Daily Report for 20th November 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.4 °C (+1.0) 23:47 4.6 °C (-0.9) 10.8 °C (+6.4), 2012 -0.8 °C (-5.2), 2013
Maximum Temperature 8.9 °C (-0.8) 06:41 10.2 °C (-0.3) 13.8 °C (+4.1), 2009 6.4 °C (-3.3), 2013
Mean Temperature 7.2 °C (+0.1) 7.4 °C (-0.6) 12.4 °C, 2009 2.6 °C, 2013
Minimum Humidity 76% 15:21 68% 96%, 2011 63%, 2015
Maximum Humidity 83% 01:32 81% 98%, 2010 83%, 2016
Mean Humidity 79% 76% 98%, 2011 78%, 2015
Minimum Pressure 969 hPa 06:36 1006 hPa 1023 hPa, 2014 969 hPa, 2016
Maximum Pressure 995 hPa 23:54 1015 hPa 1025 hPa, 2014 995 hPa, 2016
Mean Pressure 986 hPa 1011 hPa 1024 hPa, 2014 986 hPa, 2016
Mean Wind Speed 8.0 mph (+3.4) 6.0 mph (+1.4) 8.0 mph, 2016 0.8 mph, 2011
Maximum Wind Speed 21.9 mph 03:21 16.7 mph 21.9 mph, 2016 4.5 mph, 2011
Maximum Gust 37.1 mph 02:49 26.6 mph 37.1 mph, 2016 6.0 mph, 2011
Mean Wind Direction N
Rainfall 19.2 mm 66.4 mm (178%) 19.2 mm, 2016
Maximum Hourly Rain 3.5 mm 02:38 3.5 mm, 2016
Maximum 10-min Rain 1.2 mm 02:10 1.2 mm, 2013
Maximum Rain Rate 24 mm/h 06:11 36 mm/h, 2013
Minimum Dew Point 2.1 °C 20:14 0.8 °C 9.1 °C, 2012 -3.6 °C, 2013
Maximum Dew Point 5.7 °C 05:59 5.8 °C 12.7 °C, 2009 5.5 °C, 2013
Mean Dew Point 3.7 °C 3.4 °C 10.8 °C, 2012 0.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 6.0 °C * 22:36 5.3 °C 12.7 °C, 2009 -0.8 °C, 2013
Day Maximum (09-21) * 8.7 °C * 09:05 10.2 °C 13.8 °C, 2009 6.4 °C, 2013
Max 10m Temp Rise 0.4 °C 00:16 0.3 °C 0.4 °C, 2011 0.2 °C, 2010
Max 1hr Temp Rise 1.0 °C 03:41 1.3 °C 1.7 °C, 2013 0.3 °C, 2015
Max 1hr Hum Rise 2% 02:02 4% 8%, 2012 1%, 2011
Max 10m Temp Fall 0.3 °C 10:55 0.4 °C 1.8 °C, 2013 0.2 °C, 2014
Max 1hr Temp Fall 0.9 °C 11:16 1.2 °C 3.3 °C, 2013 0.8 °C, 2017
Max 1hr Hum Fall 3% 01:01 5% 10%, 2013 2%, 2010
Max 10m Wind Speed 17.4 mph 11:17 13.0 mph 17.4 mph, 2016 3.4 mph, 2011
Minimum Feels-like 0.3 °C 19:53 0.9 °C 11.8 °C, 2012 -5.9 °C, 2013
Maximum Feels-like 7.7 °C 07:02 9.9 °C 16.3 °C, 2009 4.6 °C, 2013
Mean Feels-like 2.8 °C 5.5 °C 13.8 °C, 2012 -0.2 °C, 2013
Air-frost Hrs 0 hrs 0.1 hrs 6 hrs, 2013 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.5 °C (-1.8) 5.6 °C (+0.6) 7.2 °C (+1.9), 2013 2.7 °C (-2.6), 2012
Humidity Range 7% 12% 26%, 2015 2%, 2011
Pressure Range 26 hPa 9 hPa 26 hPa, 2016 1 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]56 hrs (122%) [35%] 3 [39%], 2011 0 [0%], 2010
Wet Hours 10
[Mean rain rate: 1.9 mm/h]
52 hrs (124%) [11%] 10, 2016 0, 2010
Cloud Cover Overcast
Events None
Comments overnight, late eve Rain
Extra Comments
Issues harpenden loss 11-
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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