Rain does not have one sound. A closed window softens detail and places the weather beyond the room. A timber roof brings a wider, warmer texture overhead. Canvas places every drop close to the listener.
Window rain
Window ambience combines fine drops on glass with the deeper sound of rain outside. The room tone matters because it creates the sense of safety between the listener and the storm.
Roof rain
Roof material changes the entire balance. Timber, tile and metal each shape impact, resonance and distance in a different way.
Tent rain
Canvas rain is close and detailed. A believable tent world also needs forest depth, restrained wind and enough variation to avoid mechanical repetition.