Dates of First Reaching 20 Degrees C

It has now been almost 3 years since I last posted the dates when 20 degrees C was first reached at this location in a particular year.  Given the recent high temperatures in other parts of the UK, here is an updated listing to include 2013 to 2015.

2004 - April 26
2005 - May 1
2006 - April 25
2007 - April 22
2008 - May 4
2009 - May 31
2010 - April 26
2011 - April 25
2012 - May 23
2013 - June 7
2014 - May 16
2015 - April 6

As of today, May 9, 20 degrees C is yet to be reached in 2016.  As can be seen above it has nearly always happened in either April or May.
Last year was the earliest [of all 13 years recorded], and 2013 was the year it took longest to attain that temperature - until June 7 in fact.  Still almost a month to go then before a new record maybe set!