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 4.9 °C (-4.8), 2018
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 2.6 °C, 2018
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 4.8 °C, 2018
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 0.7 °C, 2018
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 3.2 °C, 2018
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%] 14, 2018 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 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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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