Forecasters have said parts of the U.S. can expect frigid temperatures in December. A first round has arrived, and more cold ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

More than 18 million people across the West and Midwest are under winter weather alerts in the United States.

Bitter cold is taking hold across the U.S. on Thursday, with millions waking up to freezing temperatures and in some areas, ...

Low temperatures will bottom out into the single digits in many towns Friday morning as wind chills could drop to near 0°.

Some sates saw subzero temps. Here's how cold it got in all states, and why it got so cold.

First Alert Weather Day is in effect Monday in the mountains as a winter system brings snow to higher elevations.

A blast of Arctic air gripped much of the central and eastern portions of the U.S. on Friday in sub-freezing temperatures ...

Arctic air spills in overnight Wednesday with Thursday morning wind chills near zero for some.

It was so shockingly cold that there were short-lived fears of a new ice age. Scientists think human activity contributed to ...

A late-November cold snap sent temperatures in Minneapolis so low that, for a short time, it was actually colder than Mars, ...

As we enter the winter months, cold fronts move into the spotlight in our weather forecasts, bringing shifts in temperature, ...