Daily Report for 13th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.7 °C (-3.5) 9.1 °C (-0.5) 19.1 °C (+9.9), 2018 5.1 °C (-4.1), 2012
Maximum Temperature 16.1 °C (+0.9) 16.1 °C (+0.3) 23.8 °C (+8.6), 2018 11.4 °C (-3.8), 2013
Mean Temperature 10.5 °C (-1.3) 12.4 °C (-0.1) 21.1 °C, 2018 8.6 °C, 2012
Minimum Humidity 53% 64% 96%, 2014 53%, 2009
Maximum Humidity 93% 91% 98%, 2013 79%, 2018
Mean Humidity 77% 80% 96%, 2014 69%, 2018
Minimum Pressure 1030 hPa 1012 hPa 1030 hPa, 2009 995 hPa, 2014
Maximum Pressure 1032 hPa 1019 hPa 1032 hPa, 2009 1003 hPa, 2014
Mean Pressure 1031 hPa 1016 hPa 1031 hPa, 2009 998 hPa, 2014
Mean Wind Speed 1.9 mph (-2.2) 3.8 mph (-0.3) 9.0 mph, 2018 1.9 mph, 2009
Maximum Wind Speed 6.6 mph 10.7 mph 20.3 mph, 2018 6.6 mph, 2009
Maximum Gust 9.5 mph 16.0 mph 35.7 mph, 2018 9.5 mph, 2009
Mean Wind Direction NW
Rainfall 0.0 mm 18.6 mm (68%) 40.7 mm, 2014
Maximum Hourly Rain n/a 6.4, 2014
Maximum 10-min Rain n/a 2.3, 2014
Maximum Rain Rate n/a 54, 2014
Minimum Dew Point 3.6 °C 6.1 °C 13.2 °C, 2018 3.3 °C, 2012
Maximum Dew Point 7.8 °C 11.8 °C 16.9 °C, 2018 6.9 °C, 2010
Mean Dew Point 5.8 °C 8.9 °C 15.3 °C, 2018 5.2 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.7 °C 9.6 °C 19.1 °C, 2018 5.1 °C, 2012
Day Maximum (09-21) 16.1 °C 15.8 °C 23.8 °C, 2018 11.4 °C, 2013
Max 10m Temp Rise n/a 0.0 °C 0.7, 2019 0.2, 2010
Max 1hr Temp Rise n/a 0.0 °C 2.1, 2012 0.5, 2011
Max 1hr Hum Rise n/a 0% 7, 2012 1, 2014
Max 10m Temp Fall n/a 0.0 °C 0.5, 2012 0.2, 2010
Max 1hr Temp Fall n/a 0.0 °C 1.5, 2012 0.5, 2010
Max 1hr Hum Fall n/a 0% 13, 2015 1, 2014
Max 10m Wind Speed n/a 5.8 mph 15.4, 2018 6, 2011
Minimum Feels-like 0.0 °C 00:00 7.1 °C 22.8 °C, 2018 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 13.7 °C 28.9 °C, 2018 0.0 °C, 2009
Mean Feels-like 0.0 °C 10.9 °C 25.3 °C, 2018 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.4 °C (+4.4) 7.1 °C (+0.8) 10.4 °C (+4.4), 2009 2.8 °C (-3.2), 2010
Humidity Range 40% 28% 40%, 2009 2%, 2014
Pressure Range 2 hPa 7 hPa 12 hPa, 2019 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 7.5 [77%]41 hrs (88%) [32%] 8 [82%], 2018 0 [0%], 2010
Wet Hours 019 hrs (91%) [6%] 21, 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
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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