I just came across a random comment about how a person could never remember which months had 31 or 30 days.

Never again will you have this problem.

Starting with either hand, on the index fingers knuckle is January with 31 days. Between knuckles are the months with 30 days (or less). The pinky knuckle on the first hand will be July, with 31 days, August will be the Index knuckle on your second hand, again with 31 days.