Daily Report for 15th May 2012

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.8 °C (-3.3) 23:58 7.4 °C (+0.1) 8.7 °C (+0.6), 2009 4.8 °C (-3.3), 2012
Maximum Temperature 11.5 °C (-5.1) 14:48 13.6 °C (-2.2) 20.9 °C (+4.3), 2014 11.5 °C (-5.1), 2012
Mean Temperature 7.5 °C (-4.2) 10.6 °C (-1.0) 14.7 °C, 2014 7.5 °C, 2012
Minimum Humidity 56% 13:14 60% 59%, 2009 38%, 2014
Maximum Humidity 91% 09:04 90% 94%, 2009 75%, 2010
Mean Humidity 79% 77% 81%, 2009 58%, 2010
Minimum Pressure 1011 hPa 05:48 1012 hPa 1033 hPa, 2014 987 hPa, 2013
Maximum Pressure 1023 hPa 22:57 1020 hPa 1036 hPa, 2014 1001 hPa, 2013
Mean Pressure 1017 hPa 1016 hPa 1035 hPa, 2014 994 hPa, 2013
Mean Wind Speed 4.7 mph (+0.0) 5.0 mph (+0.3) 8.5 mph, 2013 1.4 mph, 2014
Maximum Wind Speed 17.5 mph 13.1 mph 21.5 mph, 2013 6.7 mph, 2014
Maximum Gust 25.1 mph 13:13 18.9 mph 30.8 mph, 2013 8.7 mph, 2014
Mean Wind Direction NW
Rainfall 5.9 mm 44.2 mm (179%) 5.9 mm, 2012
Maximum Hourly Rain 1.8 mm 08:07 2.5 mm, 2009
Maximum 10-min Rain 0.8 mm 18:02 1.2 mm, 2009
Maximum Rain Rate 8 mm/h 18:03 16 mm/h, 2009
Minimum Dew Point 2.2 °C 15:26 3.9 °C 6.0 °C, 2009 1.8 °C, 2013
Maximum Dew Point 6.2 °C 17:49 9.1 °C 11.6 °C, 2009 6.2 °C, 2012
Mean Dew Point 3.9 °C 6.4 °C 9.3 °C, 2009 3.3 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 5.0 °C * 08:10 7.8 °C 11.7 °C, 2009 5.0 °C, 2012
Day Maximum (09-21) 11.5 °C 14:48 13.6 °C 20.9 °C, 2014 11.5 °C, 2012
Max 10m Temp Rise 0.8 °C 16:09 0.6 °C 0.8 °C, 2009 0.5 °C, 2011
Max 1hr Temp Rise 2.0 °C 11:48 1.9 °C 3.6 °C, 2014 1.2 °C, 2009
Max 1hr Hum Rise 15% 17:13 8% 15%, 2012 5%, 2011
Max 10m Temp Fall 1.6 °C 16:26 0.5 °C 1.6 °C, 2012 0.4 °C, 2010
Max 1hr Temp Fall 3.3 °C 17:13 1.6 °C 3.3 °C, 2012 1.5 °C, 2009
Max 1hr Hum Fall 14% 11:58 10% 14%, 2012 7%, 2010
Max 10m Wind Speed 8.9 mph 18:03 8.3 mph 16.4 mph, 2013 4.8 mph, 2014
Minimum Feels-like 1.1 °C 08:45 6.0 °C 6.8 °C, 2010 1.1 °C, 2012
Maximum Feels-like 11.5 °C 14:48 14.5 °C 21.0 °C, 2014 11.5 °C, 2012
Mean Feels-like 6.2 °C 10.6 °C 14.8 °C, 2014 6.2 °C, 2012
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (-1.7) 6.2 °C (-2.3) 13.9 °C (+5.5), 2014 6.7 °C (-1.7), 2012
Humidity Range 35% 31% 49%, 2014 33%, 2010
Pressure Range 12 hPa 8 hPa 14 hPa, 2013 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 3.5 [25%]41 hrs (46%) [20%] 10 [71%], 2014 1.3 [9%], 2013
Wet Hours 4
[Mean rain rate: 1.5 mm/h]
37 hrs (189%) [10%] 4, 2009 0, 2010
Cloud Cover Mostly Cloudy
Events Thunder
Comments 07-0830 Light-Moderate Rain; 13--20 Light-Moderate Showers with Thunder
Extra Comments Thundery around and about, with Hail reported in Finchley
Issues None known
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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