A short rhyme to help you remember how many days there are in each month.
@brianbilston My aunt saved me the trouble of learning that:
Make a fist. With the forefinger of your other hand, touch each knuckle and each dip between the knuckles and count by month; start over when you get to your pinkyknuckle (July 31). So your forefinger is January (31), the dip between is February (28), the middle finger knuckle is March (31), etc... It works.