Winter weather is notoriously bad for car sales; short days, bad road and visibility conditions, and the salt and slush-stained cars you see driving around the city don’t exactly make people eager to test drive a brand new model. Just about every retail sector takes a hit after the holidays as credit card bills and cold weather encourage people to go into hibernation mode, but auto sales are hit particularly hard. There are also some pragmatic reasons for the winter slow season, too, as anyone who’s invested in winter tires isn’t likely to want to trade-in until the snow stops…