Daily Report for 27th June 2023

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.8 °C (+1.9) 05:32 13.1 °C (+1.1) 18.2 °C (+5.3), 2011 10.0 °C (-2.9), 2013
Maximum Temperature 23.2 °C (+1.3) 14:32 24.8 °C (+3.9) 31.9 °C (+10.0), 2011 19.2 °C (-2.7), 2022
Mean Temperature 19.2 °C (+1.6) 18.9 °C (+2.5) 25.4 °C, 2011 15.0 °C, 2013
Minimum Humidity 56% 14:41 51% 79%, 2021 29%, 2010
Maximum Humidity 82% 23:59 87% 94%, 2009 79%, 2015
Mean Humidity 69% 70% 87%, 2021 55%, 2010
Minimum Pressure 1020 hPa 23:36 1018 hPa 1028 hPa, 2019 1002 hPa, 2017
Maximum Pressure 1024 hPa 08:14 1022 hPa 1031 hPa, 2019 1009 hPa, 2020
Mean Pressure 1022 hPa 1019 hPa 1030 hPa, 2019 1006 hPa, 2020
Mean Wind Speed 5.1 mph (+0.7) 5.1 mph (+0.7) 9.3 mph, 2020 3.0 mph, 2017
Maximum Wind Speed 12.6 mph 17:57 13.8 mph 21.1 mph, 2020 8.7 mph, 2010
Maximum Gust 18.4 mph 17:58 20.9 mph 34.6 mph, 2020 11.5 mph, 2017
Mean Wind Direction WNW
Rainfall 0.0 mm 21.6 mm (51%) 35.8 mm, 2009
Maximum Hourly Rain n/a 33.3, 2009
Maximum 10-min Rain n/a 8, 2009
Maximum Rain Rate n/a 96, 2009
Minimum Dew Point 10.9 °C 01:14 9.8 °C 14.1 °C, 2012 5.9 °C, 2013
Maximum Dew Point 16.0 °C 22:26 15.9 °C 18.2 °C, 2011 10.9 °C, 2013
Mean Dew Point 13.2 °C 12.8 °C 15.7 °C, 2012 8.5 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.8 °C 05:33 13.1 °C 18.2 °C, 2011 10.0 °C, 2013
Day Maximum (09-21) 23.2 °C 14:50 24.8 °C 31.9 °C, 2011 19.2 °C, 2022
Max 10m Temp Rise 0.5 °C 06:38 0.7 °C 1.0 °C, 2009 0.2 °C, 2021
Max 1hr Temp Rise 2.1 °C 08:55 2.5 °C 3.5 °C, 2009 1.0 °C, 2021
Max 1hr Hum Rise 5% 17:30 10% 33%, 2009 5%, 2012
Max 10m Temp Fall 0.4 °C 15:36 0.7 °C 2.0 °C, 2009 0.4 °C, 2012
Max 1hr Temp Fall 1.0 °C 01:19 2.1 °C 6.5 °C, 2009 1.0 °C, 2023
Max 1hr Hum Fall 9% 10:05 11% 19%, 2020 3%, 2021
Max 10m Wind Speed 9.7 mph 15:15 10.1 mph 16.1 mph, 2020 6.1 mph, 2017
Minimum Feels-like 16.7 °C 05:20 14.3 °C 22.5 °C, 2011 10.0 °C, 2013
Maximum Feels-like 26.9 °C 14:28 28.7 °C 36.1 °C, 2011 20.6 °C, 2013
Mean Feels-like 22.1 °C 21.7 °C 29.7 °C, 2011 15.6 °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 8.4 °C (-0.7) 11.7 °C (+2.8) 17.9 °C (+8.8), 2010 5.0 °C (-4.1), 2017
Humidity Range 26% 36% 57%, 2010 14%, 2021
Pressure Range 4 hPa 4 hPa 9 hPa, 2012 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [13%]240 hrs (138%) [59%] 14.5 [96%], 2010 0 [0%], 2017
Wet Hours 08 hrs (24%) [1.2%] 10, 2017 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 23.1 °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