While North Dakotans get plenty of practice bundling up, folks in other parts of the country were still learning the basics.
In Mobile, Ala., hit by a rare arctic chill on the coast, Salvation Army spokesman Stacey Killingsworth said shelters were "filled to the brim." One that normally holds up to 28 homeless men a night has been averaging 115 in recent days, she said.
"We don't turn anyone away, including women and children. We've used cots and mats. We've put people in the auditorium and hallways," she said.
In Florida's Panhandle, vapor was rising off the Gulf as warm water met the frigid air.
"It's so cold that sparrows that have crawled under the plastic on our heated deck don't want to leave," said Scooter Montgomery, manager of Peg Leg Pete's Oyster Bar on Pensacola Beach.