In the order they appear through the year, the months that have 31 days are:
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These are the months in order and their number of days. January - 31 February - 28 or 29 depending on whether it is a leap year or not. March - 31 April - 30 May - 31 June - 30 July - 31 August - 31 September - 30 October - 31 November - 30 December - 31
5 months don't have 31 days, 7 months do. February has 28, or 29 in leap years. April, June, September, and November have 30 days.
Most months have 31 days. So if you divide 503/31 you get 16.22 months. So approximately 16 months.
Count your knuckles. the hump are the months with 31 days, and the spaces are the months that have less than 31 days. February is the only month that has 28 or 29 days.
May has 31 days. The following months also have 31 days: January March July August October December So including May there are 7 months which have 31 days.