I have a fat bike that I ride all winter long. Two weekends ago, I took it for a ride while snow was falling and drove to the trail with it on the carrier on the back of my truck. After I got home, I put the bike in the garage and forgot about it. Yesterday, I took it out and the chain was a rusted mess from the melting solution they spray on the roads around here. I ended up removing the chain and shaking it in a container of Spray Nine. Thankfully, it was relatively new so it came clean. I re lubed it and put it back on the bike.
I use this weather as an opportunity to refresh my Dahon folder that I commute on. Since I don't use it when it's icy, I take it all down, service the hinge on the frame, replace the tires, brake pads, cables and whatever else it needs to give me a zero breakdown commute for the rest of the year.
My other bikes are clean and lubed enough to sit idle all winter.