I biked all last winter and can't say I'm looking forward to it again. I was really glad when spring came around and I didn't have to spend all that time dressing/undressing for rides. I biked every 2-3 days, thru 20F and even 0F, thru snow, and on ice (had some wipeouts).
So, what's an enjoyable alternative? Rec centers around here offer spinning classes, but that just doesn't seem that appealing. But maybe I should try it. I think I'd rather bike on the frozen roads though. Or I could get a trainer and do the same thing in my house, but for presumably cheaper.
What I'm really thinking about is taking up cross-country skiing and/or snowshoeing. Cross-country skiing probably sounds the most ideal, and the most like bicycling, with its fast descents. I think there's an extensive network of trails here, like the hut-to-hut system. It'd be cool exploring new areas.
And I may also try winter mountain climbing -- 14ers.