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 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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