WASHINGTON—The polar vortex hit its peak across much of America on February 19, with an icy grip that made Arctic Greenland seem like a toasty vacation spot in comparison. Even Mars has been warmer ...

It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here ...

A "polar vortex" is bringing intense cold and heavy snow to large swaths of the US and Canada. How is this winter weather ...

Cold extremes are indeed waning over most of the midlatitude Northern Hemisphere, but a decade-plus debate on the Arctic’s ...

The coldest burst of Arctic air this season is coming to put an icy exclamation point on America’s winter of repeated polar ...

The tenth and coldest polar vortex of the season is blasting across the US this week. More than 58million Americans are under ...

Different weather forces in the Arctic are combining to push the chilly air that usually stays near the North Pole not just into the United States, but also Europe.