Living here in Michigan, people will do crazy things when they start preparing for winter. For example, people with trucks or rear wheel drive cars (who drives those anymore) might put sand bags in the back for added weight. They can also empty out some of the sand into the ground in front of the tires if they get stuck. Others will put blankets, candles, and boots, and an extra set of clothes in their car in the event they end up in a ditch.
Houses in Michigan are also subject to changes. Just today, I put the plastic shrink rap window film on the inside of my windows. Back in October, I pulled all the window AC units, closed the vents to several unused rooms, tuned up the furnaces (yes, we have two of them), put rope caulk around two of the doors that we don't use during the window (yep, two doors too), and put an insulation pad around the water heater. I also spent two full days in the attic with several cans of fire rated "Great Stuff" sealing up any holes in the 2nd floor ceiling where light fixtures, vent stacks, gas lines, or wires rise up into the attic floor. Downfall is I am sure that I missed most of them, so next summer, I will take a few days and go extreme and make sure that the house is as tight as possible.
What do you do to get your house and car ready for winter? Do people in the south do much of anything?