Case Keenum has done things this year he’s never done before, and he’s going to add to that list tomorrow night. The Vikings quarterback — who gets to play home games indoors after previously playing home games in a St. Louis dome, Los Angeles and Houston — has never started at a game when the temperature was below freezing. “I’m going to have a plan, as far as what I’m going to wear, but other than that it’s football; it’s cold for everybody,” Keenum said, via John Shipley of the St. Paul Pioneer Press. “We’ve got to go out and execute.” Keenum has been one of the hottest quarterbacks in the league this year, but hasn’t started a game in his career in which the temperature at kickoff was lower than 36 degrees.