Weather.com is reporting that there is a 30% chance of snow for Sunday's Packers/Eagles game.
As for the temperature, the site also said that Green Bay's high for the day is just 29 degrees, while the low is 16. 15-mile-per-hour winds are also expected around kickoff, which was moved from noon to 3:25 earlier this month.
In other words, it will be pretty cold during the contest, so make sure to wear plenty of layers if you're going. You don't want to be at Lambeau when it's freezing out, regardless of how much the Packers are winning.