Daily Report for 24th February 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.2 °C (+4.8) 06:19 1.6 °C (-0.6) 9.7 °C (+7.3), 2012 -2.1 °C (-4.5), 2016
Maximum Temperature 10.6 °C (+2.4) 14:16 6.9 °C (-0.6) 14.7 °C (+6.5), 2019 2.0 °C (-6.2), 2013
Mean Temperature 8.9 °C (+3.6) 4.2 °C (-0.6) 11.4 °C, 2012 1.0 °C, 2013
Minimum Humidity 80% 14:54 66% 88%, 2010 41%, 2015
Maximum Humidity 95% 07:01 94% 98%, 2010 70%, 2017
Mean Humidity 88% 80% 96%, 2010 60%, 2017
Minimum Pressure 1025 hPa 01:44 1010 hPa 1034 hPa, 2019 986 hPa, 2010
Maximum Pressure 1028 hPa 16:59 1017 hPa 1038 hPa, 2019 993 hPa, 2010
Mean Pressure 1026 hPa 1014 hPa 1036 hPa, 2019 990 hPa, 2010
Mean Wind Speed n/a (-5.1) 0.0 mph (-5.1) 9, 2020 0.7, 2016
Maximum Wind Speed n/a 0.0 mph 21.9, 2020 5.2, 2016
Maximum Gust n/a 0.0 mph 33.4, 2020 8.4, 2016
Mean Wind Direction n/a
Rainfall trace 63.7 mm (181%) 6.1, 2020
Maximum Hourly Rain n/a 1.8, 2020
Maximum 10-min Rain n/a 0.5, 2010
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 5.5 °C 02:35 -1.4 °C 6.7 °C, 2012 -6.3 °C, 2016
Maximum Dew Point 8.7 °C 11:25 3.6 °C 10.2 °C, 2011 -2.6 °C, 2013
Mean Dew Point 7.3 °C 1.3 °C 8.3 °C, 2012 -3.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 7.2 °C 1.7 °C 9.7 °C, 2012 -2.1 °C, 2016
Day Maximum (09-21) 10.6 °C 6.9 °C 14.7 °C, 2019 2.0 °C, 2013
Max 10m Temp Rise 0.4 °C 12:54 0.5 °C 0.7 °C, 2014 0.2 °C, 2013
Max 1hr Temp Rise 1.1 °C 11:22 1.0 °C 2.8 °C, 2016 0.4 °C, 2013
Max 1hr Hum Rise 2% 03:11 5% 13%, 2020 2%, 2009
Max 10m Temp Fall 0.5 °C 17:10 0.5 °C 0.5 °C, 2009 0.1 °C, 2013
Max 1hr Temp Fall 0.7 °C 17:10 0.9 °C 2.2 °C, 2016 0.3 °C, 2013
Max 1hr Hum Fall 5% 13:11 6% 19%, 2016 5%, 2009
Max 10m Wind Speed n/a 0.0 mph 16, 2020 3.4, 2016
Minimum Feels-like n/a 0.0 °C 6.4, 2012 -7, 2018
Maximum Feels-like n/a 0.0 °C 14.7, 2012 -0.4, 2013
Mean Feels-like n/a 0.0 °C 11.3, 2012 -2.9, 2013
Air-frost Hrs 0 hrs 3 hrs 10 hrs, 2016 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.4 °C (-2.4) 5.3 °C (+0.0) 12.2 °C (+6.4), 2019 1.7 °C (-4.1), 2013
Humidity Range 15% 28% 49%, 2019 10%, 2010
Pressure Range 3 hPa 7 hPa 22 hPa, 2015 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]65 hrs (101%) [31%] 9.4 [100%], 2018 0 [0%], 2009
Wet Hours 0 hrs (0%) [0%] 8, 2020 , 2009
Cloud Cover not available
Events None
Comments ~9-11,12 Moderate Drizzle
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 0.0 °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

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose