I think you'd be happier sticking to the Long Trail and bonafide hiking trails for lots of reasons. And, you wouldn't be in danger at putting the Catamount Trail at risk for violating the conditions under which it's maintained.
A quick review of the Catamount Trail forums reveals that there are portions of the trail for which easements specifically are for winter use only. Additionally, a lot of the trail is not maintained for summer, for example, is wet or swampy and thus usable only when frozen.
http://www.catamounttrail.org/forums/posts/general-discussion/summer_hiking_on_catamount_trail/
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