Daily Report for 30th April 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 2.4 °C (-3.7) 05:45 5.0 °C (-0.1) 10.9 °C (+4.8), 2011 2.4 °C (-3.7), 2016
Maximum Temperature 12.5 °C (-2.2) 13:39 13.0 °C (+0.1) 20.4 °C (+5.7), 2014 8.7 °C (-6.0), 2018
Mean Temperature 7.9 °C (-2.9) 9.0 °C (-0.0) 15.1 °C, 2011 6.4 °C, 2018
Minimum Humidity 36% 15:46 45% 62%, 2018 36%, 2013
Maximum Humidity 78% 07:10 85% 97%, 2014 71%, 2017
Mean Humidity 56% 66% 78%, 2018 52%, 2017
Minimum Pressure 1014 hPa 01:14 1009 hPa 1022 hPa, 2013 997 hPa, 2017
Maximum Pressure 1027 hPa 23:10 1015 hPa 1027 hPa, 2013 1008 hPa, 2017
Mean Pressure 1020 hPa 1012 hPa 1024 hPa, 2013 1000 hPa, 2017
Mean Wind Speed 4.0 mph (-0.9) 4.0 mph (-0.9) 7.9 mph, 2018 2.8 mph, 2014
Maximum Wind Speed 15.7 mph 15:31 12.3 mph 18.1 mph, 2011 10.9 mph, 2014
Maximum Gust 22.0 mph 15:24 19.0 mph 28.8 mph, 2018 17.0 mph, 2014
Mean Wind Direction NW
Rainfall 0.0 mm 50.5 mm (103%) 4.8 mm, 2018
Maximum Hourly Rain n/a 3, 2010
Maximum 10-min Rain n/a 1.4, 2010
Maximum Rain Rate n/a 30, 2010
Minimum Dew Point -3.1 °C 16:03 -0.2 °C 5.9 °C, 2010 -3.1 °C, 2016
Maximum Dew Point 3.2 °C 09:23 6.0 °C 12.5 °C, 2014 2.9 °C, 2013
Mean Dew Point -0.9 °C 2.6 °C 8.0 °C, 2010 -0.9 °C, 2016
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 2.4 °C 05:45 5.4 °C 10.9 °C, 2011 2.4 °C, 2016
Day Maximum (09-21) 12.5 °C 13:39 13.0 °C 20.4 °C, 2014 8.7 °C, 2018
Max 10m Temp Rise 0.7 °C 07:32 0.6 °C 0.8 °C, 2013 0.4 °C, 2011
Max 1hr Temp Rise 2.8 °C 08:16 2.3 °C 3.5 °C, 2013 0.9 °C, 2018
Max 1hr Hum Rise 10% 20:43 10% 13%, 2013 5%, 2009
Max 10m Temp Fall 0.7 °C 16:43 0.7 °C 0.9 °C, 2009 0.3 °C, 2018
Max 1hr Temp Fall 2.0 °C 20:44 1.8 °C 2.2 °C, 2015 0.9 °C, 2018
Max 1hr Hum Fall 16% 10:09 14% 20%, 2014 6%, 2017
Max 10m Wind Speed 12.1 mph 15:32 9.1 mph 13.0 mph, 2018 8.1 mph, 2014
Minimum Feels-like -0.3 °C 03:59 2.4 °C 11.3 °C, 2011 -1.2 °C, 2018
Maximum Feels-like 12.5 °C 13:24 13.0 °C 20.4 °C, 2014 8.0 °C, 2018
Mean Feels-like 7.0 °C 8.0 °C 15.4 °C, 2011 2.8 °C, 2018
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 10.1 °C (+1.5) 8.0 °C (+0.2) 13.6 °C (+5.0), 2014 4.0 °C (-4.6), 2018
Humidity Range 42% 41% 60%, 2014 24%, 2009
Pressure Range 13 hPa 6 hPa 13 hPa, 2016 3 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 10 [75%]152 hrs (110%) [40%] 13.4 [100%], 2011 0 [0%], 2018
Wet Hours 059 hrs (128%) [8.2%] 12, 2018 0, 2011
Cloud Cover am: Sunny transitioned to Partly Cloudy
pm: Partly Cloudy transitioned to Sunny
Events None
Comments possible 16 Shower
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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