Donald Trump’s swearing-in ceremony and inaugural address will be moved inside the U.S. Capitol due to the freezing cold temperatures forecast for Washington on Monday, scrambling the tightly choreographed event days before the president-elect is set to take office.

President-elect Donald Trump moved his inauguration ceremony inside for Monday due to an "Arctic blast." How cold will Florida be?

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.

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is about to bring even harsher arctic blast to nearly 300 million Americans starting this weekend. Maps show where and when the cold front will arrive.

Despite a cold start to the day, most of the U.S. will experience seasonably mild temperatures on Thursday. However, dangerous changes are on the way as a polar vortex tightens its grip on the nation as sends temperatures tumbling below freezing starting this weekend.

A winter weather advisory has been issued for Denver as an arctic blast is pushing through Colorado. Below-freezing temps are expected for 115 hours straight as wind chills dip to -30° in Colorado.

Dangerous wind chills will hammer Colorado over several days as the possibility of a flash freeze in Denver could impact the Friday evening commute. Here's the updated wind chill forecast.