Daily Report for 4th May 2016

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 4.0 °C (-2.6) 06:00 5.0 °C (-1.5) 11.8 °C (+5.2), 2015 2.8 °C (-3.8), 2010
Maximum Temperature 18.4 °C (+3.2) 14:33 16.9 °C (+1.8) 20.2 °C (+5.0), 2018 8.9 °C (-6.3), 2012
Mean Temperature 12.8 °C (+0.3) 11.5 °C (+0.1) 15.3 °C, 2018 7.1 °C, 2010
Minimum Humidity 33% 18:13 38% 80%, 2012 33%, 2016
Maximum Humidity 80% 06:52 83% 96%, 2012 73%, 2013
Mean Humidity 50% 59% 89%, 2012 50%, 2016
Minimum Pressure 1024 hPa 20:05 1022 hPa 1025 hPa, 2010 992 hPa, 2015
Maximum Pressure 1028 hPa 04:00 1028 hPa 1028 hPa, 2009 1005 hPa, 2015
Mean Pressure 1026 hPa 1024 hPa 1026 hPa, 2010 1002 hPa, 2015
Mean Wind Speed 3.0 mph (-1.7) 4.7 mph (-0.0) 7.1 mph, 2013 2.5 mph, 2018
Maximum Wind Speed 11.7 mph 15:18 13.2 mph 16.8 mph, 2013 8.7 mph, 2012
Maximum Gust 17.8 mph 15:19 18.9 mph 24.4 mph, 2015 10.9 mph, 2014
Mean Wind Direction SSW
Rainfall 0.0 mm 0.2 mm (3%) 4.5 mm, 2015
Maximum Hourly Rain n/a 2.6, 2015
Maximum 10-min Rain n/a 0.8, 2015
Maximum Rain Rate n/a 5.4, 2015
Minimum Dew Point -3.9 °C 23:57 -0.6 °C 5.5 °C, 2018 -3.9 °C, 2016
Maximum Dew Point 6.2 °C 08:16 6.8 °C 11.2 °C, 2018 3.4 °C, 2010
Mean Dew Point 1.6 °C 3.1 °C 7.9 °C, 2018 1.0 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) 4.0 °C 06:00 5.3 °C 11.8 °C, 2015 2.8 °C, 2010
Day Maximum (09-21) 18.4 °C 14:33 16.9 °C 20.2 °C, 2018 8.9 °C, 2012
Max 10m Temp Rise 1.0 °C 07:25 0.8 °C 1.0 °C, 2016 0.4 °C, 2010
Max 1hr Temp Rise 4.9 °C 07:59 3.4 °C 4.9 °C, 2016 1.0 °C, 2017
Max 1hr Hum Rise 4% 01:39 8% 14%, 2015 3%, 2012
Max 10m Temp Fall 0.4 °C 01:26 0.6 °C 0.7 °C, 2018 0.2 °C, 2012
Max 1hr Temp Fall 1.8 °C 20:42 2.0 °C 1.8 °C, 2016 0.5 °C, 2012
Max 1hr Hum Fall 18% 09:19 14% 26%, 2013 8%, 2010
Max 10m Wind Speed 7.9 mph 13:33 10.1 mph 13.9 mph, 2013 6.1 mph, 2012
Minimum Feels-like 4.0 °C 05:52 3.7 °C 12.0 °C, 2015 0.2 °C, 2010
Maximum Feels-like 18.4 °C 14:06 17.1 °C 21.6 °C, 2018 8.9 °C, 2012
Mean Feels-like 12.8 °C 11.5 °C 15.8 °C, 2018 5.7 °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 14.4 °C (+5.8) 11.9 °C (+3.3) 14.4 °C (+5.8), 2016 2.2 °C (-6.4), 2012
Humidity Range 47% 45% 51%, 2015 16%, 2012
Pressure Range 4 hPa 6 hPa 13 hPa, 2015 1 hPa, 2011
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 13.5 [99%]35 hrs (150%) [65%] 13.5 [99%], 2011 0 [0%], 2012
Wet Hours 01 hrs (19%) [1%] 4, 2015 0, 2010
Cloud Cover Sunny with periods of Mostly Sunny
Events Maximum possible sunshine
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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