Daily Report for 16th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.9 °C (-0.1) 9.1 °C (-0.4) 13.8 °C (+4.8), 2018 3.3 °C (-5.7), 2011
Maximum Temperature 13.8 °C (-1.1) 15.9 °C (+0.2) 22.1 °C (+7.2), 2017 12.5 °C (-2.4), 2010
Mean Temperature 11.7 °C (-0.6) 12.2 °C (-0.1) 16.4 °C, 2017 9.1 °C, 2010
Minimum Humidity 54% 62% 85%, 2013 47%, 2012
Maximum Humidity 94% 91% 98%, 2013 84%, 2016
Mean Humidity 75% 79% 95%, 2013 70%, 2012
Minimum Pressure 1031 hPa 1016 hPa 1031 hPa, 2009 995 hPa, 2012
Maximum Pressure 1033 hPa 1022 hPa 1033 hPa, 2009 1004 hPa, 2012
Mean Pressure 1032 hPa 1019 hPa 1032 hPa, 2009 1000 hPa, 2012
Mean Wind Speed 2.2 mph (-1.9) 3.4 mph (-0.7) 7.3 mph, 2012 2.1 mph, 2011
Maximum Wind Speed 7.3 mph 9.9 mph 22.5 mph, 2012 6.7 mph, 2011
Maximum Gust 10.2 mph 14.7 mph 31.1 mph, 2017 9.8 mph, 2011
Mean Wind Direction N
Rainfall trace 19.0 mm (57%) 10.6, 2016
Maximum Hourly Rain n/a 7.3, 2016
Maximum 10-min Rain n/a 5.8, 2016
Maximum Rain Rate n/a 120, 2016
Minimum Dew Point 3.8 °C 5.7 °C 11.2 °C, 2018 1.1 °C, 2010
Maximum Dew Point 10.7 °C 11.4 °C 16.4 °C, 2017 8.8 °C, 2010
Mean Dew Point 7.0 °C 8.6 °C 13.8 °C, 2018 6.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 10.7 °C * 9.7 °C 13.2 °C, 2018 3.3 °C, 2011
Day Maximum (09-21) 13.8 °C 15.6 °C 22.1 °C, 2017 12.5 °C, 2010
Max 10m Temp Rise n/a 0.0 °C 1, 2011 0.2, 2015
Max 1hr Temp Rise n/a 0.0 °C 4.3, 2011 0.7, 2015
Max 1hr Hum Rise n/a 0% 9, 2012 2, 2013
Max 10m Temp Fall n/a 0.0 °C 0.5, 2010 0.2, 2015
Max 1hr Temp Fall n/a 0.0 °C 1.8, 2012 0.6, 2015
Max 1hr Hum Fall n/a 0% 18, 2017 4, 2015
Max 10m Wind Speed n/a 4.7 mph 15.9, 2016 5, 2011
Minimum Feels-like 0.0 °C 00:00 5.8 °C 15.9 °C, 2018 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 11.1 °C 26.6 °C, 2017 0.0 °C, 2009
Mean Feels-like 0.0 °C 8.8 °C 19.3 °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 4.9 °C (-0.9) 6.8 °C (+0.6) 12.6 °C (+6.8), 2011 2.5 °C (-3.3), 2015
Humidity Range 40% 29% 48%, 2012 13%, 2013
Pressure Range 2 hPa 6 hPa 10 hPa, 2010 1 hPa, 2015
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 2 [21%]47 hrs (81%) [29%] 7 [73%], 2012 0 [0%], 2015
Wet Hours 0.520 hrs (80%) [5.3%] 4, 2013 0, 2011
Cloud Cover not available
Events None
Comments 05-06 SLight Rain/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
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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