Temperatures have been falling all through the day Sunday, as an Arctic chill we haven't seen since last winter moves into the area. A wind chill advisory is in effect for much of the Upper Midwest Sunday night and Monday morning (light blue on the map below).
Wind chills could reach 30-40 below zero across northern Minnesota and 15-20 below in the southern part of the state by Monday morning, the National Weather Service says.
Wind chill values this cold could result in frostbite in 15 to 30 minutes if people don't dress properly.
So far, there are no reports of schools being canceled Monday due to the cold. A few weeks ago, St. Paul public schools announced a cold day policy, stating if the forecasted air temperature is minus-25 or if the wind chill is minus-40 or lower schools would be closed.
It's not supposed to be that cold in St. Paul Monday, according to the weather service's forecast.
Ice fishing off to early start
The chilly temperatures are good news for anglers, however. WCCO is reporting the ice fishing season is off to an early start in the Twin Cities, with some lakes having ice more than 7 inches thick.
A Twin Cities bait shop owner told the news station it's been a long time since he's opened his shop in November, noting last year he opened Dec. 15 for the ice fishing season.
Although some lakes are safe to walk on, the Minnesota Department of Natural Resources continues to warn that not all lakes are safe.
The DNR recommends ice be 4 inches thick for walking, 5 inches for a snowmobile, 8-12 inches for a car and 12-15 inches for a medium-sized truck.