Daily Report for 20th February 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 8.6 °C (+6.5) 07:00 3.6 °C (+1.5) 10.1 °C (+8.0), 2017 -2.0 °C (-4.1), 2012
Maximum Temperature 12.3 °C (+4.7) 23:51 8.7 °C (+1.4) 17.1 °C (+9.5), 2017 4.2 °C (-3.4), 2013
Mean Temperature 10.5 °C (+5.6) 6.4 °C (+1.4) 12.6 °C, 2017 1.0 °C, 2010
Minimum Humidity 65% 11:50 60% 93%, 2011 44%, 2012
Maximum Humidity 92% 01:12 88% 98%, 2011 78%, 2012
Mean Humidity 85% 76% 95%, 2011 63%, 2012
Minimum Pressure 1007 hPa 10:46 1001 hPa 1030 hPa, 2012 995 hPa, 2010
Maximum Pressure 1010 hPa 14:54 1013 hPa 1033 hPa, 2012 998 hPa, 2010
Mean Pressure 1009 hPa 1007 hPa 1032 hPa, 2012 996 hPa, 2010
Mean Wind Speed 9.4 mph (+4.3) 6.9 mph (+1.8) 9.4 mph, 2016 2.6 mph, 2010
Maximum Wind Speed 18.7 mph 16:43 16.5 mph 18.7 mph, 2016 9.2 mph, 2010
Maximum Gust 31.4 mph 19:17 24.2 mph 31.4 mph, 2016 12.1 mph, 2010
Mean Wind Direction W
Rainfall 3.1 mm 34.8 mm (126%) 3.1 mm, 2016
Maximum Hourly Rain 1.1 mm 15:44 1.1 mm, 2016
Maximum 10-min Rain 0.3 mm 15:07 0.4 mm, 2015
Maximum Rain Rate 1.2 mm/h 15:07 1.4 mm/h, 2015
Minimum Dew Point 4.9 °C 11:50 -0.7 °C 7.5 °C, 2017 -6.8 °C, 2012
Maximum Dew Point 10.4 °C 17:35 5.2 °C 12.2 °C, 2017 1.1 °C, 2012
Mean Dew Point 8.1 °C 2.4 °C 9.4 °C, 2017 -2.9 °C, 2012
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 8.2 °C * 21:06 4.4 °C 10.1 °C, 2017 -2.0 °C, 2012
Day Maximum (09-21) * 12.1 °C * 19:15 8.7 °C 17.1 °C, 2017 4.2 °C, 2013
Max 10m Temp Rise 0.3 °C 09:24 0.3 °C 0.8 °C, 2009 0.1 °C, 2011
Max 1hr Temp Rise 1.2 °C 09:49 1.3 °C 2.8 °C, 2012 0.3 °C, 2011
Max 1hr Hum Rise 13% 13:45 7% 13%, 2014 1%, 2011
Max 10m Temp Fall 0.3 °C 13:21 0.4 °C 0.9 °C, 2014 0.1 °C, 2011
Max 1hr Temp Fall 1.0 °C 13:37 1.2 °C 2.5 °C, 2014 0.3 °C, 2011
Max 1hr Hum Fall 11% 11:26 10% 21%, 2009 1%, 2011
Max 10m Wind Speed 14.3 mph 16:45 12.9 mph 15.3 mph, 2018 5.7 mph, 2010
Minimum Feels-like 4.8 °C 06:09 -0.4 °C 10.3 °C, 2017 -5.7 °C, 2012
Maximum Feels-like 13.5 °C 17:47 7.4 °C 19.4 °C, 2017 3.3 °C, 2013
Mean Feels-like 10.0 °C 4.0 °C 13.6 °C, 2017 -0.6 °C, 2013
Air-frost Hrs 0 hrs 0.2 hrs 10 hrs, 2010 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 3.7 °C (-1.8) 5.1 °C (-0.1) 10.3 °C (+4.8), 2012 1.5 °C (-4.0), 2011
Humidity Range 27% 28% 44%, 2009 5%, 2011
Pressure Range 3 hPa 11 hPa 14 hPa, 2014 3 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]54 hrs (102%) [31%] 6 [65%], 2010 0 [0%], 2011
Wet Hours 6
[Mean rain rate: 0.5 mm/h]
48 hrs (134%) [10%] 6, 2016 , 2009
Cloud Cover am: Mostly Cloudy
pm: Overcast
Events None
Comments o.night, pm Light Rain
Extra Comments
Issues Wind data from Harpenden
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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