Daily Report for 30th June 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 16.1 °C (+4.1) 05:48 12.4 °C (+1.2) 17.2 °C (+5.2), 2010 8.5 °C (-3.5), 2014
Maximum Temperature 24.8 °C (+3.3) 00:01 20.9 °C (+0.6) 29.4 °C (+7.9), 2009 17.6 °C (-3.9), 2021
Mean Temperature 20.6 °C (+3.7) 16.5 °C (+0.9) 22.4 °C, 2015 14.7 °C, 2021
Minimum Humidity 49% 17:05 56% 70%, 2021 24%, 2015
Maximum Humidity 83% 05:29 90% 95%, 2014 72%, 2010
Mean Humidity 65% 75% 82%, 2021 45%, 2015
Minimum Pressure 1011 hPa 00:07 1012 hPa 1024 hPa, 2011 999 hPa, 2017
Maximum Pressure 1019 hPa 23:17 1018 hPa 1026 hPa, 2011 1010 hPa, 2016
Mean Pressure 1016 hPa 1015 hPa 1025 hPa, 2011 1004 hPa, 2017
Mean Wind Speed 7.5 mph (+3.1) 5.1 mph (+0.7) 8.5 mph, 2012 1.8 mph, 2014
Maximum Wind Speed 14.2 mph 17:07 13.7 mph 20.5 mph, 2016 9.0 mph, 2014
Maximum Gust 21.9 mph 17:12 21.4 mph 27.7 mph, 2012 12.1 mph, 2014
Mean Wind Direction W
Rainfall 0.0 mm 59.1 mm (131%) 0.7 mm, 2014
Maximum Hourly Rain n/a 0.7, 2014
Maximum 10-min Rain n/a 0.3, 2014
Maximum Rain Rate n/a 0.7, 2014
Minimum Dew Point 11.0 °C 23:51 9.3 °C 11.0 °C, 2019 4.8 °C, 2011
Maximum Dew Point 18.4 °C 00:05 14.0 °C 18.4 °C, 2019 9.5 °C, 2011
Mean Dew Point 13.6 °C 11.6 °C 14.0 °C, 2009 6.8 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 16.1 °C 05:48 12.5 °C 17.2 °C, 2010 8.5 °C, 2014
Day Maximum (09-21) * 24.4 °C * 17:04 20.8 °C 29.4 °C, 2009 17.6 °C, 2021
Max 10m Temp Rise 0.6 °C 12:43 0.6 °C 0.9 °C, 2018 0.3 °C, 2021
Max 1hr Temp Rise 2.0 °C 11:20 2.1 °C 3.3 °C, 2015 1.3 °C, 2021
Max 1hr Hum Rise 8% 04:54 10% 17%, 2011 6%, 2021
Max 10m Temp Fall 0.5 °C 17:15 0.5 °C 1.6 °C, 2009 0.3 °C, 2016
Max 1hr Temp Fall 2.2 °C 21:18 1.7 °C 3.2 °C, 2009 0.9 °C, 2020
Max 1hr Hum Fall 8% 03:28 10% 17%, 2014 6%, 2020
Max 10m Wind Speed 11.4 mph 17:12 10.1 mph 16.4 mph, 2016 5.4 mph, 2021
Minimum Feels-like 18.8 °C 23:54 13.4 °C 19.3 °C, 2010 8.6 °C, 2011
Maximum Feels-like 31.0 °C 00:05 23.6 °C 31.0 °C, 2019 20.2 °C, 2021
Mean Feels-like 23.8 °C 18.7 °C 23.8 °C, 2019 15.9 °C, 2014
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 8.7 °C (-0.8) 8.5 °C (-0.6) 15.9 °C (+6.4), 2015 4.9 °C (-4.6), 2021
Humidity Range 34% 34% 57%, 2009 20%, 2020
Pressure Range 8 hPa 6 hPa 11 hPa, 2017 2 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [66%]154 hrs (86%) [34%] 15 [99%], 2015 0.3 [2%], 2020
Wet Hours 071 hrs (192%) [9.9%] 3, 2016 0, 2009
Cloud Cover Mostly Sunny
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.0 °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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