Daily Report for 10th September 2019

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.6 °C (-1.0) 07:01 10.8 °C (-1.0) 17.2 °C (+5.6), 2021 8.8 °C (-2.8), 2013
Maximum Temperature 19.4 °C (-0.4) 13:53 18.9 °C (-1.5) 22.7 °C (+2.9), 2011 16.5 °C (-3.3), 2013
Mean Temperature 15.4 °C (-0.7) 14.9 °C (-1.3) 19.2 °C, 2011 12.3 °C, 2013
Minimum Humidity 58% 13:55 52% 83%, 2016 37%, 2015
Maximum Humidity 94% 08:08 86% 96%, 2013 84%, 2012
Mean Humidity 76% 71% 93%, 2016 68%, 2020
Minimum Pressure 1015 hPa 00:05 1018 hPa 1033 hPa, 2009 992 hPa, 2017
Maximum Pressure 1021 hPa 21:44 1024 hPa 1038 hPa, 2009 1003 hPa, 2017
Mean Pressure 1019 hPa 1021 hPa 1036 hPa, 2009 999 hPa, 2017
Mean Wind Speed 1.7 mph (-2.2) 4.4 mph (+0.5) 9.2 mph, 2012 0.6 mph, 2020
Maximum Wind Speed 11.1 mph 23:43 12.9 mph 20.0 mph, 2017 5.6 mph, 2020
Maximum Gust 17.3 mph 01:07 22.0 mph 32.3 mph, 2017 10.4 mph, 2020
Mean Wind Direction WNW
Rainfall 0.0 mm 6.1 mm (37%) 4.3 mm, 2021
Maximum Hourly Rain n/a 3.4, 2021
Maximum 10-min Rain n/a 2.9, 2021
Maximum Rain Rate n/a 30, 2021
Minimum Dew Point 8.9 °C 06:52 6.4 °C 15.2 °C, 2021 4.8 °C, 2015
Maximum Dew Point 12.6 °C 11:56 12.0 °C 18.6 °C, 2011 10.0 °C, 2020
Mean Dew Point 11.0 °C 9.5 °C 16.3 °C, 2021 8.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 10.6 °C 07:03 11.0 °C 17.8 °C, 2011 8.8 °C, 2013
Day Maximum (09-21) 19.4 °C 13:54 18.9 °C 22.7 °C, 2011 16.5 °C, 2013
Max 10m Temp Rise 0.8 °C 09:09 0.6 °C 1.0 °C, 2013 0.2 °C, 2016
Max 1hr Temp Rise 3.6 °C 09:46 2.3 °C 3.6 °C, 2019 0.6 °C, 2016
Max 1hr Hum Rise 7% 14:58 8% 12%, 2017 4%, 2010
Max 10m Temp Fall 0.3 °C 14:12 0.5 °C 0.8 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 1.1 °C 05:55 1.5 °C 2.3 °C, 2020 0.7 °C, 2010
Max 1hr Hum Fall 15% 09:47 12% 19%, 2015 3%, 2016
Max 10m Wind Speed 8.7 mph 23:49 9.3 mph 14.5 mph, 2017 3.1 mph, 2020
Minimum Feels-like 11.4 °C 06:51 10.9 °C 21.4 °C, 2021 6.0 °C, 2013
Maximum Feels-like 21.4 °C 13:52 20.5 °C 27.8 °C, 2011 17.0 °C, 2013
Mean Feels-like 17.1 °C 16.0 °C 23.8 °C, 2011 12.5 °C, 2013
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.8 °C (+0.6) 8.1 °C (-0.4) 9.8 °C (+1.6), 2009 3.7 °C (-4.5), 2021
Humidity Range 36% 34% 55%, 2015 10%, 2016
Pressure Range 6 hPa 7 hPa 11 hPa, 2017 2 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [42%]52 hrs (109%) [43%] 11 [93%], 2015 0 [0%], 2016
Wet Hours 07.5 hrs (55%) [3.1%] 7, 2016 0, 2009
Cloud Cover am: Mostly Sunny
pm: Overcast or Mostly Cloudy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 16.5 °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.
View monthly summary

Daily Graph of Conditions

day graph

Webcam Summary of Cloud Conditions

daycamsumFull resolution individual images at up-to 5 minute intervals

Wind rose