If May will be a gardener, he will not fill the granaries.
Look at your corn in May,
And you’ll come sorrowing away;
Look at it again in June,
And you’ll come singing another tune.
A windy May makes a fair year. (Portuguese proverb.)
Water in May is bread all the year. (Spanish proverb.)
A hot May makes a fat churchyard.
A cold May enriches no one.
A May flood