“The knuckles of the four fingers of one’s hand and the spaces between them can be used to remember the lengths of the months. By making a fist, each month will be listed as one proceeds across the hand. All months landing on a knuckle are 31 days long and those landing between them are not. When the knuckle of the index finger is reached (July), go back to the first knuckle (or over to the first knuckle on the other fist, held next to the first) and continue with August. This physical mnemonic has been taught to primary school students for many decades.”
I don’t know why the months have the number of days that they do. They probably explain it in the Wikipedia article to which the above photo links. But I will not read that Wikipedia article. What I will do is say that the current distribution of days is a pain in the ass, and is unnecessarily retarded. My favorite month is December, and I also like fall.