They had rain at the hillclimb race I run over in Robbinsville (well, when I have a car that moves, anyways). 10 people wrecked bad enough on the first day that they were out of the competition, including the more experienced drivers. The guy who won was driving a $500k Pirelli World Challenge Porsche cup car, and ran an absolutely stupid time (he nearly tied the course record IN THE RAIN, and he is the current record holder with his old Porsche cup car).