Impossible. Snow in game don't have unique shaders, so no way to make it look like snow. But if you mean that star (or whatever it is), you can make it in creation kit as particle.
Tonaran
I don't have the problem and this means that even this new system is too much complex to understand (except me because developed it) and you asking even harder brainfucking features?It doesn't work then. After half of a minute settings file switches to enbseries.ini.