Abstract: A method of controlling operation of an adjustable shutter in a vehicle includes operating the shutter between and inclusive of fully-opened and fully-closed positions to regulate an amount of ambient air flowing into the vehicle. The shutter is arranged relative to a vehicle grille opening that is adapted for receiving the flow of ambient air. The method also includes sensing via a moisture sensor a level of moisture in the ambient air. The method additionally includes selecting a first predetermined position of the shutter when the level of moisture has reached a threshold moisture value to alter the amount of ambient air flowing into the vehicle through the shutter. A vehicle using a controller to perform such a method is also provided.