At least 38 deaths are now linked to a severe Arctic freeze that is pounding the US and Canada.
Officials say 34 people have died across the United States, with Buffalo, New York, the worst-hit area.
Four people were killed in Canada when a bus overturned on an icy road near the town of Merritt in the western province of British Columbia.
The scope of the winter storm has been unusual, stretching from Canada south to the Rio Grande.
Forecasters say the storm will ease over the next few days but advice remains to avoid travel unless absolutely necessary.
The storm has wreaked havoc for several days, but power has been permanently restored after earlier outages.
Fewer than 200,000 customers were without power as of Sunday afternoon EDT, down from a peak of 1.7 million, the Associated Press reported.
Thousands of flights have been cancelled, preventing many people from reaching their families for Christmas.
More than 55 million Americans remained under a wind chill alert on Sunday.
“Bomb cyclone” winter storms — which occur when atmospheric pressure drops, bringing heavy snow and winds — have affected travel across the United States.
New York State Governor Kathy Hochol – who is from Buffalo – said: “This will go down in history as Buffalo’s most devastating storm.”
“It’s [like] going into a war zone and the cars parked on the side of the road are shocking,” he told reporters on Sunday evening.
He said residents still faced an “extremely dangerous life-threatening situation” and anyone in the area should stay indoors.
Twelve deaths were confirmed in Erie County, with some victims found dead by cars or snow banks.
Storm-related deaths were also reported in Vermont, Ohio, Missouri, Wisconsin, Kansas, and Colorado. South Florida’s temperatures dropped so low, that iguanas froze and fell from trees.
The western US state of Montana is the worst hit by the cold, with temperatures dropping to -50F (-45C).
In Canada, the provinces of Ontario and Quebec are bearing the brunt of the storm.
In Quebec almost 120,000 customers were without electricity on Sunday. Officials say it some could take days for some households to be reconnected.
