Daily Report for 17th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 6.1 °C (-2.8) 8.9 °C (-0.5) 13.6 °C (+4.7), 2014 3.5 °C (-5.4), 2010
Maximum Temperature 12.2 °C (-2.5) 15.6 °C (+0.1) 18.7 °C (+4.0), 2014 12.0 °C (-2.7), 2010
Mean Temperature 9.4 °C (-2.7) 12.1 °C (-0.2) 16.0 °C, 2014 7.6 °C, 2010
Minimum Humidity 58% 62% 83%, 2018 49%, 2010
Maximum Humidity 87% 91% 96%, 2012 84%, 2010
Mean Humidity 73% 79% 90%, 2018 68%, 2010
Minimum Pressure 1028 hPa 1017 hPa 1028 hPa, 2009 993 hPa, 2012
Maximum Pressure 1033 hPa 1023 hPa 1033 hPa, 2009 1003 hPa, 2012
Mean Pressure 1030 hPa 1020 hPa 1030 hPa, 2009 997 hPa, 2012
Mean Wind Speed 3.7 mph (-0.4) 3.4 mph (-0.7) 7.2 mph, 2016 2.1 mph, 2018
Maximum Wind Speed 10.0 mph 9.9 mph 18.5 mph, 2012 7.6 mph, 2010
Maximum Gust 14.6 mph 14.6 mph 29.7 mph, 2011 10.9 mph, 2010
Mean Wind Direction N
Rainfall 0.0 mm 19.0 mm (53%) 9.5 mm, 2012
Maximum Hourly Rain n/a 4, 2012
Maximum 10-min Rain n/a 1.7, 2012
Maximum Rain Rate n/a 30, 2012
Minimum Dew Point 3.0 °C 5.6 °C 13.0 °C, 2014 0.0 °C, 2010
Maximum Dew Point 5.0 °C 11.0 °C 15.7 °C, 2014 5.0 °C, 2009
Mean Dew Point 4.6 °C 8.3 °C 14.1 °C, 2014 1.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 6.1 °C 9.5 °C 13.6 °C, 2014 5.5 °C, 2010
Day Maximum (09-21) 12.2 °C 15.4 °C 18.7 °C, 2014 12.0 °C, 2010
Max 10m Temp Rise n/a 0.0 °C 0.7, 2010 0.2, 2018
Max 1hr Temp Rise n/a 0.0 °C 3.4, 2011 0.7, 2018
Max 1hr Hum Rise n/a 0% 16, 2012 3, 2018
Max 10m Temp Fall n/a 0.0 °C 1, 2012 0.2, 2014
Max 1hr Temp Fall n/a 0.0 °C 2.7, 2010 0.6, 2015
Max 1hr Hum Fall n/a 0% 13, 2012 3, 2018
Max 10m Wind Speed n/a 4.4 mph 14.2, 2017 6, 2010
Minimum Feels-like 0.0 °C 00:00 5.4 °C 16.4 °C, 2014 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 10.4 °C 22.4 °C, 2014 0.0 °C, 2009
Mean Feels-like 0.0 °C 8.3 °C 19.4 °C, 2014 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 6.1 °C (+0.3) 6.7 °C (+0.6) 8.5 °C (+2.7), 2010 2.6 °C (-3.2), 2015
Humidity Range 29% 29% 40%, 2012 12%, 2018
Pressure Range 5 hPa 6 hPa 13 hPa, 2011 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [5%]47 hrs (78%) [28%] 6 [63%], 2010 0 [0%], 2018
Wet Hours 020 hrs (76%) [5%] 5, 2012 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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