averagejoe
You fell victim to one of the classic blunders.
I think the Bears will have a better defense; a better running game; and worse weather to play in. For those reasons I would go with Luck.
Really doesn't get bitterly cold until December (if you can even call it "bitterly"), which is essentially fantasy playoff time. And cold isn't really a factor for outdoor teams. Doesn't seem to slow the Packers down. And since you brought up the weather, let's not forget that the Vikings will start to play outdoors again starting this season, for all of you Patterson, AP, Rudolph and Walsh owners.
Here's the temp averages in December:
Chicago = Hi 27. Lo 24
Green Bay = Hi 29. Lo 15.
Minneapolis = Hi 27. Lo 12.