National Centers for Environmental Information / National Operational Model Archive and Distribution System Catalog https://www.ncei.noaa.gov/thredds/catalog/cdr/snowcover/catalog.html

Dataset Size Last Modified
     Folder  Snow Cover Extent (Northern Hemisphere)   --
         nhsce_v01r01_19661004_20220103.nc 26.87 Mbytes 2022-01-05T13:22:14.600Z

NCEI THREDDS Server at NCEI see Info
Documentation