I have been playing around with procedural snow in geonodes, which wasn’t too complicated, afterall. Blend file included (with shaders, without HDR) for whoever may be interested.
sneeuw.blend (1.1 MB)
Ahhh it snowed on my poor dog!
The Idea is good, to make it more useful you need a geometry input (instead of creating the geometry in the node group) and a few inputs for tweak parameters (thickness, coverage etc.)
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Thanks for your appreciation, and those are good suggestions; I’ll take them into account in a next version :-))
Yes it is important to note that where geometry nodes really get useful is when you reuse them. As with any modifier.
So once you take the time to make a node to put snow on an object you can re-use it to put snow on any object (or collection) in the future. 
You both are in the wrong timeline… 
