Snowball Fight! IT must be winter on the cover of The Muppets #4 (2012) by Elisabetta Melaranci.
Christmas may be over, but we're filling out December with winter-themed comics covers!
(2012: Marvel Adventures Spider-Man #46)
(2011: Spooky Spooktown #62)
(2010: Spooky #78)
(2009: P.S. Magazine: The Preventive Maintenance Monthly #11)