Should I be worried about snow? Will be arriving in Rome then driving to Adriatic Sea, Tuscany, Umbia and Venice.
Considering the weather then, you might want to train rather than drive. Is that an option, or do you have to have a car?
'except for the Alps, snow is rare if nonexistent'
must mean that all the ski resorts listed here (except those in the Alps) are now defunct:
http://www.j2ski.com/ski_resorts/Italy/Italian_Ski_Resorts_Map.html
Jackie, you can get through the passes in the central mountains without any trouble since you'll be below the snow line.