I found a list [1]:

     a. sunshower (34.29%)
     b. the wolf is giving birth (0.04%)
     c. the devil is beating his wife (6.43%)
     d. monkey's wedding (0.16%)
     e. fox's wedding (0.15%)
     f. pineapple rain (0.03%)
     g. liquid sun (0.74%)
     h. I have no term or expression for this (55.15%)
     i. other (3.02%)

[1] http://www4.uwm.edu/FLL/linguistics/dialect/staticmaps/q_80....

From Texas here - I've heard someone use it. Though their version was "God is beating his wife" instead of "the devil". I heard it as a kid, from my neighbor's dad, when my friend and I were outside playing and it started to rain while it was sunny.

I'm pretty sure I've at least heard that "devil beating his wife" thing once in my life, somewhere... but in terms of routine, daily life, I know of no term for that phenomenon that's common place. shrug

I live in Louisiana. I have heard it from several people.

Also, here is a localized scene from a video game that uses it http://www.youtube.com/watch?v=Pk024-oaFv4

Well unless you live in one of those green regions, that is kind of the point.

I'm from South Louisiana. My grandma has told me this from the time I was a young child and it still comes to mind. Went through my head just today, in fact, during an afternoon shower.

I have always heard it referred to as "a monkey's wedding." Though I think that came from my dad who grew up in apartheid South Africa, so it might be racist...

My mother would say that "the witches are getting married".