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 3.2 °C, 2018
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 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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Webcam Summary of Cloud Conditions

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