Daily Report for 15th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 9.1 °C (+0.0) 9.1 °C (-0.4) 11.9 °C (+2.8), 2014 3.1 °C (-6.0), 2012
Maximum Temperature 16.3 °C (+1.3) 16.0 °C (+0.3) 19.0 °C (+4.0), 2017 12.2 °C (-2.8), 2015
Mean Temperature 12.1 °C (+0.7) 12.3 °C (-0.1) 14.9 °C, 2017 8.9 °C, 2012
Minimum Humidity 52% 63% 95%, 2018 49%, 2011
Maximum Humidity 87% 91% 98%, 2017 85%, 2016
Mean Humidity 71% 79% 96%, 2018 71%, 2009
Minimum Pressure 1031 hPa 1015 hPa 1031 hPa, 2009 999 hPa, 2012
Maximum Pressure 1034 hPa 1021 hPa 1034 hPa, 2009 1004 hPa, 2012
Mean Pressure 1032 hPa 1018 hPa 1032 hPa, 2009 1002 hPa, 2012
Mean Wind Speed 2.2 mph (-1.9) 3.5 mph (-0.6) 4.5 mph, 2019 1.6 mph, 2011
Maximum Wind Speed 7.3 mph 10.1 mph 13.2 mph, 2017 6.9 mph, 2011
Maximum Gust 10.7 mph 14.9 mph 23.0 mph, 2019 10.2 mph, 2011
Mean Wind Direction W
Rainfall 0.0 mm 18.9 mm (60%) 10.3 mm, 2018
Maximum Hourly Rain n/a 7.2, 2016
Maximum 10-min Rain n/a 2.2, 2016
Maximum Rain Rate n/a 48, 2016
Minimum Dew Point 5.0 °C 5.9 °C 11.3 °C, 2014 1.8 °C, 2012
Maximum Dew Point 9.0 °C 11.5 °C 14.7 °C, 2017 8.4 °C, 2011
Mean Dew Point 6.5 °C 8.7 °C 12.7 °C, 2017 5.0 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 9.1 °C 9.6 °C 11.9 °C, 2014 3.1 °C, 2012
Day Maximum (09-21) 16.3 °C 15.7 °C 19.0 °C, 2017 12.2 °C, 2015
Max 10m Temp Rise n/a 0.0 °C 0.8, 2011 0.2, 2010
Max 1hr Temp Rise n/a 0.0 °C 3.3, 2011 0.5, 2018
Max 1hr Hum Rise n/a 0% 10, 2016 1, 2018
Max 10m Temp Fall n/a 0.0 °C 0.6, 2012 0.1, 2015
Max 1hr Temp Fall n/a 0.0 °C 2.2, 2012 0.3, 2018
Max 1hr Hum Fall n/a 0% 13, 2012 1, 2018
Max 10m Wind Speed n/a 5.0 mph 10.6, 2016 4.4, 2011
Minimum Feels-like 0.0 °C 00:00 6.2 °C 13.8 °C, 2014 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 11.8 °C 22.6 °C, 2017 0.0 °C, 2009
Mean Feels-like 0.0 °C 9.4 °C 17.6 °C, 2017 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 7.2 °C (+1.3) 6.9 °C (+0.7) 10.4 °C (+4.5), 2011 2.9 °C (-3.0), 2015
Humidity Range 35% 28% 43%, 2011 2%, 2018
Pressure Range 3 hPa 7 hPa 9 hPa, 2016 2 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [31%]45 hrs (83%) [30%] 9.6 [100%], 2011 0 [0%], 2010
Wet Hours 020 hrs (84%) [5.5%] 6, 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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Daily Graph of Conditions

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