I am really into this whole March - In like a lion, out like a lamb thing! I keep going back to it. Have to say, it is a much better than my usual internet wormholes that normally end up with me reading long, detailed Wikipedia articles about serial killers.
Here are some other proverbs related to this month:
A dry March and a wet May?
Fill barns and bays with corn and hay.
As it rains in March, so it rains in June.
So many mists in March you see
So many frosts in May will be.
A Peck of March-Dust, and a Shower in May
Makes the Corn green, and the Fields gay.
March many-Weathers rain’d and blow’d
But March grass never did good.
I can't really get that last one to rhyme. How are they pronouncing blow'd so that it matches good? Also, it isn't a word, the past tense is blew. Really that one is just terrible. Lastly, there is an expansion on the well known one, that includes March:
March winds and April showers? Bring forth May flowers.
One of my favourite jokes as a kid was, "If April showers bring May flowers, what do May flowers bring? Pilgrims." Oh, so clever. (And distinctly American.)