@3run: How did you manage to let it only rain outside?
I use region_check for the particles, so I place a region called let's say "no_rain" above the celling, so the rain won't pass throw it. Plus, I use those 'mist' particles, at the place, where I remove rain drop particles, so it looks nicer, here few screens:
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The same technique with regions was used in the template, provided by MasterQ32 some time ago.