US weather: Boiling water to snow web craze
8 January 2014 Last updated at 11:42 GMT
Weather records have plummeted across North America, with the most extreme arctic blasts affecting about 190 million people.
Some parts of the US were as cold as -37C (-35F) - cold enough for boiling water to turn to snow when thrown in the air.
Many Americans have taken to social media to show off their demonstrations of the rare phenomenon.
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