Daily Report for 1st May 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 1.5 °C (-4.7) 04:36 1.5 °C (-4.9) 10.8 °C (+4.6), 2012 1.5 °C (-4.7), 2016
Maximum Temperature 16.8 °C (+2.0) 16:15 16.8 °C (+1.9) 21.0 °C (+6.2), 2009 12.7 °C (-2.1), 2017
Mean Temperature 10.1 °C (-1.4) 10.1 °C (-1.5) 14.1 °C, 2009 8.6 °C, 2015
Minimum Humidity 33% 15:39 33% 72%, 2014 33%, 2016
Maximum Humidity 84% 07:01 84% 97%, 2012 66%, 2011
Mean Humidity 57% 57% 90%, 2014 52%, 2011
Minimum Pressure 1026 hPa 20:14 1026 hPa 1026 hPa, 2016 998 hPa, 2017
Maximum Pressure 1029 hPa 09:08 1029 hPa 1029 hPa, 2016 1010 hPa, 2010
Mean Pressure 1027 hPa 1027 hPa 1027 hPa, 2016 1004 hPa, 2017
Mean Wind Speed 4.7 mph (+0.0) 4.7 mph (+0.0) 9.2 mph, 2011 1.6 mph, 2014
Maximum Wind Speed 12.4 mph 14:29 12.4 mph 18.5 mph, 2011 8.5 mph, 2014
Maximum Gust 16.8 mph 11:52 16.8 mph 27.3 mph, 2011 12.3 mph, 2014
Mean Wind Direction SW
Rainfall 0.0 mm 0.0 mm (0%) 31.7 mm, 2010
Maximum Hourly Rain n/a 13.1, 2010
Maximum 10-min Rain n/a 4.1, 2010
Maximum Rain Rate n/a 60, 2010
Minimum Dew Point -2.0 °C 03:06 -2.0 °C 8.2 °C, 2012 -2.7 °C, 2013
Maximum Dew Point 5.4 °C 23:58 5.4 °C 13.6 °C, 2012 2.8 °C, 2015
Mean Dew Point 1.1 °C 1.1 °C 10.7 °C, 2012 0.8 °C, 2013
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 1.5 °C 04:36 1.5 °C 10.8 °C, 2012 1.5 °C, 2016
Day Maximum (09-21) 16.8 °C 16:15 16.8 °C 21.0 °C, 2009 12.7 °C, 2017
Max 10m Temp Rise 1.0 °C 07:29 1.0 °C 1.6 °C, 2009 0.3 °C, 2014
Max 1hr Temp Rise 4.5 °C 07:52 4.5 °C 4.5 °C, 2016 0.7 °C, 2014
Max 1hr Hum Rise 8% 21:31 8% 16%, 2010 4%, 2014
Max 10m Temp Fall 0.5 °C 16:27 0.5 °C 0.9 °C, 2009 0.3 °C, 2014
Max 1hr Temp Fall 1.6 °C 19:24 1.6 °C 2.7 °C, 2010 0.7 °C, 2014
Max 1hr Hum Fall 14% 09:45 14% 22%, 2013 3%, 2014
Max 10m Wind Speed 9.9 mph 17:57 9.9 mph 13.0 mph, 2018 6.2 mph, 2014
Minimum Feels-like 0.7 °C 04:48 0.7 °C 12.2 °C, 2012 -0.9 °C, 2018
Maximum Feels-like 16.8 °C 16:14 16.8 °C 19.2 °C, 2012 13.0 °C, 2017
Mean Feels-like 10.0 °C 10.0 °C 14.8 °C, 2012 7.3 °C, 2015
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 15.3 °C (+6.7) 15.3 °C (+6.7) 15.3 °C (+6.7), 2016 3.2 °C (-5.4), 2014
Humidity Range 51% 51% 56%, 2013 17%, 2017
Pressure Range 3 hPa 3 hPa 16 hPa, 2017 2 hPa, 2010
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 11 [82%]11 hrs (189%) [81%] 11 [82%], 2011 0 [0%], 2014
Wet Hours 00 hrs (0%) [0%] 13, 2014 0, 2009
Cloud Cover Sunny with periods of Mostly Sunny
Events None
Comments -
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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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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