Daily Report for 11th May 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.7 °C (+7.1) 07:00 9.4 °C (+2.4) 14.7 °C (+7.1), 2016 3.1 °C (-4.5), 2010
Maximum Temperature 19.6 °C (+3.5) 18:14 20.2 °C (+4.7) 21.7 °C (+5.6), 2015 9.2 °C (-6.9), 2010
Mean Temperature 16.6 °C (+5.3) 15.0 °C (+3.5) 16.8 °C, 2015 6.8 °C, 2010
Minimum Humidity 80% 16:05 42% 80%, 2016 37%, 2012
Maximum Humidity 94% 07:23 80% 94%, 2016 75%, 2010
Mean Humidity 88% 60% 88%, 2016 60%, 2009
Minimum Pressure 1001 hPa 20:04 1012 hPa 1021 hPa, 2009 993 hPa, 2017
Maximum Pressure 1005 hPa 01:00 1017 hPa 1033 hPa, 2012 1001 hPa, 2017
Mean Pressure 1003 hPa 1014 hPa 1023 hPa, 2012 995 hPa, 2017
Mean Wind Speed 2.4 mph (-2.3) 3.4 mph (-1.3) 9.9 mph, 2014 2.4 mph, 2016
Maximum Wind Speed 8.6 mph 12:43 11.3 mph 18.5 mph, 2013 8.6 mph, 2016
Maximum Gust 11.5 mph 19:37 17.2 mph 28.6 mph, 2014 11.5 mph, 2016
Mean Wind Direction E
Rainfall 17.7 mm 25.1 mm (139%) 17.7 mm, 2016
Maximum Hourly Rain 8.1 mm 11:58 8.1 mm, 2016
Maximum 10-min Rain 4.1 mm 11:32 4.1 mm, 2016
Maximum Rain Rate 54 mm/h 11:28 54 mm/h, 2016
Minimum Dew Point 8.3 °C 06:59 2.8 °C 8.3 °C, 2016 -1.2 °C, 2010
Maximum Dew Point 18.8 °C 07:26 9.8 °C 18.8 °C, 2016 1.4 °C, 2010
Mean Dew Point 14.4 °C 6.4 °C 14.4 °C, 2016 -0.2 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.7 °C 07:00 9.5 °C 14.7 °C, 2016 3.1 °C, 2010
Day Maximum (09-21) 19.6 °C 18:14 20.2 °C 21.7 °C, 2015 9.2 °C, 2010
Max 10m Temp Rise 0.4 °C 15:12 0.7 °C 1.0 °C, 2011 0.4 °C, 2010
Max 1hr Temp Rise 1.2 °C 15:55 2.9 °C 4.4 °C, 2018 1.2 °C, 2016
Max 1hr Hum Rise 3% 16:30 8% 24%, 2013 3%, 2016
Max 10m Temp Fall 0.6 °C 18:37 0.5 °C 1.3 °C, 2013 0.3 °C, 2010
Max 1hr Temp Fall 1.2 °C 19:13 1.8 °C 4.0 °C, 2013 1.2 °C, 2010
Max 1hr Hum Fall 10% 08:23 11% 20%, 2018 9%, 2015
Max 10m Wind Speed 6.2 mph 14:56 8.8 mph 13.4 mph, 2014 5.5 mph, 2010
Minimum Feels-like 14.9 °C 06:59 9.2 °C 14.9 °C, 2016 0.9 °C, 2010
Maximum Feels-like 24.6 °C 18:13 21.3 °C 24.6 °C, 2016 7.9 °C, 2010
Mean Feels-like 20.2 °C 15.8 °C 20.2 °C, 2016 4.9 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 4.9 °C (-3.6) 10.8 °C (+2.3) 14.5 °C (+6.0), 2017 4.9 °C (-3.6), 2016
Humidity Range 14% 37% 53%, 2012 14%, 2016
Pressure Range 4 hPa 6 hPa 20 hPa, 2012 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0.5 [4%]84 hrs (128%) [55%] 11.6 [83%], 2009 0.5 [4%], 2016
Wet Hours 8
[Mean rain rate: 2.2 mm/h]
22 hrs (155%) [8.3%] 8, 2016 0, 2009
Cloud Cover am: Overcast
pm: Overcast transitioned to Mostly Cloudy
Events Thunder
Comments Rain spells; Showers (12 with Thunder)
Extra Comments
Issues T/H sensor failed at 07, casa data from 13-. Corrections applied. 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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