It looks like you're new here. If you want to get involved, click one of these buttons!
I have seen YouTube videos that used Particle Systems to create rain and snow.
I was successfully able to add rain to one of my levels.
But with snow some older versions (in the YouTube videos) have configurations that are nowhere to be found in 2018.2, the version that I am using.
So I am mentioning the particular Editor and asking how to do it.