I'm in Jersey and I drive mine all year round. If it's sunny and no salt or anything on the roads who cares if it's 30 degrees , I drive it. Yep, my heater works fine..
Last year I was out Christmas eve and New Years day in the afternoon. My wife said "now where are you going", my reply was to give the old 'Cuda a little work out....
My neighbor thought I was going to the track....