Daily Report for 19th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.7 °C (-4.1) 8.4 °C (-1.0) 14.0 °C (+5.2), 2014 4.7 °C (-4.1), 2009
Maximum Temperature 12.1 °C (-2.4) 15.3 °C (-0.2) 18.8 °C (+4.3), 2014 11.7 °C (-2.8), 2011
Mean Temperature 8.1 °C (-3.2) 11.6 °C (-0.6) 16.8 °C, 2014 7.8 °C, 2011
Minimum Humidity 61% 62% 86%, 2017 45%, 2011
Maximum Humidity 92% 91% 98%, 2012 78%, 2016
Mean Humidity 79% 78% 94%, 2012 70%, 2011
Minimum Pressure 1005 hPa 1016 hPa 1023 hPa, 2015 998 hPa, 2017
Maximum Pressure 1020 hPa 1023 hPa 1026 hPa, 2015 1009 hPa, 2012
Mean Pressure 1012 hPa 1019 hPa 1025 hPa, 2015 1004 hPa, 2017
Mean Wind Speed 2.2 mph (-1.9) 3.3 mph (-0.8) 7.6 mph, 2014 2.2 mph, 2009
Maximum Wind Speed 7.3 mph 9.5 mph 18.1 mph, 2014 7.3 mph, 2009
Maximum Gust 10.5 mph 14.1 mph 27.4 mph, 2016 10.5 mph, 2009
Mean Wind Direction S
Rainfall 0.0 mm 19.0 mm (48%) 6.8 mm, 2010
Maximum Hourly Rain n/a 2.8, 2010
Maximum 10-min Rain n/a 1.8, 2017
Maximum Rain Rate n/a 24, 2017
Minimum Dew Point 3.0 °C 5.2 °C 12.3 °C, 2017 -0.2 °C, 2011
Maximum Dew Point 9.0 °C 10.6 °C 16.3 °C, 2014 5.0 °C, 2011
Mean Dew Point 5.5 °C 7.9 °C 14.1 °C, 2017 2.5 °C, 2011
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.7 °C 8.9 °C 15.8 °C, 2014 4.7 °C, 2009
Day Maximum (09-21) 12.1 °C 15.0 °C 18.8 °C, 2014 11.7 °C, 2011
Max 10m Temp Rise n/a 0.0 °C 0.5, 2010 0.2, 2012
Max 1hr Temp Rise n/a 0.0 °C 2.2, 2011 0.7, 2015
Max 1hr Hum Rise n/a 0% 13, 2010 3, 2015
Max 10m Temp Fall n/a 0.0 °C 0.9, 2010 0.2, 2012
Max 1hr Temp Fall n/a 0.0 °C 2.6, 2010 0.8, 2012
Max 1hr Hum Fall n/a 0% 11, 2014 2, 2012
Max 10m Wind Speed n/a 4.0 mph 13.8, 2014 5.1, 2015
Minimum Feels-like 0.0 °C 00:00 4.9 °C 16.2 °C, 2017 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 9.3 °C 22.3 °C, 2014 0.0 °C, 2009
Mean Feels-like 0.0 °C 7.4 °C 20.0 °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 7.4 °C (+1.7) 6.9 °C (+0.8) 7.4 °C (+1.7), 2010 2.0 °C (-3.7), 2012
Humidity Range 31% 29% 40%, 2011 12%, 2017
Pressure Range 15 hPa 7 hPa 15 hPa, 2009 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]50 hrs (74%) [27%] 7 [75%], 2011 0 [0%], 2009
Wet Hours 020 hrs (68%) [4.5%] 8, 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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