I've had numerous drop tops, and I too like to keep my top down as much as possible. People look at you funny when it is -10 and you have no roof...haha
A few of my buddies when we were young and dumb...we drove around in light rain,-5 with the convertable top down through fields, back roads and main streets. Man were we sick the next day...we blamed it on the damp cold weather, but being Canadians that wasn' t entrely true. Later we realized it might have been the homemade Dandilion wine..hehe