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) 18.8 °C (+3.5), 2011 12.8 °C (-2.5), 2015
Mean Temperature 11.1 °C (-0.6) 12.5 °C (-0.0) 16.3 °C, 2011 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 73%, 2012
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) 6.9 mph, 2012 3.0 mph, 2015
Maximum Wind Speed 12.0 mph 11.0 mph 16.3 mph, 2012 8.5 mph, 2015
Maximum Gust 17.7 mph 14:26 16.5 mph 25.6 mph, 2012 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 14.3 °C, 2011 7.9 °C, 2015
Mean Dew Point 6.3 °C 9.2 °C 12.7 °C, 2011 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 18.8 °C, 2011 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 0.3, 2010
Max 1hr Temp Fall n/a 21:38 0.0 °C 2, 2013 1.1, 2010
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 11.6 mph, 2016 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 21.7 °C, 2011 12.8 °C, 2015
Mean Feels-like 13.2 °C 11.8 °C 19.0 °C, 2011 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 time of the extremum (if the value persisted for >1 minute).
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; their reliablity is questionable and they are provided for interest only.
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