In reply to Vaughany89:
Using Ben Nevis instead of the Cairngorms produces the following for the last 10 years on a scale of nothing, poor, ok, good, very good
March 2006 - good
March 2007 - good
March 2008 - good
March 2009 - ok
March 2010 - good
March 2011 - poor
March 2012 - nothing
March 2013 - Very good
March 2014 - ok
March 2015 - good/very good
So, according to my highly scientific measurement scale you have a 1/10 chance of it being bollox and a 6/10 chance of it being pretty good....