I don't mind at all, it's a perfectly reasonable question. Ah--! [He accidentally crushes his snowball and has to start over. Look at him go!! He is the snow master. At least it's easy enough to fix.]

Eldar's sun is very near the end of its life cycle, you see. When a sun becomes a red giant, as ours has, it radically changes the environment of planets within its system. Eldar is close enough that it has long since become too hot for snow to fall.