Daily Report for 3rd October 2009

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 11.7 °C (+1.8) 12:24 9.9 °C (-0.1) 16.2 °C (+6.3), 2011 3.1 °C (-6.8), 2019
Maximum Temperature 16.0 °C (-0.4) 00:25 16.4 °C (-0.0) 25.3 °C (+8.9), 2011 13.3 °C (-3.1), 2019
Mean Temperature 13.7 °C (+0.7) 13.3 °C (-0.1) 19.9 °C, 2011 8.7 °C, 2019
Minimum Humidity 60% 00:04 54% 89%, 2013 35%, 2011
Maximum Humidity 89% 12:38 84% 98%, 2010 78%, 2011
Mean Humidity 75% 70% 94%, 2013 59%, 2011
Minimum Pressure 1006 hPa 11:39 1013 hPa 1025 hPa, 2016 994 hPa, 2010
Maximum Pressure 1016 hPa 00:48 1019 hPa 1031 hPa, 2016 999 hPa, 2010
Mean Pressure 1011 hPa 1016 hPa 1029 hPa, 2016 996 hPa, 2010
Mean Wind Speed 6.0 mph (+1.9) 4.6 mph (+0.5) 6.3 mph, 2011 0.8 mph, 2015
Maximum Wind Speed 17.2 mph 12.6 mph 17.6 mph, 2010 5.6 mph, 2015
Maximum Gust 28.9 mph 00:14 20.1 mph 28.9 mph, 2009 8.1 mph, 2015
Mean Wind Direction SW
Rainfall 1.4 mm 1.4 mm (22%) 10.1 mm, 2012
Maximum Hourly Rain 1.4 mm 7.7 mm, 2012
Maximum 10-min Rain n/a 5.4, 2012
Maximum Rain Rate n/a 76.4, 2012
Minimum Dew Point 8.2 °C 00:04 5.3 °C 12.7 °C, 2013 2.1 °C, 2019
Maximum Dew Point 10.8 °C 12:38 10.6 °C 16.8 °C, 2013 8.8 °C, 2017
Mean Dew Point 9.2 °C 7.7 °C 14.7 °C, 2013 5.4 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 11.7 °C 10.8 °C 16.2 °C, 2011 3.1 °C, 2019
Day Maximum (09-21) 16.0 °C 16.4 °C 25.3 °C, 2011 13.3 °C, 2019
Max 10m Temp Rise n/a 00:11 0.0 °C 0.9, 2011 0.4, 2010
Max 1hr Temp Rise n/a 01:01 0.0 °C 3.5, 2016 1.4, 2018
Max 1hr Hum Rise n/a 02:07 0% 13, 2011 2, 2013
Max 10m Temp Fall n/a 00:58 0.0 °C 1.4, 2012 0.2, 2010
Max 1hr Temp Fall n/a 01:38 0.0 °C 3.2, 2016 0.7, 2013
Max 1hr Hum Fall n/a 01:19 0% 19, 2019 4, 2013
Max 10m Wind Speed 5.8 mph 01:36 6.7 mph 11.6 mph, 2010 4.2 mph, 2015
Minimum Feels-like 13.1 °C 01:38 9.8 °C 17.9 °C, 2011 0.2 °C, 2019
Maximum Feels-like 13.6 °C 00:30 15.9 °C 27.0 °C, 2011 13.6 °C, 2009
Mean Feels-like 13.4 °C 13.4 °C 21.8 °C, 2011 8.9 °C, 2019
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.3 °C (-2.2) 6.5 °C (+0.0) 11.8 °C (+5.3), 2016 4.3 °C (-2.2), 2009
Humidity Range 29% 30% 43%, 2011 9%, 2013
Pressure Range 10 hPa 7 hPa 17 hPa, 2019 3 hPa, 2012
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.2 [2%]11 hrs (96%) [34%] 10.2 [98%], 2016 0.2 [2%], 2009
Wet Hours 0.5
[Mean rain rate: 2.8 mm/h]
0.5 hrs (11%) [0.7%] 4, 2010 0, 2011
Cloud Cover not available
Events None
Comments 2130-22 Heavy 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
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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