The lowest windchill measured in the last 48 hours is -66 degrees in Ponsford, Minnesota, the National Weather Service said.
The lowest air temperature measured in that same time period is -48 degrees in Morris Camp, Minnesota.
By Meg Wagner, Brian Ries, Amanda Wills and Veronica Rocha, CNN
From CNN's Dave Alsup
The lowest windchill measured in the last 48 hours is -66 degrees in Ponsford, Minnesota, the National Weather Service said.
The lowest air temperature measured in that same time period is -48 degrees in Morris Camp, Minnesota.
Firefighters battling a house fire in Hammond, Indiana, in Wednesday's -22 degree weather ran in to a major problem: the hose water kept turning into ice.
"Everything got slowed down and even a fire hydrant was frozen," Hammond Fire Chief Jeff Smith told CNN. "I'm currently thawing out and so is my crew.”
The frozen water and cold temperatures created a number of issues for the firefighters.
"A couple guys slipped and fell on the ice, including me. They looked like snowmen, ice was falling and cracking of them," Smith said. "It was a difficult situation. Cold weather takes a little bit extra time."
The fire was reported 7:15 a.m. ET, but it took firefighters several hours to finally extinguish the flames. An older woman who lived in the home remained missing as of Wednesday afternoon, Smith said. The cause of the fire is under investigation, but firefighters think it started in the basement.
That part of the house, he said, was "filled with a couple feet of water that's turned into ice."
From CNN's Paul Murphy
All the runners in the Arrowhead 135 ultramarathon have completed the race, according to the race’s Facebook page.
While 146 runners started, only 52 completed the course.
“It has warmed up from -32 early this AM to a balmy -16,” race organizers said on Facebook within an hour of the racers finishing.
From CNN's Marlena Baldacci
At least nine deaths have been linked to the extreme weather and cold temperatures.
There have been at least three weather-related deaths following crashes in Iowa since Sunday, Iowa State Patrol Sgt. Nathan Ludwig told CNN. An additional death was reported at the University of Iowa on Wednesday morning.
Here's what we know so far:
The US Coast Guard rescued seven people Tuesday after they became stranded in an ice shanty near Sturgeon Bay in 4 below zero weather.
The group had become stranded on the ice due to the bitter cold and problems with their utility vehicle, so they propped up an ice shanty, according to the Coast Guard. The weather at the time was 4 below zero with -30-degree wind chills.
Coast Guard and Wisconsin Department of Natural Resources crews loaded the group on boats and took them to shore. They suffered no apparent injuries, the Coast Guard said in a statement.
You've seen the videos by now -- people toss boiling water into the freezing air and are rewarded with a puff of snow.
But did you know that with a touch of food coloring, one could make it snow red, white and blue (but mostly white)?
That's what one group of friends discovered this afternoon while gathered at Chicago's Lottie's Pub when they decided to test that theory.
See the video:
Video from Alina Butenko
From CNN's Christina Zdanowicz
A snow squall swept across parts of New York, Pennsylvania, New Jersey and Delaware this afternoon.
The narrow band of snow associated with Arctic front pushed through the area and brought high winds, cold temperatures and white-out conditions.
Here's what it looked like:
Delaware
New York
Philadelphia
From CNN's Chuck Johnston
Schools in Minneapolis and St. Paul will remain closed Thursday as bitterly cold temperatures continue to blast across the Midwest.
Temperatures should warm up starting Thursday, according to the National Weather Service.
"Temperatures are expected to rebound 75 degrees between Thursday morning and Sunday afternoon," NWS tweeted.
Meanwhile, this is how cold it was in Minnesota on Wednesday:
From CNN's Dave Hennen
It's currently a balmy 72 degrees in Key West, Florida, and 23 below zero in Thief River Falls, Minnesota. That's a 95 degree difference from north to south.
If you factor in the wind chill, it's even more impressive: The temperature gap widens to 114 degrees when the 42-below-zero wind chill in Northern Minnesota is included.