If your're using North yankton map mod or LC snow mod or any other snow maps than you should use these setting, this setting will replace Rain with Snow.
there is no FPS drop or any other bugs.

Weathers:
Light snow
Heavy snow
foggy snow
Storm

How to install:
Replace all files in pc/data and pc/textures folder.
If you think snowflakes are too visible or hard than replace fx_rain.wtd with the one from Soft Snow Flakes folder


All credits go back to Flash.