Daily Report for 7th July 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 13.5 °C (+0.8) 08:45 13.1 °C (+0.6) 18.8 °C (+6.1), 2017 9.4 °C (-3.3), 2020
Maximum Temperature 21.8 °C (-0.3) 16:34 23.6 °C (+1.6) 30.3 °C (+8.2), 2018 18.0 °C (-4.1), 2009
Mean Temperature 16.8 °C (+0.3) 18.6 °C (+1.1) 24.3 °C, 2018 15.2 °C, 2009
Minimum Humidity 52% 16:16 45% 75%, 2009 32%, 2017
Maximum Humidity 94% 06:03 86% 94%, 2019 68%, 2016
Mean Humidity 77% 65% 88%, 2009 52%, 2017
Minimum Pressure 1015 hPa 02:30 1020 hPa 1030 hPa, 2013 1002 hPa, 2009
Maximum Pressure 1020 hPa 23:25 1024 hPa 1033 hPa, 2013 1005 hPa, 2011
Mean Pressure 1018 hPa 1022 hPa 1031 hPa, 2013 1004 hPa, 2011
Mean Wind Speed 3.2 mph (-1.1) 3.1 mph (-1.2) 7.7 mph, 2011 2.4 mph, 2018
Maximum Wind Speed 10.1 mph 21:05 9.9 mph 18.1 mph, 2015 9.8 mph, 2013
Maximum Gust 21.9 mph 19:53 16.0 mph 28.4 mph, 2015 13.0 mph, 2014
Mean Wind Direction ESE
Rainfall 2.2 mm 3.3 mm (32%) 7.1 mm, 2009
Maximum Hourly Rain 0.9 mm 03:44 2.7 mm, 2009
Maximum 10-min Rain 0.2 mm 05:50 1.7 mm, 2009
Maximum Rain Rate 1.3 mm/h 03:05 33 mm/h, 2009
Minimum Dew Point 10.0 °C 21:24 9.2 °C 11.9 °C, 2009 4.7 °C, 2015
Maximum Dew Point 14.9 °C 00:19 13.6 °C 17.5 °C, 2018 11.1 °C, 2014
Mean Dew Point 12.4 °C 11.6 °C 15.0 °C, 2018 9.4 °C, 2014
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 13.5 °C 08:42 13.1 °C 18.8 °C, 2017 9.4 °C, 2020
Day Maximum (09-21) 21.8 °C 16:35 23.6 °C 30.3 °C, 2018 18.0 °C, 2009
Max 10m Temp Rise 0.5 °C 11:25 0.6 °C 0.8 °C, 2012 0.5 °C, 2015
Max 1hr Temp Rise 1.9 °C 15:02 2.3 °C 3.3 °C, 2013 1.5 °C, 2021
Max 1hr Hum Rise 9% 19:26 9% 22%, 2020 5%, 2021
Max 10m Temp Fall 0.6 °C 19:39 0.5 °C 1.4 °C, 2015 0.3 °C, 2010
Max 1hr Temp Fall 2.3 °C 20:24 1.9 °C 3.5 °C, 2014 1.2 °C, 2010
Max 1hr Hum Fall 11% 12:20 11% 16%, 2018 7%, 2010
Max 10m Wind Speed 8.3 mph 19:59 6.9 mph 15.0 mph, 2015 7.4 mph, 2017
Minimum Feels-like 15.6 °C 09:37 14.5 °C 21.9 °C, 2017 8.0 °C, 2020
Maximum Feels-like 24.1 °C 16:28 26.1 °C 34.2 °C, 2018 20.8 °C, 2011
Mean Feels-like 19.3 °C 20.7 °C 28.3 °C, 2018 16.9 °C, 2020
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.3 °C (-1.1) 10.5 °C (+1.0) 13.8 °C (+4.4), 2013 4.2 °C (-5.2), 2009
Humidity Range 42% 41% 54%, 2018 18%, 2009
Pressure Range 5 hPa 4 hPa 10 hPa, 2021 2 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.4 [23%]66 hrs (153%) [63%] 14 [93%], 2013 1 [7%], 2012
Wet Hours 4
[Mean rain rate: 0.6 mm/h]
6 hrs (78%) [3.6%] 5, 2020 0, 2010
Cloud Cover am: Overcast
pm: Partly Cloudy or Mostly Cloudy
Events None
Comments o.night Rain
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 22.0 °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