I gave away my car and ride year around.

I ride in blizzards that stop everything except me and the sanding trucks.

Two bikes.

My winter bike, which I ride only with visible ice and snow on the road, has studded Nokian tires and fenders.

Otherwise, I ride my summer bike with an Aramdillo in back and a Conti 4 Seasons in front.
It doesn't matter if the back tire slips, but it means everything if the front tire goes out from underneath me.