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Don't you need a dry mouth to whistle? If you do, then maybe its because whilst in the shower, some of that water is entering your mouth...maybe...
What you need is a Whistler..... Here you are [ Invalid Attachment ] Hope you like it. But I'm afraid this one's no good in the shower either!
I cannot whistle at all, however the noise is made because your lips vibrate causing compressions and depressions in the air. Most people moisten their lips first to create a smoother edge for the air to flow through... I would guess that the excess water from the shower compromises this smooth edge making it more difficult to create the sound (though probably not impossible). Next year, try whistling without your head under the water.. if it still doesn't work then maybe the heat and humidity has an effect also (I assume sheep like nice warm showers)