We have been pretty lucky so far this winter - since we don't live in the North East and haven't had to deal with a Polar Vortex! We haven't had sub-zero temperatures or even very many days of frosted windows. So how cold is it really in America?

The answer is - cold...really cold!

Parts of the U.S. are colder than Siberia or the surface of Mars.

There's a polar bear at a Chicago zoo who's hiding in her 40-degree habitat rather than freeze outside.

Many areas are at the point where antifreeze could freeze, at negative-34 degrees.

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