A friend of mine was telling me the other day how happy he had been before "the rains came". There's something beautifully biblical about "the rains". It suggests a divine curse that cannot be lifted until some terrible expiation is made, probably involving a hecatomb of umbrellas.
Anyway, I shall therefore link you straight to this article that appeared on the BBC website today on strange words for the water that falls out of the sky, and never stops. I would merely like to add the term ark-building weather.