Currently, when snow particles spawn high enough in the world and wind strength is high enough, it's highly likely that the snow particles will float over to other biomes. This results with a downpour of rain particles and a cloud of snow floating above it in the same biome. A way to prevent this would be a great.

I don't know if this is possible, but here are some ideas:
Remove the particle when it enters a non-snowy biome. I don't know all the possible conditions, but temperature and precipitation are some (I found this here).
Change the direction of wind exclusively for snow particles that enter non-snowy biomes.
Reduce the wind strength to 0 or near 0 exclusively for snow particles that enter non-snowy biomes.