Daily Report for 1st May 2010

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.3 °C (+3.2) 22:17 9.3 °C (+3.1) 10.8 °C (+4.7), 2012 1.5 °C (-4.6), 2016
Maximum Temperature 16.0 °C (+1.3) 13:48 16.0 °C (+1.2) 21.0 °C (+6.3), 2009 12.7 °C (-2.0), 2017
Mean Temperature 11.4 °C (+2.3) 11.4 °C (+2.1) 14.1 °C, 2009 8.6 °C, 2015
Minimum Humidity 54% 15:16 54% 72%, 2014 33%, 2016
Maximum Humidity 94% 04:12 94% 97%, 2012 66%, 2011
Mean Humidity 82% 82% 90%, 2014 52%, 2011
Minimum Pressure 1008 hPa 12:03 1008 hPa 1026 hPa, 2016 997 hPa, 2020
Maximum Pressure 1010 hPa 00:11 1010 hPa 1029 hPa, 2016 1006 hPa, 2020
Mean Pressure 1009 hPa 1009 hPa 1027 hPa, 2016 1000 hPa, 2020
Mean Wind Speed 3.6 mph (-1.1) 3.6 mph (-1.1) 9.2 mph, 2011 1.6 mph, 2014
Maximum Wind Speed 9.6 mph 9.6 mph 18.5 mph, 2011 8.5 mph, 2014
Maximum Gust 13.9 mph 17:17 13.9 mph 27.3 mph, 2011 12.3 mph, 2014
Mean Wind Direction WSW
Rainfall 31.7 mm 31.7 mm (1927%) 31.7 mm, 2010
Maximum Hourly Rain 13.1 mm 18:51 13.1 mm, 2010
Maximum 10-min Rain 4.1 mm 18:05 4.1 mm, 2010
Maximum Rain Rate 60 mm/h 17:57 60 mm/h, 2010
Minimum Dew Point 5.6 °C 16:27 5.6 °C 8.2 °C, 2012 -2.7 °C, 2013
Maximum Dew Point 10.1 °C 11:20 10.1 °C 13.6 °C, 2012 2.8 °C, 2015
Mean Dew Point 8.1 °C 8.1 °C 10.7 °C, 2012 0.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.7 °C * 9.7 °C 10.8 °C, 2012 1.5 °C, 2016
Day Maximum (09-21) 16.0 °C 16.0 °C 21.0 °C, 2009 12.7 °C, 2017
Max 10m Temp Rise 0.6 °C 11:16 0.6 °C 1.6 °C, 2009 0.3 °C, 2014
Max 1hr Temp Rise 1.8 °C 11:40 1.8 °C 4.5 °C, 2016 0.7 °C, 2014
Max 1hr Hum Rise 16% 17:56 16% 18%, 2020 4%, 2014
Max 10m Temp Fall 0.7 °C 18:13 0.7 °C 2.4 °C, 2020 0.3 °C, 2014
Max 1hr Temp Fall 2.7 °C 18:38 2.7 °C 3.3 °C, 2020 0.7 °C, 2014
Max 1hr Hum Fall 12% 11:58 12% 22%, 2013 3%, 2014
Max 10m Wind Speed n/a 17:33 0.0 mph 13, 2018 6.2, 2014
Minimum Feels-like 7.6 °C 06:32 7.6 °C 12.2 °C, 2012 -0.9 °C, 2018
Maximum Feels-like 16.6 °C 13:44 16.6 °C 19.2 °C, 2012 13.0 °C, 2017
Mean Feels-like 10.9 °C 10.9 °C 14.8 °C, 2012 7.3 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (-1.9) 6.7 °C (-1.9) 15.3 °C (+6.7), 2016 3.2 °C (-5.4), 2014
Humidity Range 40% 40% 56%, 2013 17%, 2017
Pressure Range 2 hPa 2 hPa 16 hPa, 2017 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [15%]2 hrs (34%) [15%] 11 [82%], 2011 0 [0%], 2014
Wet Hours 6
[Mean rain rate: 5 mm/h]
6 hrs (465%) [25%] 13, 2014 0, 2009
Cloud Cover am: Mostly Cloudy
pm: Partly Cloudy or Overcast
Events None
Comments 17-00 Heavy Rain (1730-18 Very Heavy; 20-21, 22-23 broken)
Extra Comments
Issues No wind data due to house move - Mean values based on Heathrow; Speed and Gust regressionaly derived from the Mean
Observer Absent? Yes - observations may be unreliable
Pond Temperature (Heath) 0.0 °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, Wet hrs, Cloud cover and Events are based on manual equipment/observations (entered with a delay of 1-10 days); their reliablity is questionable and they are provided for interest only.
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