I wouldn't say it happens in a standard, regular pattern. Can it occur? Yes. Does it happen regularly? Once again, depends on whom you ask. It's never happened to me and I ride in the rain quite often. However, that's not to say it doesn't happen to others on a regular basis.

Normal would tend to infer that if your wheels don't retain water you're in the minority, which only a randomized controlled clinical trial would definitively conclude. As above in 2a: "according with, constituting, or not deviating from a norm, rule, or principle." I don't consider water retaining wheels to coincide with a set "rule" or "principle." Guess it depends which part of the definition of normal above you wish to adhere. I'm guessing as you view water in wheels "normal", you're biased towards 2b based on your personal experience.

You say tomato......I say I'm right