Hi. This will be caused by deteriorating, or defective weather stripping. During driving, air is pushed through worn, or damaged weather stripping, thus, creating this whistling sound you are hearing in the passenger compartment. Water allows the small hole, or cracks, to emit the sound at a louder rate. This could be a manufacturing flaw(poor weather stripping installation, or defective composite). This is repairable, but you will need to locate the worn weather stripping. Once located, and exposed, you can order a replacement weather stripping kit from your dealer.
NOTE_ Most common location will be the front windshield weather stripping. the rear window, and side windows are to be checked, as well.
Do have those deer warning mods on your car? if not have you placed any upgrades on your car? street stuff etc?
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