I'm in Bellingham and all my bikes live in a similar environment (carport converted to garage - no insulation). I've had steel bikes and haven't noticed any issues. Never felt like components showed any impact. It never really feels damp in there. I personally would not worry about having a nice bike in a shed like that around here.
I don't think we have the right kind of humidity here for this to be an issue. (like, if its humid, it raining, not hanging in the air). But that's a completely unscientific (and probably fairly absurd) statement.
The only issue is when I don't dry off my cross bike or something, it will stay wet and the chain will rust, etc. But, you're probably not riding the vagen in the rain anyways.
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