This is a paid asset, but now you can download Winter Suite Free.
Detail this asset from Unity Store: Original Link
Winter Suite v2.0.1
The Winter Suite gives you the keys for high quality rendering of your winter or cold environment. Currently used by published and in production games, the Winter Suite is composed by multiple products such as snow materials with advanced and dynamic properties and a frost camera effect.
WebGL : 1
Video : 1
Webplayer : 1 | 2
Features:
• Dynamic coverage and blending
• Rendering paths (Forward & Deferred)
• Advanced BRDF shading controls
• Transclucency (based on DICE’s model)
• Reflections
• Advanced camera frost effect
• Full source code included
• WebGL, DirectX 9, DirectX 11 and OpenGL
• Unity 5 support
New this version:
This is a reboot of the package which is now compatible with Unity 5. The package is now focused on Unity 5 as new coming features and updates won’t be supported on Unity 4.
You can find more about the package evolution on the Unity Forum thread and if you have some great ideas or requests, feel free to tell us !