Here is a link to the Old Farmer's Almanac.
http://www.almanac.com/weather/longrange

If you click on your area on the map it'll give you a 12 month forecast starting last Nov. 2010.
How accurate has it been so far?
Where I am the temps have been correct but the rainfall is wrong. We're wayyyy wetter than it predicted.

Mine is way off wettest and coldest ever

Wetter and colder here, too!