Daily Report for 2nd October 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.2 °C (-4.8) 23:53 7.8 °C (-2.2) 13.8 °C (+3.8), 2014 5.2 °C (-4.8), 2019
Maximum Temperature 13.2 °C (-3.3) 15:18 16.0 °C (-0.4) 26.6 °C (+10.1), 2011 13.2 °C (-3.3), 2019
Mean Temperature 9.2 °C (-4.1) 12.1 °C (-1.3) 19.4 °C, 2011 9.2 °C, 2019
Minimum Humidity 59% 16:51 66% 85%, 2020 36%, 2011
Maximum Humidity 90% 07:30 92% 98%, 2010 80%, 2009
Mean Humidity 78% 84% 93%, 2020 63%, 2011
Minimum Pressure 1009 hPa 00:02 1003 hPa 1026 hPa, 2014 987 hPa, 2020
Maximum Pressure 1023 hPa 22:19 1016 hPa 1029 hPa, 2014 993 hPa, 2020
Mean Pressure 1018 hPa 1009 hPa 1028 hPa, 2014 990 hPa, 2020
Mean Wind Speed 3.7 mph (-0.4) 4.2 mph (+0.1) 9.0 mph, 2017 1.8 mph, 2014
Maximum Wind Speed 14.9 mph 00:16 16.1 mph 17.4 mph, 2020 7.8 mph, 2014
Maximum Gust 18.3 mph 12:58 20.1 mph 30.0 mph, 2020 9.7 mph, 2014
Mean Wind Direction NNW
Rainfall 0.0 mm 17.6 mm (401%) 31.0 mm, 2020
Maximum Hourly Rain n/a 11.2, 2010
Maximum 10-min Rain n/a 2.5, 2010
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point 3.4 °C 23:48 6.0 °C 11.4 °C, 2014 3.4 °C, 2019
Maximum Dew Point 8.7 °C 00:03 12.2 °C 16.4 °C, 2011 8.7 °C, 2019
Mean Dew Point 5.5 °C 9.4 °C 13.3 °C, 2013 5.5 °C, 2019
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.2 °C * 07:36 9.4 °C 13.9 °C, 2017 6.2 °C, 2019
Day Maximum (09-21) 13.2 °C 15:19 16.0 °C 26.6 °C, 2011 12.7 °C, 2020
Max 10m Temp Rise 0.4 °C 09:05 0.4 °C 1.0 °C, 2011 0.2 °C, 2020
Max 1hr Temp Rise 1.9 °C 09:52 1.8 °C 5.0 °C, 2011 0.8 °C, 2020
Max 1hr Hum Rise 10% 19:56 12% 12%, 2011 4%, 2020
Max 10m Temp Fall 0.6 °C 19:43 0.9 °C 0.6 °C, 2016 0.3 °C, 2013
Max 1hr Temp Fall 2.4 °C 20:28 2.9 °C 2.8 °C, 2016 0.8 °C, 2020
Max 1hr Hum Fall 14% 11:16 12% 14%, 2019 4%, 2020
Max 10m Wind Speed 7.8 mph 14:00 8.5 mph 14.3 mph, 2017 5.6 mph, 2010
Minimum Feels-like 2.5 °C 07:20 6.8 °C 16.0 °C, 2014 2.5 °C, 2019
Maximum Feels-like 13.2 °C 15:15 18.0 °C 29.0 °C, 2011 13.2 °C, 2019
Mean Feels-like 8.5 °C 13.3 °C 21.6 °C, 2011 8.5 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.0 °C (+1.5) 8.2 °C (+1.8) 14.8 °C (+8.3), 2011 3.2 °C (-3.3), 2020
Humidity Range 31% 27% 57%, 2011 11%, 2020
Pressure Range 14 hPa 13 hPa 17 hPa, 2016 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [77%]10 hrs (135%) [50%] 10.4 [100%], 2011 0 [0%], 2020
Wet Hours 07 hrs (221%) [15%] 20, 2020 0, 2009
Cloud Cover Sunny with periods of Mostly Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 14.5 °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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