Snow shower are present in live weather, sadly, there is no snow accumulation. I am sure it will happen one day because the sim is able to add snow with a very quick and effective shader and Meteoblue has the data about snow accumulation during the shower and the data about the snow layer which is already on the ground, their model could even let you see the snow melting during the day…
One day we will have a real white Christmas but probably not this year.
EDIT: I just read that white Christmas could indeed be this year in the next update !!!