I just installed a sensor outdoors in my porch. I don't have to worry about rain, we will see how it does with humidity. However, I am just using it to "inform" not to trigger my alarm (basically to take a picture/video when someone approaches the door). I would be worried about installing a sensor outdoors that could result in false alarms, but I think it is perfectly ok (with a protecting box or not, like in my case) if you will just inform your system of the movement.
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