I keep this stuff in my trunk: jumper cables, tow cable, 12v air compressor, antifreeze, oil, water (leave this out in the winter), highway type flares, duct tape, rope, etc. I use the jumper cables very seldom, but car batteries don't do as well in the cold. The tow cable can come in handy for pulling other people out of the ditch. Keep a wool hat & gloves in the car. Weather can change quickly from reasonably pleasant to very bad. BTW, I'd like to hear from the people in the Great White North who have -28C weather.