Daily Report for 20th October 2009

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.6 °C (-3.1) 8.2 °C (-1.1) 13.1 °C (+4.4), 2014 -0.4 °C (-9.1), 2010
Maximum Temperature 13.3 °C (-1.0) 15.2 °C (-0.2) 16.8 °C (+2.5), 2013 7.9 °C (-6.4), 2010
Mean Temperature 9.6 °C (-2.1) 11.5 °C (-0.7) 14.3 °C, 2014 4.6 °C, 2010
Minimum Humidity 70% 62% 76%, 2013 46%, 2010
Maximum Humidity 89% 91% 98%, 2012 83%, 2016
Mean Humidity 80% 78% 92%, 2012 70%, 2011
Minimum Pressure 995 hPa 1015 hPa 1025 hPa, 2015 995 hPa, 2009
Maximum Pressure 1005 hPa 1022 hPa 1028 hPa, 2011 1005 hPa, 2009
Mean Pressure 1000 hPa 1018 hPa 1026 hPa, 2015 1000 hPa, 2009
Mean Wind Speed 4.8 mph (+0.7) 3.3 mph (-0.8) 8.1 mph, 2017 1.7 mph, 2015
Maximum Wind Speed 12.0 mph 9.6 mph 16.5 mph, 2017 6.0 mph, 2015
Maximum Gust 17.9 mph 14.2 mph 26.5 mph, 2017 8.7 mph, 2012
Mean Wind Direction SE
Rainfall 0.3 mm 19.3 mm (46%) 13.8 mm, 2013
Maximum Hourly Rain n/a 8.5, 2013
Maximum 10-min Rain n/a 4.7, 2013
Maximum Rain Rate n/a 108, 2013
Minimum Dew Point 2.0 °C 5.0 °C 10.6 °C, 2013 -4.4 °C, 2010
Maximum Dew Point 9.0 °C 10.5 °C 13.3 °C, 2013 3.4 °C, 2010
Mean Dew Point 6.0 °C 7.8 °C 12.3 °C, 2013 -0.6 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.6 °C 8.7 °C 13.4 °C, 2013 2.7 °C, 2010
Day Maximum (09-21) 13.3 °C 15.0 °C 16.8 °C, 2013 7.9 °C, 2010
Max 10m Temp Rise n/a 0.0 °C 0.6, 2015 0.3, 2012
Max 1hr Temp Rise n/a 0.0 °C 2.1, 2011 0.9, 2017
Max 1hr Hum Rise n/a 0% 10, 2010 5, 2016
Max 10m Temp Fall n/a 0.0 °C 1.1, 2013 0.2, 2012
Max 1hr Temp Fall n/a 0.0 °C 2.9, 2013 0.8, 2012
Max 1hr Hum Fall n/a 0% 11, 2010 6, 2016
Max 10m Wind Speed n/a 3.8 mph 11.9, 2017 4.6, 2015
Minimum Feels-like 0.0 °C 00:00 4.6 °C 14.6 °C, 2014 -3.0 °C, 2010
Maximum Feels-like 0.0 °C 00:00 8.9 °C 19.6 °C, 2013 0.0 °C, 2009
Mean Feels-like 0.0 °C 7.1 °C 16.3 °C, 2013 0.0 °C, 2009
Air-frost Hrs 0 hrs 0 hrs 0.7 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.7 °C (+2.0) 7.0 °C (+0.9) 8.3 °C (+2.6), 2010 2.4 °C (-3.3), 2017
Humidity Range 19% 29% 43%, 2010 16%, 2016
Pressure Range 10 hPa 7 hPa 12 hPa, 2017 3 hPa, 2013
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]50 hrs (71%) [25%] 9.2 [99%], 2010 0 [0%], 2009
Wet Hours 0.5
[Mean rain rate: 0.6 mm/h]
21 hrs (66%) [4.3%] 4.5, 2012 0, 2010
Cloud Cover not available
Events None
Comments 2130 Light Shower
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.
View monthly summary

Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day