At Dulles, the mercury plunged to 13 degrees, shattering the old record of 20 degrees set in 1990.
The average temperature over the contiguous U.S. fell to a frigid 19.4 degrees at 7 a.m. according to one dataset used by forecasters.
Here are cold weather preparedness tips to help through today, tomorrow, and Arctic outbreaks, no doubt, in the pipeline....
After a series of powerful early-November winter storms, snow extends as far south as West Texas on Monday morning.
The coldest weather since last February charges into the D.C. area tonight sending temperatures toppling to levels that would be below normal in January.
It's really cold in the Lower 48 this week, but that's only half the story.
If you compare the air flow this morning with next Tuesday morning, it's fairly easy to see why it's cold today, and why it's going to be colder next week.
Temperatures across the High Plains are running up to 45 degrees below average for this time of year.
Casper, Wy., bottomed out at 26 degrees below zero on Wednesday morning.
We favor another cold winter, not dissimilar to last winter. While we are forecasting less snow than last winter, we still expect slightly above normal amounts.