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 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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Webcam Summary of Cloud Conditions

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