We've been in December 2003, 2005 and 2007.
I'm going to sound like I'm telling the story of Goldilocks now, but 2003 was too cold (50's), 2005 was just right (70's), and 2007 was too hot (mid 80's) !
We're also going in December 2009, so I'm packing everything from a swimsuit to a wolly...