A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans. See maps of the arctic blast.

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into next week, impacting millions of Americans in nearly all of the contiguous states.

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with Donald Trump's inauguration expected to be the coldest in 40 years.

According to the National Weather Service, a polar vortex will impact most of the country this weekend, here is what you need to know.

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.

AVERAGE LOW FOR JANUARY 18th: 15° SATURDAY’S SUNRISE: 7:32 AM SATURDAY’S SUNSET: 5:04 PM Elmira, N.Y. (WETM) – A polar vortex brings in freezing temperatures into the work week. Otherwise, we will see a lot of sunshine for the work week.

Over 120 million Americans will face extreme cold, with temperatures potentially reaching minus 40 degrees Celsius. Meteorologists warn that it will be colder than in Greenland. Due to the frigid weather,