December football often involves weather challenges, and while Week 14 gave a hint with Josh Allen’s performance against the Bengals, Week 15 promises to deliver much harsher conditions.

A polar vortex from Canada is expected to bring extremely cold weather to the Midwest and eventually to the East Coast. Many regions will experience temperatures in the single digits, not taking into account the wind chill effects.

“This is the mother lode of cold air and is a term I don’t use lightly,” says AccuWeather meteorologist Bernie Rayno.

But despite the harsh conditions, the NFL is set to proceed, with teams needing to contend with both their opponents and the inclement weather.

Browns at Bears (Sunday, 1 p.m. ET)

Chicago, IL
Sunday weather: High of 11°F, feels like 1°F, wind gusts up to 22 mph.

There is no snow in the forecast, but the temperature is expected to drop significantly with potential flurries on Friday and Saturday. The Browns and Bears are accustomed to tough conditions.

This game marks the coldest game of Caleb Williams’ NFL career.

Ravens at Bengals (Sunday, 1 p.m. ET)

Cincinnati, OH
Sunday weather: High of 12°F, feels like 2°F, wind gusts up to 17 mph.

Cincinnati is forecasted to face significant snowfall just before this crucial AFC North game. Joe Burrow has shown resilience in adverse weather, previously performing well in similar conditions.

Chargers at Chiefs (Sunday, 1 p.m. ET)

Kansas City, MO
Sunday weather: High of 23°F, feels like 23°F, wind gusts up to 10 mph.

While conditions in Kansas City won’t be as severe, the Chargers should brace themselves for the stark contrast from their Southern California weather.

Bills at Patriots (Sunday, 1 p.m. ET)

Foxborough, MA
Sunday weather: High of 32°F, feels like 22°F, 1-3 inches of snow expected, and wind gusts up to 21 mph.

Josh Allen will have to navigate another snow game while leading his team amid playoff contention.

Colts at Seahawks (Sunday, 4:25 p.m. ET)

Seattle, WA
Sunday weather: High of 56°F, with an 80% chance of rain.

Seattle is facing another rain issue due to back-to-back atmospheric rivers.

Dolphins at Steelers (Monday, 8:15 p.m. ET)

Pittsburgh, PA
Monday weather: High of 22°F, feels like 12°F, wind gusts up to 18 mph.

Tua Tagovailoa will need to overcome past struggles in colder temperatures to keep the Dolphins’ playoff hopes alive.