Daily Report for 4th October 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.3 °C (+0.4) 21:41 7.2 °C (-2.7) 15.8 °C (+5.9), 2011 7.2 °C (-2.7), 2012
Maximum Temperature 15.2 °C (-1.1) 14:23 15.2 °C (-1.2) 20.4 °C (+4.1), 2013 10.9 °C (-5.4), 2020
Mean Temperature 13.0 °C (-0.3) 11.5 °C (-1.9) 17.7 °C, 2013 9.8 °C, 2020
Minimum Humidity 77% 12:57 69% 92%, 2020 50%, 2009
Maximum Humidity 95% 22:44 94% 98%, 2010 81%, 2011
Mean Humidity 87% 85% 95%, 2010 69%, 2009
Minimum Pressure 1004 hPa 02:31 1004 hPa 1030 hPa, 2016 981 hPa, 2020
Maximum Pressure 1011 hPa 23:49 1016 hPa 1032 hPa, 2016 989 hPa, 2020
Mean Pressure 1006 hPa 1011 hPa 1031 hPa, 2016 984 hPa, 2020
Mean Wind Speed 4.8 mph (+0.7) 4.0 mph (-0.1) 7.2 mph, 2017 1.9 mph, 2010
Maximum Wind Speed 13.5 mph 14:18 14.3 mph 18.7 mph, 2016 7.1 mph, 2010
Maximum Gust 19.6 mph 12:29 19.9 mph 30.6 mph, 2016 10.5 mph, 2010
Mean Wind Direction WSW
Rainfall 1.1 mm 19.6 mm (223%) 23.0 mm, 2020
Maximum Hourly Rain 0.7 mm 01:01 4.0 mm, 2021
Maximum 10-min Rain 0.4 mm 00:40 2.2 mm, 2021
Maximum Rain Rate 2.6 mm/h 00:45 30 mm/h, 2021
Minimum Dew Point 8.9 °C 21:40 5.8 °C 12.8 °C, 2013 4.0 °C, 2009
Maximum Dew Point 12.4 °C 01:58 11.8 °C 17.4 °C, 2013 9.0 °C, 2012
Mean Dew Point 10.8 °C 8.9 °C 15.2 °C, 2013 7.0 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.9 °C * 21:39 8.2 °C 16.3 °C, 2013 7.2 °C, 2012
Day Maximum (09-21) 15.2 °C 15:39 15.2 °C 20.4 °C, 2013 10.6 °C, 2020
Max 10m Temp Rise 0.4 °C 01:52 0.4 °C 0.6 °C, 2012 0.2 °C, 2020
Max 1hr Temp Rise 1.3 °C 08:55 1.8 °C 3.1 °C, 2015 0.7 °C, 2020
Max 1hr Hum Rise 5% 19:29 10% 16%, 2021 2%, 2020
Max 10m Temp Fall 0.4 °C 18:53 0.6 °C 0.9 °C, 2014 0.3 °C, 2010
Max 1hr Temp Fall 1.9 °C 19:30 2.2 °C 2.8 °C, 2014 0.9 °C, 2012
Max 1hr Hum Fall 6% 12:23 12% 16%, 2012 1%, 2020
Max 10m Wind Speed 10.3 mph 12:59 8.8 mph 15.0 mph, 2016 5.2 mph, 2010
Minimum Feels-like 11.1 °C 21:40 6.2 °C 18.6 °C, 2013 0.0 °C, 2009
Maximum Feels-like 17.4 °C 16:56 16.9 °C 24.5 °C, 2013 0.0 °C, 2009
Mean Feels-like 14.7 °C 12.6 °C 21.8 °C, 2013 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.9 °C (-1.5) 7.9 °C (+1.4) 10.4 °C (+4.0), 2014 2.0 °C (-4.4), 2020
Humidity Range 18% 25% 40%, 2012 3%, 2020
Pressure Range 7 hPa 13 hPa 11 hPa, 2014 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2.5 [24%]13 hrs (88%) [32%] 9 [87%], 2016 0 [0%], 2020
Wet Hours 2
[Mean rain rate: 0.6 mm/h]
11 hrs (174%) [11%] 18, 2020 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy
Events None
Comments o.night Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 14.0 °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

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Webcam Summary of Cloud Conditions

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Wind rose