Record-breaking cold hits half of the US

More than 200 million Americans were under winter weather advisories on Thursday night due to the icy and snowy conditions.

Wind chill records set over the weekend; how the formula was

Nationwide temperature divide putting more than 100 records in

Why extreme cold weather events still happen in a warming world

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25 million under wind chill alerts as record-breaking cold

All-time January heat records fall as astounding warmth hits North

Why extreme cold weather events still happen in a warming world

Understanding the Arctic polar vortex

Cold Weather Forecast: Arctic Blast to Bring Frigid Temperatures