The humidity should not make a difference on the temp on the Spyder... It does make a difference on the temp YOU feel....evaporative cooling in a dry climate, and the lack of it in a humid climate is what YOU feel . Unless the outside of the radiator is wet.... should not make a difference on the bike's operating temp. I have often wondered if the denser wet air would actually transfer more heat from the radiator than less dense dry air at the same temp.....