Daily Report for 21st October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 10.5 °C (+2.0) 11:19 8.3 °C (-0.9) 12.8 °C (+4.3), 2013 0.0 °C (-8.5), 2010
Maximum Temperature 13.7 °C (-0.5) 15:42 15.1 °C (-0.2) 17.4 °C (+3.2), 2018 11.4 °C (-2.8), 2010
Mean Temperature 12.0 °C (+0.7) 11.5 °C (-0.6) 15.4 °C, 2013 6.3 °C, 2010
Minimum Humidity 88% 11:19 63% 94%, 2012 47%, 2014
Maximum Humidity 96% 22:43 91% 98%, 2012 79%, 2011
Mean Humidity 93% 79% 96%, 2012 69%, 2011
Minimum Pressure 994 hPa 18:29 1014 hPa 1026 hPa, 2018 994 hPa, 2009
Maximum Pressure 996 hPa 11:19 1021 hPa 1031 hPa, 2018 996 hPa, 2009
Mean Pressure 995 hPa 1017 hPa 1029 hPa, 2018 995 hPa, 2009
Mean Wind Speed 4.8 mph (+0.7) 3.4 mph (-0.7) 10.2 mph, 2017 2.5 mph, 2018
Maximum Wind Speed 11.8 mph 9.7 mph 23.8 mph, 2017 9.7 mph, 2015
Maximum Gust 17.4 mph 16:14 14.4 mph 38.0 mph, 2017 14.3 mph, 2015
Mean Wind Direction SE
Rainfall 1.6 mm 20.9 mm (47%) 8.5 mm, 2015
Maximum Hourly Rain 1.1 mm 2.4 mm, 2015
Maximum 10-min Rain n/a 1, 2014
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point 9.7 °C 11:19 5.3 °C 12.1 °C, 2013 -3.4 °C, 2010
Maximum Dew Point 12.9 °C 15:42 10.6 °C 15.2 °C, 2013 5.1 °C, 2010
Mean Dew Point 10.6 °C 7.9 °C 13.6 °C, 2013 1.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 11.7 °C * 8.9 °C 12.9 °C, 2014 -0.4 °C, 2010
Day Maximum (09-21) 13.7 °C 14.9 °C 17.4 °C, 2018 11.4 °C, 2010
Max 10m Temp Rise n/a 15:37 0.0 °C 0.7, 2010 0.2, 2015
Max 1hr Temp Rise n/a 15:37 0.0 °C 3.3, 2010 0.6, 2015
Max 1hr Hum Rise n/a 15:37 0% 17, 2014 2, 2012
Max 10m Temp Fall n/a 20:01 0.0 °C 1.6, 2014 0.1, 2013
Max 1hr Temp Fall n/a 20:42 0.0 °C 2.7, 2014 0.2, 2015
Max 1hr Hum Fall n/a 16:44 0% 18, 2014 1, 2015
Max 10m Wind Speed 4.5 mph 15:52 3.8 mph 17.3 mph, 2017 4.5 mph, 2009
Minimum Feels-like 8.7 °C 00:01 4.8 °C 15.2 °C, 2013 -2.9 °C, 2010
Maximum Feels-like 15.7 °C 15:37 9.2 °C 20.8 °C, 2013 11.4 °C, 2010
Mean Feels-like 10.7 °C 7.2 °C 18.5 °C, 2013 5.2 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0.0 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.2 °C (-2.5) 6.8 °C (+0.7) 11.4 °C (+5.8), 2010 2.4 °C (-3.2), 2019
Humidity Range 8% 28% 46%, 2014 4%, 2012
Pressure Range 2 hPa 7 hPa 19 hPa, 2014 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]50 hrs (68%) [24%] 9.3 [100%], 2018 0 [0%], 2009
Wet Hours 2
[Mean rain rate: 0.8 mm/h]
23 hrs (69%) [4.5%] 11, 2015 0, 2010
Cloud Cover not available
Events None
Comments 00-02 Light Rain
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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