Daily Report for 8th April 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 3.8 °C (-0.9) 06:02 2.8 °C (-1.8) 9.4 °C (+4.7), 2020 3.2 °C (-1.5), 2013
Maximum Temperature 12.8 °C (+0.9) 15:23 10.5 °C (-1.3) 20.9 °C (+9.0), 2011 9.9 °C (-2.0), 2013
Mean Temperature 8.0 °C (+0.0) 6.5 °C (-1.6) 14.8 °C, 2020 5.8 °C, 2013
Minimum Humidity 53% 12:10 50% 84%, 2018 36%, 2011
Maximum Humidity 75% 23:48 83% 94%, 2018 75%, 2013
Mean Humidity 64% 67% 92%, 2018 57%, 2011
Minimum Pressure 1017 hPa 23:57 1022 hPa 1030 hPa, 2015 1000 hPa, 2009
Maximum Pressure 1026 hPa 02:08 1029 hPa 1034 hPa, 2015 1011 hPa, 2018
Mean Pressure 1022 hPa 1025 hPa 1032 hPa, 2015 1005 hPa, 2013
Mean Wind Speed 6.0 mph (+1.1) 6.2 mph (+1.3) 6.8 mph, 2014 1.0 mph, 2019
Maximum Wind Speed 14.5 mph 14:11 14.9 mph 17.5 mph, 2014 5.6 mph, 2019
Maximum Gust 21.7 mph 11:55 22.5 mph 27.0 mph, 2014 9.2 mph, 2019
Mean Wind Direction WSW
Rainfall 0.0 mm 0.1 mm (1%) 6.2 mm, 2018
Maximum Hourly Rain n/a 2, 2018
Maximum 10-min Rain n/a 0.7, 2018
Maximum Rain Rate n/a 4.4, 2019
Minimum Dew Point -1.4 °C 00:06 -2.8 °C 7.8 °C, 2018 -4.6 °C, 2013
Maximum Dew Point 4.5 °C 18:50 3.6 °C 11.1 °C, 2020 0.0 °C, 2013
Mean Dew Point 1.6 °C 0.6 °C 8.9 °C, 2018 -1.9 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 3.8 °C 06:04 3.5 °C 9.7 °C, 2018 3.2 °C, 2013
Day Maximum (09-21) 12.8 °C 15:23 10.1 °C 20.9 °C, 2011 9.9 °C, 2013
Max 10m Temp Rise 0.7 °C 11:39 0.6 °C 0.8 °C, 2017 0.2 °C, 2018
Max 1hr Temp Rise 2.0 °C 12:09 1.7 °C 3.7 °C, 2017 0.3 °C, 2018
Max 1hr Hum Rise 5% 16:14 8% 11%, 2013 3%, 2018
Max 10m Temp Fall 0.3 °C 15:52 0.5 °C 0.5 °C, 2010 0.2 °C, 2018
Max 1hr Temp Fall 1.0 °C 16:22 1.6 °C 2.4 °C, 2010 0.5 °C, 2018
Max 1hr Hum Fall 8% 09:26 10% 16%, 2014 2%, 2018
Max 10m Wind Speed 11.3 mph 14:48 11.2 mph 13.1 mph, 2014 3.7 mph, 2019
Minimum Feels-like 0.3 °C 07:29 -1.3 °C 8.3 °C, 2020 -1.6 °C, 2013
Maximum Feels-like 12.8 °C 15:22 9.6 °C 22.2 °C, 2020 8.3 °C, 2013
Mean Feels-like 6.6 °C 4.1 °C 15.4 °C, 2020 2.9 °C, 2013
Air-frost Hrs 0 hrs 1 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 9.0 °C (+1.8) 7.7 °C (+0.5) 16.5 °C (+9.3), 2017 1.6 °C (-5.6), 2018
Humidity Range 22% 33% 53%, 2009 10%, 2018
Pressure Range 9 hPa 7 hPa 15 hPa, 2014 3 hPa, 2019
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1 [8%]35 hrs (92%) [36%] 12.1 [100%], 2011 0 [0%], 2018
Wet Hours 00.4 hrs (3%) [0.2%] 10, 2018 0, 2010
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 4.5 °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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose