You really don't
need a huge amount of extra gear for winter.
At least for me it's
nearly the same as in mid-Sept.
Here's a map:
http://picasaweb.google.com/yosemite.chick.on/VernonXmas#5556483112022317010(you can zoom in and see the gory detail)
Hopefully fishguy sees this.. interested in his progress...
(if you read in that thread... you can find youtube links to
the wife snow shoeing for the uninitiated... shows how
much of a pain and slow going it can be)
Have fun