Daily Report for 4th October 2009

<<Previous Day
Reset
Next Day>>
Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.8 °C (-1.1) 9.6 °C (-0.3) 15.8 °C (+5.9), 2011 7.2 °C (-2.7), 2012
Maximum Temperature 15.9 °C (-0.4) 16.2 °C (-0.1) 20.4 °C (+4.1), 2013 15.1 °C (-1.2), 2012
Mean Temperature 12.0 °C (-0.7) 12.9 °C (-0.2) 17.7 °C, 2013 11.4 °C, 2012
Minimum Humidity 50% 53% 88%, 2010 50%, 2009
Maximum Humidity 87% 84% 98%, 2010 81%, 2011
Mean Humidity 69% 70% 95%, 2010 69%, 2009
Minimum Pressure 1009 hPa 1012 hPa 1030 hPa, 2016 998 hPa, 2010
Maximum Pressure 1014 hPa 1018 hPa 1032 hPa, 2016 1000 hPa, 2010
Mean Pressure 1012 hPa 1015 hPa 1031 hPa, 2016 999 hPa, 2010
Mean Wind Speed 4.1 mph (+0.0) 4.5 mph (+0.4) 7.2 mph, 2017 1.9 mph, 2010
Maximum Wind Speed 10.6 mph 12.1 mph 18.7 mph, 2016 7.1 mph, 2010
Maximum Gust 15.8 mph 19.0 mph 30.6 mph, 2016 10.5 mph, 2010
Mean Wind Direction W
Rainfall 0.0 mm 1.4 mm (17%) 5.9 mm, 2014
Maximum Hourly Rain n/a 2.3, 2014
Maximum 10-min Rain n/a 0.8, 2014
Maximum Rain Rate n/a 18, 2014
Minimum Dew Point 4.0 °C 4.9 °C 12.8 °C, 2013 4.0 °C, 2009
Maximum Dew Point 11.0 °C 10.7 °C 17.4 °C, 2013 9.0 °C, 2012
Mean Dew Point 7.0 °C 7.5 °C 15.2 °C, 2013 7.0 °C, 2009
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 8.8 °C 10.3 °C 16.3 °C, 2013 7.2 °C, 2012
Day Maximum (09-21) 15.9 °C 16.2 °C 20.4 °C, 2013 15.1 °C, 2012
Max 10m Temp Rise n/a 0.0 °C 0.6, 2012 0.3, 2010
Max 1hr Temp Rise n/a 0.0 °C 3.1, 2015 1.1, 2010
Max 1hr Hum Rise n/a 0% 15, 2014 3, 2010
Max 10m Temp Fall n/a 0.0 °C 0.9, 2014 0.3, 2010
Max 1hr Temp Fall n/a 0.0 °C 2.8, 2014 0.9, 2012
Max 1hr Hum Fall n/a 0% 16, 2012 3, 2010
Max 10m Wind Speed n/a 5.0 mph 15, 2016 5.2, 2010
Minimum Feels-like 0.0 °C 00:00 7.4 °C 18.6 °C, 2013 0.0 °C, 2009
Maximum Feels-like 0.0 °C 00:00 11.9 °C 24.5 °C, 2013 0.0 °C, 2009
Mean Feels-like 0.0 °C 10.0 °C 21.8 °C, 2013 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 7.1 °C (+0.7) 6.7 °C (+0.2) 10.4 °C (+4.0), 2014 2.9 °C (-3.5), 2011
Humidity Range 37% 32% 40%, 2012 10%, 2010
Pressure Range 5 hPa 6 hPa 11 hPa, 2014 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 4 [39%]15 hrs (99%) [36%] 9 [87%], 2016 0.5 [5%], 2010
Wet Hours 00.5 hrs (8%) [0.5%] 5, 2010 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.
View monthly summary

Daily Graph of Conditions

daygraph daygraph 2 daygraph-wdir

Webcam Summary of Cloud Conditions


Webcam summary not available for this day

Wind rose