It seems that there are around 14-17K Google results on each of "雨を降って" and "雪を降って" keywords. Is 降る yet another intransitive verb that are used with を? Does it mean something like "rain on me" and "snow on me", or is it simply typo?
Some sample usages taken from Google results:
N.B. I don't think either "through" or "leaving something behind" interpretations can work with "を降る".