Is there a simple rhyme to help recall how many days are in each month?

Yes. Many children learn this simple poem to help them remember how many days are in each month. Although the origin of the lyrics to “Thirty Days Hath September” is unclear, the use of old English dates this poem to at least the sixteenth century:

Thirty days hath September,

April, June and November

All the rest have thirty-one,

excepting only February

Which hath but twenty-eight days clear

And twenty-nine in each leap year.