Since you can't ride the tandem, sell it and get a winter bike. Or XC skis. That's what I would do if I lived in a snowy place. XC skis, a studded tire mountain bike, and snowshoes.

Okay, so maybe I'm a little nostalgic for winter. I've been collecting my winter supply of kindling for my wood stove, but I haven't gotten any firewood yet. Soon.