Bitter cold continues to blanket the northern United States and Canada, as forecasters warn the deep freeze will continue into the start of the new year.
In Canada, officials say parts of the country are colder than the North Pole or Mars.
Weather observers say the temperature on top of the highest peak in the US north-east hit -37 degrees Celsius, a record low.
The previous record at the Mount Washington Observatory in New Hampshire was -35C and was set in 1933.
The observatory has posted a Facebook video showing weather observer Adam Gill emptying a kettle of boiling water into the air, where it immediately turns to snow in the cold and hurricane-force winds.
Instagram user Amy Fogarty, from Duluth, Minnesota, posted a similar video of her tossing a pot of boiling water into the air outside her home.
The water froze mid-air and fell to the ground as ice.
Bitter cold weather has taken hold of much of the northern United States.
Wind chill advisories or warnings were in effect for much of New England, northern Pennsylvania and New York on Thursday.
Forecasters warn of hypothermia and frostbite from arctic air settling in over the central US and spreading east.
More snowfalls are expected, and forecasters say high winds are pushing temperatures down even further.
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