Daily Report for 12th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 7.7 °C (-1.6) 22:42 9.3 °C (-0.3) 14.7 °C (+5.4), 2011 6.1 °C (-3.2), 2014
Maximum Temperature 15.7 °C (+0.4) 15:10 16.1 °C (+0.2) 20.9 °C (+5.6), 2018 12.8 °C (-2.5), 2015
Mean Temperature 11.1 °C (-0.6) 12.5 °C (-0.0) 18.1 °C, 2018 10.1 °C, 2015
Minimum Humidity 57% 15:49 65% 73%, 2014 48%, 2012
Maximum Humidity 85% 22:36 91% 98%, 2013 83%, 2016
Mean Humidity 75% 80% 90%, 2014 72%, 2018
Minimum Pressure 1019 hPa 13:58 1011 hPa 1019 hPa, 2009 998 hPa, 2012
Maximum Pressure 1031 hPa 21:43 1018 hPa 1031 hPa, 2009 1009 hPa, 2012
Mean Pressure 1025 hPa 1015 hPa 1025 hPa, 2009 1005 hPa, 2012
Mean Wind Speed 4.8 mph (+0.7) 4.0 mph (-0.1) 10.5 mph, 2018 3.0 mph, 2015
Maximum Wind Speed 12.0 mph 11.0 mph 23.8 mph, 2018 8.5 mph, 2015
Maximum Gust 17.7 mph 14:26 16.5 mph 35.7 mph, 2018 13.0 mph, 2015
Mean Wind Direction NW
Rainfall 0.0 mm 18.6 mm (74%) 7.4 mm, 2014
Maximum Hourly Rain n/a 3, 2014
Maximum 10-min Rain n/a 1.9, 2013
Maximum Rain Rate n/a 54, 2013
Minimum Dew Point 4.0 °C 22:30 6.3 °C 11.5 °C, 2011 2.5 °C, 2012
Maximum Dew Point 9.1 °C 13:50 12.1 °C 14.8 °C, 2018 7.9 °C, 2015
Mean Dew Point 6.3 °C 9.2 °C 12.8 °C, 2018 5.6 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.4 °C * 10.0 °C 14.7 °C, 2011 6.1 °C, 2014
Day Maximum (09-21) 15.7 °C 15.7 °C 20.9 °C, 2018 12.8 °C, 2015
Max 10m Temp Rise n/a 13:57 0.0 °C 0.6, 2016 0.3, 2010
Max 1hr Temp Rise n/a 14:47 0.0 °C 2.5, 2016 1, 2011
Max 1hr Hum Rise n/a 21:29 0% 9, 2016 3, 2010
Max 10m Temp Fall n/a 20:50 0.0 °C 0.5, 2013 0.2, 2018
Max 1hr Temp Fall n/a 21:38 0.0 °C 2, 2013 0.4, 2018
Max 1hr Hum Fall n/a 14:40 0% 18, 2012 6, 2010
Max 10m Wind Speed 6.0 mph 12:59 6.3 mph 17.5 mph, 2018 5.6 mph, 2015
Minimum Feels-like 8.7 °C 22:23 7.7 °C 16.7 °C, 2011 5.3 °C, 2015
Maximum Feels-like 16.2 °C 15:03 14.8 °C 24.1 °C, 2018 12.8 °C, 2015
Mean Feels-like 13.2 °C 11.8 °C 20.8 °C, 2018 9.6 °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 8.0 °C (+2.0) 6.8 °C (+0.5) 8.1 °C (+2.1), 2014 4.1 °C (-1.9), 2011
Humidity Range 28% 27% 49%, 2012 18%, 2011
Pressure Range 12 hPa 8 hPa 12 hPa, 2009 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [51%]34 hrs (78%) [28%] 7 [71%], 2017 0.4 [4%], 2014
Wet Hours 019 hrs (99%) [6.5%] 5, 2014 0, 2009
Cloud Cover not available
Events None
Comments -
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
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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