This is a paid asset, but now you can download Realistic Snow and Fog FX Free.
Detail this asset from Unity Store: Original Link
Realistic Snow and Fog FX v1.2 (Latest version)
Realistic Snow and Fof FX is a package containing 2 versions of snow, one for PC/Console and one for mobile.
Features:
• NEW! Added fog particles like the ones presented in the video.
• NEW! Added HDRP Template version 7.1.8 for Unity 2019.3.x.
• NEW! Added URP Template version 7.1.8 for Unity 2019.3.x.
Content:
• 4 snow particle effects Mobile/PC
• Demo scene
• Added a new shader, for HDRP template
• 2 Fog particles
To achieve the camera effects presented in our screenshots, you will need to import Post Processing Stack 2 in your project by using the Package Manager.
Scene presented in the video is NOT included! You can buy it separately here.
For more information, you can check the documentation.
For any questions or further information, or if you need some tweaks/adjustments regarding the particles please drop us a line here.