What other rhymes are there that basically mean "Ne'er cast a clout till May is out"?

I wasn't sure what to wear on a walk because the weather looked undecided, maybe warm but maybe windy, so I took a scarf just in case, and it occurred to me that there was a rhyme, the first line of which meant "if you're undecided", and the second and final line which ended in something like 'take a scarf' or 'put a scarf on'. But now I can't remember what the start of the rhyme was...