May 2015 Summary

In Brief:
Cool and mostly unsettled, although on the dry side.

Temperature: [Minimum]:
Night-time temperatures ranged from 5.3 degs C on the night of the 12th/13th, to 11.8 degs C on the night of the 10th/11th.  There has been a milder night than this during every May since at least 2004.
Note the mildest and coldest nights of the month were only 48 hours apart.
The average minimum for the month was 8.82 degs C, the lowest for May since at least 2004.
The temperature did not fall below 5 degs C in May 2015.  Since 2004 this happened in 2005, 2010 and 2014.

Temperature: [Maximum]:
The coldest day of the month was the 1st with 11.3 degs C.  This was the coldest day in May since 2005.
The warmest day of the month was the 23rd with 22.3 degs C, which was the warmest day in May since 2012, although the temperature was not as high as 22.6 degs C reached in April.
The average maximum for the month was 16.53 degs C, the second lowest for May since 2004. May 2013 was colder, with an average maximum of 16.23 degs C.  The average for May 2015 only narrowly exceeded that of April, which was 15.98 degs C.
The temperature exceeded 20 degs C on only one day in May 2015, equal to the number of times it did so in May 2009.  This was one more time than in May 2013 though.  It exceeded 20 degs C twice in April 2015.

Rainfall:
71.1 mm of rain fell during May 2015, making it the driest May since 2012, but the wettest month since February 2015.  The wettest day itself was the 3rd with 10.2 mm.
This compares to only 18.6 mm in April 2015, and 80.1 mm in May 2014.
Although the total amount of rain was relatively low, it was spread throughout the month and there were only 11 completely dry days, the lowest figure for May since at least 2008, and the lowest of any month since January 2015.
There were 15 days with no measurable rain during May 2015, two more than in May 2014.
The longest dry spell of May 2015 was from the 21st to the 28th when there was no measurable rain.
There was at least some rain every day of the month until the 9th, with the wettest period being from the 2nd to the 5th with 32.8 mm.

Cumulatively, 453.3 mm of rain has fallen between January and May 2015, compared to 705.9 mm during the same period in 2014 [-35.78%].

Thunder:
None this month.