Even though I think the slang is dated, it still gets used facetiously.
And also 'pure as the driven snow' = virginal, and it makes me think of that. I'm not really seeing it being namey enough to appeal to me, personally. It's not horrible though.
Rain, Snow,
Sunshine,
Storm... whatever.
Also I don't care for the SN- sound in names. Or the NO sound. So the sound turns me off.