Daily Report for 16th July 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 12.9 °C (-0.7) 04:54 14.0 °C (+1.1) 18.2 °C (+4.6), 2017 12.9 °C (-0.7), 2009
Maximum Temperature 24.1 °C (+1.6) 16:05 22.6 °C (+0.4) 30.2 °C (+7.7), 2013 17.0 °C (-5.5), 2012
Mean Temperature 17.6 °C (+0.5) 17.6 °C (+0.7) 23.7 °C, 2013 15.2 °C, 2012
Minimum Humidity 46% 18:06 51% 70%, 2011 30%, 2018
Maximum Humidity 95% 06:55 89% 95%, 2009 75%, 2013
Mean Humidity 74% 72% 83%, 2012 50%, 2013
Minimum Pressure 1009 hPa 23:38 1010 hPa 1023 hPa, 2016 995 hPa, 2011
Maximum Pressure 1021 hPa 08:31 1015 hPa 1026 hPa, 2016 1012 hPa, 2011
Mean Pressure 1015 hPa 1012 hPa 1025 hPa, 2016 1004 hPa, 2011
Mean Wind Speed n/a (-4.3) 0.0 mph (-4.3) 8.8, 2016 1.5, 2013
Maximum Wind Speed n/a 0.0 mph 17.9, 2010 8.7, 2013
Maximum Gust n/a 0.0 mph 27.4, 2016 10.9, 2013
Mean Wind Direction n/a
Rainfall 10.2 mm 33.4 mm (154%) 13.7 mm, 2011
Maximum Hourly Rain 5.5 mm 23:32 5.5 mm, 2009
Maximum 10-min Rain 2.8 mm 23:08 3.0 mm, 2011
Maximum Rain Rate 33 mm/h 21:22 60 mm/h, 2011
Minimum Dew Point 9.0 °C 19:41 9.5 °C 14.6 °C, 2016 7.2 °C, 2012
Maximum Dew Point 14.5 °C 13:52 15.0 °C 17.5 °C, 2016 13.4 °C, 2010
Mean Dew Point 12.4 °C 12.2 °C 15.8 °C, 2017 11.8 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 12.9 °C 14.0 °C 18.2 °C, 2017 12.9 °C, 2009
Day Maximum (09-21) 24.1 °C 22.6 °C 30.2 °C, 2013 17.0 °C, 2012
Max 10m Temp Rise 0.8 °C 07:50 0.6 °C 0.9 °C, 2014 0.3 °C, 2012
Max 1hr Temp Rise 2.4 °C 10:41 1.5 °C 3.6 °C, 2014 1.1 °C, 2012
Max 1hr Hum Rise 22% 21:38 7% 22%, 2009 4%, 2017
Max 10m Temp Fall 0.8 °C 21:04 0.5 °C 0.8 °C, 2009 0.3 °C, 2012
Max 1hr Temp Fall 3.4 °C 21:50 1.2 °C 3.4 °C, 2009 0.8 °C, 2012
Max 1hr Hum Fall 11% 10:59 7% 17%, 2014 6%, 2017
Max 10m Wind Speed 2.8 mph 0.5 mph 13.8 mph, 2016 2.8 mph, 2009
Minimum Feels-like n/a 0.0 °C 21.7, 2017 13.6, 2012
Maximum Feels-like n/a 0.0 °C 32.4, 2013 21.2, 2012
Mean Feels-like n/a 0.0 °C 26.1, 2017 17.7, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 11.2 °C (+2.2) 8.6 °C (-0.7) 14.7 °C (+5.7), 2018 3.8 °C (-5.2), 2012
Humidity Range 49% 38% 51%, 2014 21%, 2017
Pressure Range 12 hPa 5 hPa 17 hPa, 2011 2 hPa, 2017
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5.8 [39%]89 hrs (92%) [37%] 12 [81%], 2019 0 [0%], 2012
Wet Hours 4
[Mean rain rate: 2.5 mm/h]
23 hrs (130%) [5.9%] 6, 2011 0, 2013
Cloud Cover not available
Events Light Thunderstorm
Comments Thunderstormtorm (U); 20-00 Heavy-Torrential Rain (some Light)
Extra Comments Possible Hail Event (reported in Central London)
Issues None known
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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Daily Graph of Conditions

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