I'll ride as much as the weather allows this winter. Not going to push my bikes through the salty sludge that lays around. Cold does have a way of sapping energy. Too much clothing you overheat; remove it and you freeze. Some people love the cold, though.
We have a spin bike here that we bought used when my wife's spin classes got shuttered months ago. I plan on using that when the cold/snow/ice is too much to venture out. Never spun before, so it should be interesting.