Daily Report for 11th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.5 °C (+0.1) 22:52 9.5 °C (-0.2) 15.3 °C (+5.9), 2011 5.6 °C (-3.8), 2016
Maximum Temperature 15.4 °C (-0.1) 13:09 16.2 °C (+0.2) 21.8 °C (+6.3), 2018 12.6 °C (-2.9), 2013
Mean Temperature 12.3 °C (+0.0) 12.7 °C (+0.0) 17.3 °C, 2018 10.4 °C, 2016
Minimum Humidity 69% 19:46 65% 84%, 2019 46%, 2010
Maximum Humidity 94% 09:21 92% 97%, 2012 83%, 2011
Mean Humidity 85% 81% 88%, 2013 74%, 2016
Minimum Pressure 1013 hPa 15:51 1010 hPa 1021 hPa, 2016 998 hPa, 2012
Maximum Pressure 1019 hPa 00:36 1017 hPa 1024 hPa, 2016 1008 hPa, 2018
Mean Pressure 1016 hPa 1014 hPa 1022 hPa, 2016 1004 hPa, 2012
Mean Wind Speed 5.0 mph (+0.9) 3.9 mph (-0.2) 8.9 mph, 2019 1.6 mph, 2016
Maximum Wind Speed 12.7 mph 10.9 mph 26.5 mph, 2019 10.7 mph, 2012
Maximum Gust 18.4 mph 19:34 16.4 mph 32.3 mph, 2019 14.3 mph, 2012
Mean Wind Direction W
Rainfall trace 18.6 mm (81%) 7.6, 2013
Maximum Hourly Rain n/a 3.2, 2012
Maximum 10-min Rain n/a 1.7, 2012
Maximum Rain Rate n/a 40, 2017
Minimum Dew Point 6.0 °C 21:34 6.5 °C 12.6 °C, 2018 2.4 °C, 2016
Maximum Dew Point 13.2 °C 16:51 12.4 °C 15.0 °C, 2018 8.8 °C, 2016
Mean Dew Point 10.1 °C 9.4 °C 13.9 °C, 2018 5.9 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.5 °C * 10.1 °C 15.8 °C, 2011 5.6 °C, 2016
Day Maximum (09-21) 15.4 °C 15.7 °C 21.8 °C, 2018 12.6 °C, 2013
Max 10m Temp Rise n/a 12:18 0.0 °C 0.7, 2014 0.2, 2019
Max 1hr Temp Rise n/a 13:08 0.0 °C 3, 2016 0.7, 2019
Max 1hr Hum Rise n/a 14:30 0% 12, 2013 3, 2012
Max 10m Temp Fall n/a 12:08 0.0 °C 0.8, 2017 0.2, 2012
Max 1hr Temp Fall n/a 20:03 0.0 °C 2.2, 2017 0.6, 2012
Max 1hr Hum Fall n/a 13:08 0% 12, 2014 1, 2012
Max 10m Wind Speed 9.6 mph 19:45 6.3 mph 16.8 mph, 2019 7.2 mph, 2015
Minimum Feels-like 10.9 °C 21:51 7.6 °C 17.8 °C, 2011 3.4 °C, 2016
Maximum Feels-like 17.6 °C 16:50 14.7 °C 25.7 °C, 2018 14.8 °C, 2013
Mean Feels-like 14.5 °C 11.6 °C 20.6 °C, 2018 10.4 °C, 2016
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 5.9 °C (-0.2) 6.7 °C (+0.4) 9.3 °C (+3.2), 2016 3.1 °C (-3.0), 2011
Humidity Range 25% 27% 45%, 2010 9%, 2019
Pressure Range 6 hPa 7 hPa 14 hPa, 2012 3 hPa, 2014
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 1.5 [15%]29 hrs (72%) [26%] 9.7 [98%], 2010 0 [0%], 2012
Wet Hours 119 hrs (108%) [7.1%] 10, 2013 0, 2010
Cloud Cover not available
Events None
Comments 14-16 SLight/Light Drizzle
Extra Comments
Issues MISSING DATA: 3rd - 6th, 11th - 21st. Figures obtained from local PWSs, Hampstead and METARs, with wind data obtained by regressional analysis from London AP METARs.
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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