While the 49ers have been practicing in unseasonably warm, mid-60-degree weather in the Santa Clara Valley this week, the Packers have ventured outside in an effort to get better acclimated with the bitter cold that awaits them on Sunday.
The 49ers, however, at least will get a taste of the arctic blast that's sitting over the upper Midwest.
Jim Harbaugh today said the team would hold a Saturday walk-through outdoors, either at Lambeau Field or at a nearby practice field. As The Milwaukee Journal Sentinel's Tom Silverstein writes, that walk through likely will be at the practice facility, especially if it snows Saturday morning as forecast.
If that's the case, the Lambeau playing surface will be covered with a tarp, which won't be lifted until shortly before kickoff at 1:40 p.m. (PST).
The good news for the 49ers is that Green Bay will experience a warm-up (relatively speaking, of course) on Saturday, with temperatures topping out at 26 degrees. The bad news is that the temperature won't give Harbaugh and his players a true sample of what they'll get the following day.
The forecast calls for rapidly dropping temperatures Sunday with an expected high of 4 degrees, a low of minus-20 degrees and a wind-chill of up to minus-50 degrees. That means the swing between the high temperature Saturday to the low temperature Sunday is roughly the same as the difference between Santa Clara's high temperature this week and Green Bay's high temperature Saturday.
That is, the 49ers are easing themselves into what could be one of the coldest NFL games ever played.
-- Matt Barrows