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 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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