One of my friends who lived in Israel explained that, of course, precipitation during the "winter" months is vital and it is considered a great blessing from G-d. This we know is alluded to several times in the Torah, for example in the 2nd paragraph of the Shema, among other places.
But my friend said that rain is an immediate blessing, whereas snow is a "deferred" blessing because one must wait for the snow to melt to receive its rewards.
This is an obvious "scientific" explanation. But, I'm curious if any Jewish source such as Talmud, a commentary, a rav, etc. may have mentioned or alluded to this idea. This may be a "wild guess", and just my friend's statement, of course.