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

Dataset Size Last Modified
     Folder  Snow Cover Extent (Northern Hemisphere)   --
         nhsce_v01r01_19661004_20181203.nc 25.61 Mbytes 2018-12-05T05:39:56Z

NCEI-NC THREDDS Server at NCEI see Info
THREDDS Data Server [Version 4.6.11 - 2017-12-04T16:22:46-0700] Documentation