The frigid conditions canceled more flights, and the number of deaths blamed on the cold climbed to 13, including one in Ohio.
An off-duty Ligonier, Indiana, Police Officer Ethan Kiser, 22, and his wife Shawna, 21, died Monday after their auto swerved out of control on a snowy road and hit an oncoming vehicle.
Authorities say she may have been staying in the house for months and apparently died in the last day or two.
Elsewhere, life slowly returned to normal as some students returned to school, train travel resumed and businesses reopened.More news: Barcelona agree €12m deal with Atletico Mineiro for defender Emerson
"Temperatures will remain around 15 degrees below average for the date". It pushed eastward, and states including Massachusetts, New York, and Pennsylvania experienced bitterly cold temperatures.
Authorities in Buffalo, New York, said two men died clearing snow and a third expired in Livingston County after his vehicle hit a snowdrift early Thursday. But it didn't take long into the late afternoon for the mercury to plummet again to readings well below minus-20, minus-30 and in some locations in north-central Minnesota, minus-40 by Thursday morning. That was the temperature in Utqiagvik (also known as Barrow) a town of about 4,400 that sits north of the Arctic Circle.
Water mains froze in Detroit, Chicago and parts of Canada, and power outages were reported in Iowa and Wisconsin. Chicago was hardest hit, with O'Hare International Airport experiencing over 700 cancellations.
After sunset Wednesday, temperatures were to drop again, sinking so low that the record for Chicago - 27 degrees below zero - could be reached. Milwaukee's low was minus-25 degrees. With winds blowing at 5 to 10 miles per hour, wind chill would have been around minus-65 degrees.
Rockford, Illinois, saw a record low temperature of minus-31, on Thursday.More news: Apple, Facebook spat is over, for now-iOS certificate access restored
Numerous same Midwestern commuters who bundled up like polar explorers this week might soon get by with a light jacket. In nine states, mail delivery has stopped. Before the weekend warms up, more snow will hit parts of Illinois, Indiana and OH, the National Weather Service said.
Consumers Energy, a natural gas provider in MI, had a fire on Wednesday morning that damaged equipment and temporarily affected how much gas could be sent out to customers. By Thursday, Consumers Energy said it was "cautiously optimistic" that its requests to curb natural gas use were "having a positive effect".
But on Friday, Amtrak train services that were halted since Wednesday in Chicago's hub will resume, as will US Postal service halted or limited in six Midwest states.
"You could see the look on their faces".
General Motors Co suspended operations at 11 MI plants and its Warren Tech Centre after a utility made an emergency appeal to users to conserve natural gas after extreme cold and a fire at a compressor station. A day earlier, a horse that became stuck between two tree trunks in northern in was rescued by a chainsaw-wielding town marshal.More news: Musk releases all Tesla patents to help save the Earth