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

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

The polar vortex is a ring of cold air that typically circles the Arctic. A strong jet stream essentially acts like a fence, ...

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

Some areas of the U.S. may see temperatures as low as -20 or -30 degrees early next week as arctic air from Siberia rolls in.

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...

A new blast of Arctic air sweeping from north to south will bring bone-chilling temperatures to millions of Americans this weekend and next week.

Temperatures are expected to plummet over the weekend, bringing life-threatening conditions to large stretches of the United ...

A brutal polar vortex is set to bury the Big Apple in snow Sunday and then deliver deadly single-digit temperatures that will ...

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with ...

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...