Daily Report for 9th May 2022

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.9 °C (-2.2) 05:37 9.4 °C (+1.7) 14.2 °C (+6.1), 2016 5.9 °C (-2.2), 2022
Maximum Temperature 21.8 °C (+4.8) 16:07 18.5 °C (+1.8) 24.8 °C (+7.8), 2016 11.5 °C (-5.5), 2010
Mean Temperature 15.3 °C (+1.3) 13.7 °C (+1.8) 18.5 °C, 2016 8.4 °C, 2010
Minimum Humidity 54% 16:11 57% 72%, 2012 33%, 2016
Maximum Humidity 93% 06:12 89% 96%, 2019 74%, 2017
Mean Humidity 70% 76% 90%, 2012 56%, 2016
Minimum Pressure 1019 hPa 23:47 1023 hPa 1019 hPa, 2011 993 hPa, 2019
Maximum Pressure 1030 hPa 00:08 1027 hPa 1030 hPa, 2022 1002 hPa, 2021
Mean Pressure 1024 hPa 1025 hPa 1024 hPa, 2022 998 hPa, 2019
Mean Wind Speed 5.1 mph (+0.4) 2.6 mph (-2.1) 10.0 mph, 2013 2.4 mph, 2019
Maximum Wind Speed 15.6 mph 14:43 10.4 mph 24.6 mph, 2013 8.3 mph, 2017
Maximum Gust 24.0 mph 17:28 15.8 mph 38.4 mph, 2013 12.6 mph, 2017
Mean Wind Direction SSW
Rainfall 0.0 mm 4.3 mm (32%) 4.9 mm, 2012
Maximum Hourly Rain n/a 1.5, 2012
Maximum 10-min Rain n/a 0.9, 2012
Maximum Rain Rate n/a 10, 2016
Minimum Dew Point 4.4 °C 05:01 6.8 °C 9.3 °C, 2021 1.1 °C, 2017
Maximum Dew Point 13.2 °C 15:03 11.4 °C 14.1 °C, 2021 4.3 °C, 2017
Mean Dew Point 9.5 °C 9.2 °C 11.8 °C, 2021 2.6 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.9 °C 05:43 9.5 °C 14.2 °C, 2016 5.9 °C, 2022
Day Maximum (09-21) 21.8 °C 15:41 18.5 °C 24.8 °C, 2016 11.5 °C, 2010
Max 10m Temp Rise 0.7 °C 09:28 0.6 °C 1.0 °C, 2020 0.5 °C, 2010
Max 1hr Temp Rise 3.6 °C 09:51 2.1 °C 4.8 °C, 2020 1.7 °C, 2010
Max 1hr Hum Rise 5% 19:04 10% 28%, 2013 5%, 2015
Max 10m Temp Fall 0.3 °C 15:25 0.6 °C 1.2 °C, 2013 0.3 °C, 2010
Max 1hr Temp Fall 1.2 °C 19:53 2.0 °C 3.0 °C, 2013 1.1 °C, 2012
Max 1hr Hum Fall 13% 09:02 10% 24%, 2013 6%, 2012
Max 10m Wind Speed 13.4 mph 15:44 7.9 mph 18.7 mph, 2013 6.1 mph, 2019
Minimum Feels-like 5.9 °C 05:37 9.2 °C 14.2 °C, 2016 3.1 °C, 2017
Maximum Feels-like 24.7 °C 15:12 20.0 °C 25.7 °C, 2016 11.5 °C, 2010
Mean Feels-like 16.6 °C 14.6 °C 19.5 °C, 2016 7.1 °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 15.9 °C (+7.0) 9.0 °C (+0.1) 15.9 °C (+7.0), 2022 4.5 °C (-4.4), 2012
Humidity Range 39% 33% 56%, 2020 23%, 2012
Pressure Range 11 hPa 4 hPa 14 hPa, 2017 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 8 [58%]42 hrs (79%) [34%] 12.5 [90%], 2011 0 [0%], 2012
Wet Hours 06 hrs (52%) [2.8%] 6, 2012 0, 2009
Cloud Cover Hazy
Events None
Comments -
Extra Comments
Issues None known
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 16.0 °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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