President-elect Donald Trump's second inauguration will mark the coldest presidential ceremony in more than 40 years.

More than 400 flights were delayed or canceled at Denver International Airport on Monday as a polar vortex continued to ...

A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

In Indiana, around zero degrees was likely, the map showed, with temperatures of around three degrees possible in Northern ...

Houston has been experiencing below-average temperatures as a polar vortex ushers in cooler conditions across the state.

MINNEAPOLIS, Minnesota — Our entire region is under an Extreme Cold Weather Warning until 12 p.m. Tuesday; wind chills could fall as low as -45 degrees. This Arctic blast is thanks to a polar vortex.

A polar vortex will plunge Waterloo region, Guelph and Wellington County into a deep freeze until Wednesday, Environment ...

Still, several Colorado school districts will start late on Tuesday as the state waits out the last of subzero temperatures.

An intense blast of arctic air blanketed the Mid-Atlantic and the Northeast with frigid temperatures, and a rare winter storm ...

Marylanders are bracing for the upcoming polar vortex, expected to bring temperatures into the single digits early this week.

A rare winter storm is getting set to slam the Gulf Coast and South, with cities from Texas to Florida under Winter Storm Warnings.