Another Floridian here. If you leave your razor in the bathroom then you might want to put a coat of oil on it if you're not using it daily.

Otherwise I keep my razors in a relatively dry area of the house and the only ones I coat with oil are my special few that only come out once or twice a year. I think a razor used daily can get by without needing oil as long as you take care of it before and after a shave. If you do see any oxidation starting to form then clean it up and know that you should either use oil or store them in a different spot.