Well, i know that musketeers don't suffer the same steep weather penalties that arques and sam archers do... maybe it is the case that now muskets work occasionally in heavy rain.

I have also noticed that a particular weather condition does not hold constatnt throughout the entire day. In other words, in light rain, it will rain for a bit, then slow almost to a stop, then start again, etc.... lol, maybe it slowed up for a bit.

And, as it has already been stated, it wouldn't be uncommon for firing holes to have been made in the walls (which weren't exactly made of concrete back then) for castle defense.

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