Daily Report for 18th June 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.2 °C (-1.0) 23:59 11.7 °C (+0.1) 18.8 °C (+6.6), 2017 10.9 °C (-1.3), 2010
Maximum Temperature 24.1 °C (+2.9) 10:41 22.6 °C (+2.2) 31.8 °C (+10.6), 2017 16.2 °C (-5.0), 2021
Mean Temperature 18.6 °C (+1.0) 17.4 °C (+1.1) 25.9 °C, 2017 13.9 °C, 2010
Minimum Humidity 62% 00:00 51% 92%, 2021 39%, 2017
Maximum Humidity 89% 23:37 89% 96%, 2021 74%, 2017
Mean Humidity 78% 70% 94%, 2021 54%, 2017
Minimum Pressure 1015 hPa 20:32 1017 hPa 1024 hPa, 2014 996 hPa, 2011
Maximum Pressure 1020 hPa 00:11 1021 hPa 1027 hPa, 2014 1005 hPa, 2011
Mean Pressure 1019 hPa 1019 hPa 1026 hPa, 2014 1000 hPa, 2011
Mean Wind Speed 3.9 mph (-0.5) 3.7 mph (-0.7) 7.8 mph, 2018 1.1 mph, 2017
Maximum Wind Speed 13.9 mph 12:36 11.5 mph 16.6 mph, 2011 5.7 mph, 2017
Maximum Gust 26.2 mph 01:12 18.7 mph 26.2 mph, 2022 8.4 mph, 2017
Mean Wind Direction NNE
Rainfall 0.5 mm 15.2 mm (54%) 20.7 mm, 2020
Maximum Hourly Rain 0.3 mm 23:40 6.0 mm, 2021
Maximum 10-min Rain 0.3 mm 23:40 2.5 mm, 2020
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 9.3 °C 23:59 8.9 °C 13.8 °C, 2017 4.7 °C, 2015
Maximum Dew Point 18.2 °C 12:23 13.7 °C 18.2 °C, 2022 11.2 °C, 2012
Mean Dew Point 14.6 °C 11.4 °C 15.6 °C, 2017 8.2 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.8 °C * 05:15 12.1 °C 18.8 °C, 2017 10.9 °C, 2010
Day Maximum (09-21) 24.1 °C 10:41 22.6 °C 31.8 °C, 2017 14.4 °C, 2021
Max 10m Temp Rise 0.5 °C 11:23 0.7 °C 0.8 °C, 2013 0.3 °C, 2021
Max 1hr Temp Rise 1.7 °C 08:50 2.5 °C 2.5 °C, 2017 0.4 °C, 2021
Max 1hr Hum Rise 10% 12:23 10% 17%, 2011 2%, 2021
Max 10m Temp Fall 1.1 °C 12:18 0.6 °C 1.1 °C, 2022 0.3 °C, 2009
Max 1hr Temp Fall 2.6 °C 13:09 2.0 °C 2.6 °C, 2022 0.8 °C, 2021
Max 1hr Hum Fall 7% 19:55 11% 16%, 2009 2%, 2021
Max 10m Wind Speed 10.1 mph 14:07 8.9 mph 12.8 mph, 2011 3.7 mph, 2017
Minimum Feels-like 12.2 °C 23:59 12.6 °C 22.1 °C, 2017 10.9 °C, 2010
Maximum Feels-like 30.0 °C 10:39 25.4 °C 36.7 °C, 2017 18.2 °C, 2016
Mean Feels-like 22.5 °C 19.4 °C 30.3 °C, 2017 15.1 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 12.9 °C (+3.9) 10.9 °C (+2.0) 13.0 °C (+4.0), 2017 4.1 °C (-4.9), 2016
Humidity Range 27% 38% 47%, 2018 4%, 2021
Pressure Range 5 hPa 4 hPa 11 hPa, 2016 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [13%]128 hrs (111%) [48%] 11 [73%], 2017 0 [0%], 2021
Wet Hours 1
[Mean rain rate: 0.5 mm/h]
16 hrs (73%) [3.8%] 13, 2020 0, 2009
Cloud Cover unknown
Events None
Comments late rn
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 19.5 °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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