LAKE FOREST, Ill. -- You better dress warm Sunday at Soldier Field.

The latest forecast for the Chicago Bears and Green Bay Packers game on Sunday calls for a high of 1 degree with 15 mph winds, which would be the coldest game ever played in Chicago.

“We’re all over the forecast,” Bears coach John Fox said.

Both the Bears and Packers practiced outside this week to prepare for what could be historically cold weather in Chicago. Joe Robbins/Getty Images

Currently, the coldest game in Chicago history occurred in 2008 when the Bears and Packers played in 2 degree weather. The NFC North rivals also met in 1983 when the temperature fell to 3 degrees. The Bears won both games.

To prepare for the bitter cold, the Bears practiced on Thursday with the doors open in their indoor facility -- the Walter Payton Center -- before moving to the outdoor practice fields to finish the workout.

In Green Bay, where the temperature is not expected to rise above single digits on Thursday, Packers coach Mike McCarthy took the team outside for the team portion of practice.

“Well, we’re fortunate that we can practice in it,” McCarthy said. “It’s going to be similar to what we’re going to play in. It’s really, it’s the focus.”

Green Bay quarterback Aaron Rodgers added: “I think really anywhere for 10 and below is difficult to handle it, but not a huge change. We practice outside in these conditions, so we’re used to the elements and how it affects the football. We’ve done a good job over the years of taking care of the football in these types of games.”

Green Bay holds the distinction of playing in the coldest game in NFL history -- the 1967 "Ice Bowl" versus the Dallas Cowboys where the temperature plummeted to minus-13 degrees at Lambeau Field.

"A lot of us took our children home at halftime," said Barbara Knippel, who was married to Packers Hall of Famer Jerry Kramer at the time. "Most of us had another one at home. That was Dan for me. He was only 3, so he was at home with a babysitter, and we all took the older ones home because of the cold. My oldest son, Tony, did have frostbite on the cheeks, and then all of us, the wives, went back."

The Packers additionally hosted games with temperatures at minus-1 (2008 playoff game against the New York Giants), 0 degrees (1993 versus the Los Angeles Raiders), 2 degrees (1990 against Detroit) and 3 degrees (1997 NFC Championship game versus Carolina).

ESPN’s Rob Demovsky contributed to this story.