73% Of US

 From TWC:

“73 Percent of the U.S. Covered in Snow, the Most Widespread Coverage in 17 Years”

Snow cover across the contiguous U.S. is the highest since at least 2003. Winter Storm Uri added on a large amount of this recent snow cover gain. A siege of winter storms since late January has contributed to the most widespread snow cover across the contiguous U.S. in at least 17 years. Snow was on the ground in 73.2% of the Lower 48 on Feb. 16, according to the National Operational Hydrologic Remote Sensing Center (NOHRSC). That's the highest snow cover extent for any day in the NOHRSC database dating to fall 2003, according to NOAA. Winter Storm Uri's snowfall deep into the South played a big role in this large expansion. Snow covered about half of the U.S. three days earlier prior to when Uri tracked from coast to coast. Parts of the Southeast and Southwest are the largest areas without snow cover right now. Some locations in central and western Dakotas also have no snow, which is an odd exception when compared to the rest of the northern U.S. Only one other year in the NOHRSC database has had snow cover 70% or greater, according to Steve Bowen, a meteorologist with the reinsurer, Aon. That was Jan. 12, 2011, when snow covered a broad area of the country, including the Southeast.

^ This is an interesting tidbit. ^

https://weather.com/storms/winter/news/2021-02-17-snow-cover-united-states-most-widespread-since-2003