Officially winter doesn’t start in the northern hemisphere until December 21st but Canadians know differently. This year especially has seen an early start to the snow season, at least in central Canada. Both Canada and the United States have websites indicating snow levels for their countries. The American one is operated by the National Weather Service
and offers both static
maps depicting snow depth, snow water equivalents and other measures. Data generally ends at the U. S. border with some exceptions. Also included on the site are some kml overlays
for use with Google Earth
.State of the Canadian Cryosphere
is a site with similar datasets and images but covering Canada and, in some cases, North America. Daily snow maps, are, however, a few days behind.