Daily Report for 11th June 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.2 °C (+0.4) 00:40 11.5 °C (+1.0) 16.8 °C (+6.0), 2021 8.3 °C (-2.5), 2011
Maximum Temperature 18.0 °C (-1.7) 13:12 19.7 °C (+0.5) 24.8 °C (+5.1), 2021 12.9 °C (-6.8), 2012
Mean Temperature 13.4 °C (-0.7) 15.5 °C (+0.7) 20.1 °C, 2021 11.7 °C, 2012
Minimum Humidity 64% 13:18 51% 93%, 2012 34%, 2011
Maximum Humidity 96% 02:55 89% 98%, 2012 83%, 2014
Mean Humidity 86% 73% 97%, 2012 58%, 2014
Minimum Pressure 1010 hPa 02:38 1008 hPa 1022 hPa, 2014 1001 hPa, 2012
Maximum Pressure 1014 hPa 21:06 1016 hPa 1028 hPa, 2014 1003 hPa, 2012
Mean Pressure 1012 hPa 1012 hPa 1026 hPa, 2014 1002 hPa, 2012
Mean Wind Speed 3.4 mph (-1.0) 5.3 mph (+0.9) 8.0 mph, 2017 1.3 mph, 2016
Maximum Wind Speed 11.9 mph 18:55 14.6 mph 17.3 mph, 2017 8.5 mph, 2016
Maximum Gust 23.0 mph 01:07 23.3 mph 25.3 mph, 2020 12.6 mph, 2016
Mean Wind Direction NE
Rainfall 1.5 mm 31.6 mm (192%) 25.7 mm, 2012
Maximum Hourly Rain 1.3 mm 01:01 3.2 mm, 2012
Maximum 10-min Rain 1.1 mm 00:14 1.2 mm, 2012
Maximum Rain Rate 13 mm/h 00:11 16 mm/h, 2009
Minimum Dew Point 10.0 °C 22:59 7.5 °C 14.6 °C, 2021 1.9 °C, 2011
Maximum Dew Point 13.7 °C 14:14 12.4 °C 16.9 °C, 2021 9.7 °C, 2011
Mean Dew Point 11.0 °C 10.1 °C 15.3 °C, 2021 6.1 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.2 °C 00:42 11.8 °C 17.0 °C, 2017 8.3 °C, 2011
Day Maximum (09-21) 18.0 °C 13:23 19.4 °C 24.8 °C, 2021 12.9 °C, 2012
Max 10m Temp Rise 0.6 °C 12:46 0.7 °C 1.0 °C, 2020 0.2 °C, 2012
Max 1hr Temp Rise 1.6 °C 11:19 2.0 °C 3.2 °C, 2018 0.5 °C, 2012
Max 1hr Hum Rise 13% 14:08 12% 14%, 2009 1%, 2012
Max 10m Temp Fall 0.6 °C 13:46 0.6 °C 0.7 °C, 2010 0.1 °C, 2012
Max 1hr Temp Fall 2.0 °C 17:02 1.9 °C 2.5 °C, 2014 0.6 °C, 2012
Max 1hr Hum Fall 10% 11:22 11% 19%, 2017 1%, 2012
Max 10m Wind Speed 8.2 mph 19:02 10.6 mph 13.4 mph, 2017 6.1 mph, 2016
Minimum Feels-like 12.7 °C 00:06 11.4 °C 20.5 °C, 2021 6.0 °C, 2011
Maximum Feels-like 20.9 °C 13:35 21.3 °C 29.4 °C, 2021 15.5 °C, 2012
Mean Feels-like 15.1 °C 16.7 °C 24.2 °C, 2021 12.9 °C, 2011
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.8 °C (-2.2) 8.1 °C (-0.5) 13.4 °C (+4.5), 2015 2.7 °C (-6.2), 2012
Humidity Range 32% 38% 59%, 2011 5%, 2012
Pressure Range 4 hPa 8 hPa 12 hPa, 2009 1 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.3 [9%]53 hrs (81%) [32%] 14.4 [96%], 2015 0 [0%], 2012
Wet Hours 2
[Mean rain rate: 0.8 mm/h]
35 hrs (258%) [13%] 21, 2012 0, 2010
Cloud Cover Mostly Cloudy or Overcast
Events None
Comments o.night rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 17.0 °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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