °C 2.1 °C 9.2 °C, 2020 -3.6 °C, 2010
Air-frost Hrs 0 hrs 3 hrs 15 hrs, 2010 0 hrs, 2013
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.3 °C (+0.7) 4.7 °C (+0.1) 9.5 °C (+4.9), 2018 3.6 °C (-1.0), 2014
Humidity Range 13% 11% 46%, 2013 2%, 2014
Pressure Range 7 hPa 8 hPa 18 hPa, 2013 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]40 hrs (69%) [18%] 7 [87%], 2010 0 [0%], 2014
Wet Hours 10
[Mean rain rate: 1.3 mm/h]
94 hrs (145%) [13%] 10, 2021 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 4.5 °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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Webcam Summary of Cloud Conditions

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