This is something you don’t see every day. We recently heard that Canada had a white Christmas EVERYWHERE, the first time in four decades. Here we see that the USA has an increased albedo (surface reflectivity) for about 1/2 of it’s land area. The increased albedo combined with low sun angle this time of year conspires to keep ice and snow unmelted.
Look for a long and extended winter weather pattern as we head towards the spring equinox, which can’t get here fast enough.
Here is a more colorful view of snow depth on Dec 25th from the National Hydrologic Remote Sensing Center:
Click for larger image
Jim G reports in comments:
On Dec 18th, the coverage was 59.4%
h/t to Ron de Haan and Fresh Bilge