Daily Report for 9th July 2018

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.0 °C (+3.1) 05:37 15.6 °C (+3.0) 17.6 °C (+4.7), 2017 10.9 °C (-2.0), 2009
Maximum Temperature 28.8 °C (+6.6) 16:39 28.8 °C (+6.8) 31.7 °C (+9.5), 2010 18.0 °C (-4.2), 2009
Mean Temperature 22.5 °C (+4.8) 22.5 °C (+4.9) 23.3 °C, 2010 14.7 °C, 2009
Minimum Humidity 42% 14:16 35% 80%, 2020 30%, 2013
Maximum Humidity 85% 06:53 83% 95%, 2014 67%, 2015
Mean Humidity 61% 58% 90%, 2020 48%, 2015
Minimum Pressure 1024 hPa 17:02 1018 hPa 1025 hPa, 2013 1007 hPa, 2011
Maximum Pressure 1028 hPa 01:15 1022 hPa 1032 hPa, 2013 1012 hPa, 2012
Mean Pressure 1026 hPa 1020 hPa 1028 hPa, 2013 1011 hPa, 2012
Mean Wind Speed 2.5 mph (-1.8) 3.4 mph (-0.9) 10.6 mph, 2016 0.6 mph, 2021
Maximum Wind Speed 13.1 mph 19:21 11.2 mph 22.6 mph, 2016 9.0 mph, 2015
Maximum Gust 19.6 mph 18:30 16.4 mph 37.1 mph, 2016 12.5 mph, 2012
Mean Wind Direction NE
Rainfall 0.0 mm 1.5 mm (11%) 3.6 mm, 2020
Maximum Hourly Rain n/a 1.3, 2020
Maximum 10-min Rain n/a 0.9, 2020
Maximum Rain Rate n/a 18, 2020
Minimum Dew Point 12.2 °C 00:35 9.9 °C 13.4 °C, 2020 3.6 °C, 2015
Maximum Dew Point 16.7 °C 17:58 15.4 °C 16.9 °C, 2021 7.8 °C, 2015
Mean Dew Point 14.2 °C 12.9 °C 15.4 °C, 2020 5.2 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 16.0 °C 05:37 15.6 °C 17.6 °C, 2017 10.9 °C, 2009
Day Maximum (09-21) 28.8 °C 16:40 28.8 °C 31.7 °C, 2010 18.0 °C, 2009
Max 10m Temp Rise 0.8 °C 07:39 0.7 °C 0.8 °C, 2018 0.3 °C, 2020
Max 1hr Temp Rise 3.7 °C 08:09 2.7 °C 3.7 °C, 2018 1.0 °C, 2020
Max 1hr Hum Rise 12% 20:12 14% 12%, 2018 4%, 2014
Max 10m Temp Fall 1.3 °C 19:29 0.6 °C 1.3 °C, 2018 0.3 °C, 2017
Max 1hr Temp Fall 3.8 °C 19:58 2.3 °C 3.8 °C, 2018 0.9 °C, 2016
Max 1hr Hum Fall 21% 08:14 13% 21%, 2018 4%, 2020
Max 10m Wind Speed 10.9 mph 19:29 8.5 mph 18.9 mph, 2016 6.9 mph, 2015
Minimum Feels-like 18.5 °C 05:37 17.9 °C 20.8 °C, 2017 11.1 °C, 2015
Maximum Feels-like 33.2 °C 16:39 31.9 °C 34.5 °C, 2010 21.3 °C, 2012
Mean Feels-like 26.0 °C 25.3 °C 26.1 °C, 2010 17.0 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 12.8 °C (+3.4) 13.2 °C (+3.8) 15.5 °C (+6.1), 2010 3.3 °C (-6.1), 2012
Humidity Range 43% 48% 58%, 2014 13%, 2020
Pressure Range 4 hPa 4 hPa 11 hPa, 2017 1 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [54%]107 hrs (192%) [79%] 14.9 [100%], 2013 0 [0%], 2012
Wet Hours 01.5 hrs (15%) [0.7%] 5, 2020 0, 2009
Cloud Cover Partly Cloudy with periods of Mostly Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
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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Webcam Summary of Cloud Conditions

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