2011: Outside The Top Ten

November 2011 was cooler than; 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001.

Expert confirms Republic's first case of fatal virus in red squirrel - The Irish Times - Sat, Dec 17, 2011

One theory being examined by Dr Marnell is the impact of the unseasonably cold winter last year, which may have put grey squirrels under stress, “possibly allowing them to manifest the disease”.