https://blendermarket.com/products/quick-snow

Quick snow is an add-on for blender to create dynamic snow over any objects by controlling over the shader.  In Just one click make your entire scene covered with snow.It's a plugin to control over your entire scene, every objects and every material with a variety of features to control over your shaders.  The materials are 100% compatible with Cycles and Eevee. 1K,2K and even 4K textures are packed with full PBR workflow.With the power of Geometry nodes we are able to create snow mesh in no time.