RIFT, and more specifically in Trion's much-loved dimension system? If you answered yes, senior systems designer and meta-dimensioneer Lisa "Faratha" Boleyn has a blog post for you.
Boleyn explains how RIFT's weather is determined by where your character is standing, and consequently how this presented a problem when coupled with the fact that the game's raindrops and snowflakes "neither have nor respond to collision" due to performance considerations.
The solution for dimensional weather, then, is something called weather-blockers, which will be "brought live as craftable items" in RIFT's 2.6 update. Click through the links below to read further details.