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_20210906.nc 26.74 Mbytes 2021-09-08T16:09:33.975Z

NCEI THREDDS Server at NCEI see Info
THREDDS Data Server [Version 4.6.14 - 2019-07-23T11:04:31-0600] Documentation