Sunday's playoff matchup between the 49ers and Packers features quarterbacks Colin Kaepernick and Aaron Rodgers, running backs Frank Gore and Eddie Lacy and standout wide receivers in Anquan Boldin and Jordy Nelson.But the star of Sunday's show could be the weather.The Weather Channel now projects a high of 4 degrees for the game. Temperatures could drop to zero or below. As of now, snow isn't in the picture, but that could change. No matter what, the Niners will be playing in weather they haven't experienced all season – or, in some cases, their entire lives."Winter is coming," said Rodgers. "It's here. It's here in Green Bay. It's definitely going to have an effect on the game."Rodgers, who's played many games in the cold and snow at Lambeau Field, said the game could come down to "who can execute in the cold weather.""It does some different things to the football," he said.Particularly to quarterbacks, receivers and kickers. The football turns into a hardened missile, which can be tough to throw and catch.Though the 49ers players describe their team as one built for cold weather – with a physical running game and strong defense – it's hard to know how the...