The criteria that must be met in order for a Christmas to be considered a white one is that there must be at least one inch of snow on the ground on Christmas Day. This official measurement is usually taken around 6 am on December 25th.
While most areas of the lower 48 can only hope for a white Christmas from year to year, residents of northeast MN, the Upper Peninsula of MI, and northern New England are nearly assured of having a white Christmas each year. This year, most of those areas aside from northern New England are on track towards a white Christmas. If you are wondering what area of the country will see the deepest snow this Christmas, look to the northern Cascade Mountain Range in Washington State. A reporting station near Brown Top, located in the North Cascades National Park, is reporting a snow depth of 294 inches (24 and a half feet). That may seem like a lot, but it's well short of the record snow depth for North America. That occurred back on March 11th, 1911, in Tamarack, CA. On that day, a whopping 453 inches was measured in this town on the western slopes of the Sierra Nevada mountain range.
Closer to sea level, white Christmases can be much harder to come by across the lower 48. To see what your percentage chance of having a white Christmas is, open this map and click on the circle nearest to you.
To view a map of the current snow depth in the lower 48 click here.