Daily Report for 21st November 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (+1.1) 00:18 4.6 °C (-0.8) 11.7 °C (+7.4), 2017 0.0 °C (-4.3), 2015
Maximum Temperature 12.9 °C (+3.3) 14:16 10.3 °C (-0.1) 15.0 °C (+5.4), 2009 5.1 °C (-4.5), 2015
Mean Temperature 9.6 °C (+2.2) 7.6 °C (-0.4) 12.7 °C, 2017 2.9 °C, 2015
Minimum Humidity 72% 15:22 68% 96%, 2011 55%, 2015
Maximum Humidity 80% 01:01 81% 98%, 2009 80%, 2016
Mean Humidity 77% 76% 98%, 2011 69%, 2015
Minimum Pressure 985 hPa 14:09 1005 hPa 1014 hPa, 2011 985 hPa, 2016
Maximum Pressure 994 hPa 00:01 1014 hPa 1023 hPa, 2014 994 hPa, 2016
Mean Pressure 988 hPa 1010 hPa 1017 hPa, 2014 988 hPa, 2016
Mean Wind Speed 2.0 mph (-2.6) 5.8 mph (+1.2) 8.0 mph, 2017 2.0 mph, 2016
Maximum Wind Speed 16.2 mph 13:24 16.7 mph 20.4 mph, 2012 10.0 mph, 2011
Maximum Gust 24.0 mph 13:24 26.5 mph 35.1 mph, 2012 13.2 mph, 2011
Mean Wind Direction S
Rainfall 15.0 mm 81.4 mm (208%) 15.0 mm, 2016
Maximum Hourly Rain 3.7 mm 13:50 4.4 mm, 2009
Maximum 10-min Rain 2.1 mm 17:59 2.1 mm, 2016
Maximum Rain Rate 54 mm/h 21:58 54 mm/h, 2016
Minimum Dew Point 2.2 °C 00:18 0.9 °C 9.3 °C, 2017 -7.4 °C, 2015
Maximum Dew Point 9.0 °C 14:03 6.0 °C 13.2 °C, 2009 3.5 °C, 2015
Mean Dew Point 5.7 °C 3.5 °C 11.3 °C, 2009 -2.5 °C, 2015
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 5.4 °C 00:18 5.3 °C 11.7 °C, 2017 1.7 °C, 2015
Day Maximum (09-21) 12.9 °C 14:16 10.3 °C 15.0 °C, 2009 5.1 °C, 2015
Max 10m Temp Rise 0.4 °C 09:39 0.3 °C 0.6 °C, 2015 0.1 °C, 2010
Max 1hr Temp Rise 1.6 °C 10:32 1.3 °C 2.6 °C, 2015 0.4 °C, 2010
Max 1hr Hum Rise 3% 22:05 4% 8%, 2013 1%, 2011
Max 10m Temp Fall 0.3 °C 15:00 0.4 °C 1.1 °C, 2012 0.2 °C, 2010
Max 1hr Temp Fall 0.7 °C 15:15 1.2 °C 2.9 °C, 2012 0.5 °C, 2010
Max 1hr Hum Fall 5% 15:04 5% 15%, 2015 2%, 2014
Max 10m Wind Speed 11.0 mph 14:38 12.9 mph 15.7 mph, 2012 6.8 mph, 2011
Minimum Feels-like 3.2 °C 00:00 1.0 °C 12.9 °C, 2017 -4.3 °C, 2015
Maximum Feels-like 13.7 °C 14:13 10.1 °C 17.6 °C, 2009 3.0 °C, 2015
Mean Feels-like 8.7 °C 5.7 °C 14.2 °C, 2009 -1.0 °C, 2015
Air-frost Hrs 0 hrs 0.1 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.5 °C (+2.1) 5.7 °C (+0.7) 7.5 °C (+2.1), 2016 2.1 °C (-3.2), 2010
Humidity Range 8% 12% 38%, 2015 2%, 2011
Pressure Range 9 hPa 9 hPa 18 hPa, 2013 3 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.3 [4%]57 hrs (117%) [34%] 4.2 [55%], 2015 0 [0%], 2012
Wet Hours 10
[Mean rain rate: 1.5 mm/h]
62 hrs (141%) [12%] 10, 2016 0, 2010
Cloud Cover am: Overcast
pm: Mostly Cloudy transitioned to Partly Cloudy
Events None
Comments o.night Rain; Showers throughout
Extra Comments
Issues T/H sensor loss 07-09; harpenden data down til 13
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.
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