Daily Report for 9th May 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 14.2 °C (+6.9) 05:44 8.2 °C (+1.3) 14.2 °C (+6.9), 2016 6.3 °C (-1.0), 2010
Maximum Temperature 24.8 °C (+9.0) 13:40 20.7 °C (+5.2) 24.8 °C (+9.0), 2016 11.5 °C (-4.3), 2010
Mean Temperature 18.5 °C (+7.9) 14.8 °C (+3.3) 18.5 °C, 2016 8.4 °C, 2010
Minimum Humidity 33% 13:55 34% 72%, 2012 33%, 2016
Maximum Humidity 78% 22:11 77% 95%, 2012 74%, 2017
Mean Humidity 56% 54% 90%, 2012 56%, 2016
Minimum Pressure 1007 hPa 08:49 1013 hPa 1019 hPa, 2011 1005 hPa, 2013
Maximum Pressure 1009 hPa 16:40 1019 hPa 1029 hPa, 2017 1009 hPa, 2016
Mean Pressure 1008 hPa 1016 hPa 1022 hPa, 2017 1008 hPa, 2016
Mean Wind Speed 3.2 mph (-1.5) 3.6 mph (-1.1) 10.0 mph, 2013 2.8 mph, 2017
Maximum Wind Speed 12.7 mph 14:55 11.9 mph 24.6 mph, 2013 8.3 mph, 2017
Maximum Gust 19.9 mph 14:56 18.3 mph 38.4 mph, 2013 12.6 mph, 2017
Mean Wind Direction ESE
Rainfall 2.0 mm 2.2 mm (15%) 4.9 mm, 2012
Maximum Hourly Rain 0.9 mm 17:32 1.5 mm, 2012
Maximum 10-min Rain 0.5 mm 17:16 0.9 mm, 2012
Maximum Rain Rate 10 mm/h 17:10 10 mm/h, 2016
Minimum Dew Point 5.4 °C 03:13 1.2 °C 8.5 °C, 2012 1.1 °C, 2017
Maximum Dew Point 12.6 °C 22:11 8.2 °C 14.0 °C, 2012 4.3 °C, 2017
Mean Dew Point 9.1 °C 4.7 °C 11.6 °C, 2012 2.6 °C, 2017
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 14.2 °C 05:44 8.3 °C 14.2 °C, 2016 6.3 °C, 2010
Day Maximum (09-21) 24.8 °C 13:40 20.7 °C 24.8 °C, 2016 11.5 °C, 2010
Max 10m Temp Rise 0.8 °C 08:58 0.8 °C 0.9 °C, 2009 0.5 °C, 2010
Max 1hr Temp Rise 3.1 °C 09:22 3.3 °C 3.4 °C, 2018 1.7 °C, 2010
Max 1hr Hum Rise 18% 17:54 8% 28%, 2013 5%, 2015
Max 10m Temp Fall 0.7 °C 14:20 0.5 °C 1.2 °C, 2013 0.3 °C, 2010
Max 1hr Temp Fall 2.6 °C 17:48 2.0 °C 3.0 °C, 2013 1.1 °C, 2012
Max 1hr Hum Fall 10% 09:48 13% 24%, 2013 6%, 2012
Max 10m Wind Speed 10.8 mph 15:01 9.3 mph 18.7 mph, 2013 7.2 mph, 2017
Minimum Feels-like 14.2 °C 05:36 7.6 °C 14.2 °C, 2016 3.1 °C, 2017
Maximum Feels-like 25.7 °C 13:33 21.0 °C 25.7 °C, 2016 11.5 °C, 2010
Mean Feels-like 19.5 °C 14.9 °C 19.5 °C, 2016 7.1 °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 10.6 °C (+2.1) 12.5 °C (+3.9) 12.8 °C (+4.3), 2018 4.5 °C (-4.0), 2012
Humidity Range 45% 42% 54%, 2018 23%, 2012
Pressure Range 2 hPa 6 hPa 14 hPa, 2017 2 hPa, 2016
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 6 [43%]83 hrs (156%) [67%] 12.5 [90%], 2011 0 [0%], 2012
Wet Hours 4
[Mean rain rate: 0.5 mm/h]
5 hrs (43%) [2.3%] 6, 2012 0, 2009
Cloud Cover am: Mostly Cloudy transitioned to Sunny
pm: Hazy transitioned to Overcast
Events None
Comments eve Rain/Showers
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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