Make both hands into a fist and hold them out in front of you so that the knuckles are visible. Now start on a pinky and count the knuckles and valleys between them. Knuckles are 31 days, valleys are 30 (and February). When you switch between hands it doesn’t count as a valley.
Left Pinky knucke: January, 31 days
Left Pinky/ring finger valley: February
Left Ring finger knuckle: march, 31
Left Ring/middle: April, 30
Left Middle: may, 31
Left Middle/index: June, 30
Left Index: July, 31
Right Index: August, 31
Right Index/middle: September, 30
Right middle: Oktober, 31
Right middle/ring: November, 30
Right ring finger knuckle: December, 31
Make both hands into a fist and hold them out in front of you so that the knuckles are visible. Now start on a pinky and count the knuckles and valleys between them. Knuckles are 31 days, valleys are 30 (and February). When you switch between hands it doesn’t count as a valley.
Left Pinky knucke: January, 31 days
Left Pinky/ring finger valley: February
Left Ring finger knuckle: march, 31
Left Ring/middle: April, 30
Left Middle: may, 31
Left Middle/index: June, 30
Left Index: July, 31
Right Index: August, 31
Right Index/middle: September, 30
Right middle: Oktober, 31
Right middle/ring: November, 30
Right ring finger knuckle: December, 31
I got halfway through that, then died of old age during a month that may or may not have 31 days.