ANY snow, even three flakes spotted by one person as they drift down - DOOM! No one here knows how to drive in snow - but they do know how to drive in dry sand and mud.
One year here in North Florida it got down to 8 F with ice storms. I was downstate and drove back since the people taking care of the farm were panicked. The entire state was shut down from Gainesville north. I had trouble finding gas to make it home. The ice encased trees were kind of neat on the highway between Perry and Tallahassee - not something I ever want to see again. The thermostat that let hot water circulate to the heater core was stuck so we had no heat in the car.
When I got home, the people running the farm could not figure out how to chop holes in the ice on the water troughs so the horses could drink. We had to do that several times a day until the temps warmed up.
Our worst problem was our house - we'd drained the pipes before we left but had left a faucet running in the hopes the well wouldn't freeze. Apparently it didn't freeze for quite a while - there was a sheet of ice down the hill for 100 yards. That wasn't the problem. The smarter dog had gotten cold, even though he and his buddy had a nice warm nest in the hay stall in the barn. He pulled the supply vent loose from the house and was sitting inside the tube nice and toasty warm. His buddy was at the barn and was cold all by himself.
The house was less than 35 F and getting colder. It took days to get someone out to reconnect the vent properly so my husband crawled underneath and hooked it back up, kinda. It was so cold the glue on the duct tape wouldn't stick.