WASHINGTON — President-elect Donald Trump announced on social media Friday that his inauguration will be moved to the Capitol Rotunda due to the cold weather expected to hit the nation's capital on Monday.

Inauguration Day is usually chilly, but Monday is looking especially cool. The maximum temperature is expected to be about 20 degrees and the minimum temperature is 6 degrees, with strong winds.

The last time a ceremony was held indoors, Ronald Reagan's second inauguration, the temperature was just seven degrees; that year's parade was also canceled. Former President Barack Obama's first inauguration in 2009 was the only time the temperature fell below freezing on Inauguration Day.

Trump announced on the social media platform: "In addition to prayers and other speeches, I have ordered that the inaugural address be delivered in the rotunda of the United States Capitol Building, just like Ronald Reagan used in 1985, also because of the extremely bad weather. Cold.”, Truth Society. "Various dignitaries and guests will be brought into the Capitol. It will be a great experience for everyone, especially the large television audience!"

"The Arctic blast is sweeping across the country. I don't want to see people hurt in any way," he added. "This is a dangerous environment for the tens of thousands of law enforcement officers, first responders, police K9s and even horses, as well as the hundreds of thousands of supporters who will be outside for hours on the 20th (if you Decide to come and dress warmly!)”

The change would deny Trump the chance to draw large crowds on the National Mall to watch him take the oath of office — a disappointment for a man obsessed with crowd sizes.

Trump will hold an indoor rally at Capital One Arena in downtown Washington on Sunday.

In a Truth Society post on Friday, he also announced that supporters could also watch the inauguration from the arena on Monday.

"We will open Capital One Arena on Monday to watch this historic event live and host the Presidential Parade," he posted. "I will join the crowd at Capital One after being sworn in."

The venue can accommodate up to 20,000 people, far less than the National Mall. Permits filed for the inauguration estimate there will be approximately 30,000 people in ticketed areas and 250,000 in public, non-ticketed areas.

The chance of spectators watching any of the inauguration on the National Mall on Monday appears increasingly unlikely, a senior administration official with direct knowledge of the situation told NBC News on Friday night.

The official, who spoke on condition of anonymity, said some of the fencing began to come down after Trump's announcement and officials did not plan to broadcast any inauguration events on screens on the National Mall.

Several Trump supporters who had arrived in Washington ahead of the inauguration told NBC News on Friday they were disappointed with the news.

"We made all the plans and all the arrangements to come to this event," Jose Granado, who traveled from Miami, told NBC News.

"We're prepared for the weather, it's not a problem," said friend Jorge Gonzalez.

"We might as well stay home and watch TV. I'm a little disappointed, to be honest," said Ken Robinson of Oklahoma. "We're here to see it in person. We really don't want to see it on the big screen."

"The cold never hurt anyone," said Harry Troyer, who traveled with Robinson. "We have a farm and we can't stop feeding the cows just because it's cold."