Don't rain on my parade. (Barbra Streisand)

You might like to have a look at the meaning of rain in slang terms and expressions. However, don't knock the weather; nine-tenths of the people couldn't start a conversation if it didn't change once in a while. (Kin Hubbard) 
According to Ilka Chase, Among famous traitors of history one might mention the weather. So what really happened to the Spanish Armada?

P.S.  In her autobiography Past Imperfect, Ilka Chase also wrote Those who never try never fail. How very true!