This warm spell is actually a bit special; I just had a glance over my records up to the first week of March for the years 2003-2012, and not one of them saw 15*C so early on in the spring season. 2012 was close, with the first on 11th March, and behind that is 2011 with 14th March. 2009, 2005 and 2004 all took until 16th March. 2006 never got there, and 2013... well that one peaked at 13.7*C
Oddly enough, the earliest 15*C in any of those years occured on 27th January 2003. The following year, 15*C was seen twice in February, on the 3rd and the 4th.
The next 'record' up for grabs is for the earliest occurance of consecutive days hitting 15*C or above, currently held jointly by 2009 (2 day run) and the far more impressive spell of 2005 (an 11 day run, averaging 17.7*C and peaking at 20*C. By comparison, the high-and-dry March of 2012 only managed 8 days!). Both of those spells started on the 16th.
Originally Posted by: Stormchaser