Daily Report for 18th October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.8 °C (-6.1) 8.6 °C (-0.8) 16.4 °C (+7.5), 2014 2.8 °C (-6.1), 2009
Maximum Temperature 12.4 °C (-2.2) 15.5 °C (-0.1) 19.5 °C (+4.9), 2014 12.4 °C (-2.2), 2009
Mean Temperature 7.1 °C (-4.1) 11.8 °C (-0.4) 17.8 °C, 2014 7.1 °C, 2009
Minimum Humidity 54% 62% 78%, 2017 42%, 2011
Maximum Humidity 86% 91% 98%, 2013 84%, 2016
Mean Humidity 74% 78% 90%, 2017 66%, 2011
Minimum Pressure 1020 hPa 1017 hPa 1025 hPa, 2018 998 hPa, 2019
Maximum Pressure 1028 hPa 1023 hPa 1028 hPa, 2018 1003 hPa, 2019
Mean Pressure 1024 hPa 1020 hPa 1027 hPa, 2018 1000 hPa, 2019
Mean Wind Speed 1.2 mph (-2.9) 3.3 mph (-0.8) 9.0 mph, 2016 1.2 mph, 2009
Maximum Wind Speed 5.5 mph 9.6 mph 23.1 mph, 2016 5.5 mph, 2009
Maximum Gust 7.5 mph 14.3 mph 35.5 mph, 2016 7.5 mph, 2009
Mean Wind Direction W
Rainfall 0.0 mm 19.0 mm (50%) 7.5 mm, 2019
Maximum Hourly Rain n/a 4, 2017
Maximum 10-min Rain n/a 2.4, 2019
Maximum Rain Rate n/a 66, 2019
Minimum Dew Point 1.0 °C 5.3 °C 14.8 °C, 2014 -0.5 °C, 2011
Maximum Dew Point 4.0 °C 10.6 °C 15.9 °C, 2014 4.0 °C, 2009
Mean Dew Point 2.5 °C 8.0 °C 15.4 °C, 2014 2.5 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.8 °C 9.1 °C 16.2 °C, 2014 2.8 °C, 2009
Day Maximum (09-21) 12.4 °C 15.2 °C 19.5 °C, 2014 12.4 °C, 2009
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, 2019 0.8, 2016
Max 1hr Hum Rise n/a 0% 10, 2011 4, 2010
Max 10m Temp Fall n/a 0.0 °C 0.8, 2019 0.1, 2017
Max 1hr Temp Fall n/a 0.0 °C 1.6, 2019 0.2, 2017
Max 1hr Hum Fall n/a 0% 14, 2016 5, 2014
Max 10m Wind Speed n/a 4.2 mph 18.2, 2016 5.9, 2015
Minimum Feels-like 0.0 °C 00:00 5.1 °C 20.2 °C, 2014 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 9.9 °C 23.8 °C, 2014 0.0 °C, 2009
Mean Feels-like 0.0 °C 7.8 °C 22.0 °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 9.6 °C (+3.9) 6.9 °C (+0.8) 10.5 °C (+4.8), 2010 3.1 °C (-2.6), 2014
Humidity Range 32% 29% 45%, 2011 16%, 2014
Pressure Range 8 hPa 6 hPa 10 hPa, 2010 3 hPa, 2018
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3 [32%]50 hrs (78%) [28%] 8 [85%], 2011 0 [0%], 2017
Wet Hours 020 hrs (71%) [4.7%] 6, 2017 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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