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A month is not a fixed number of days, and any particular calendar month may be 28, 30, or 31 days in length (29, 30, or 31 in leap years). A month can also be defined as 1/12th of a year, but again this is not an even number of days (the average is 30.4 days).

There are 7 months with 31 days, 4 months with 30 days, and 1 month with 28 days.

30 days: September, April, June, November

31 days: January, March, May, July, August, October, December

February is the only month that has 28 days, but has 29 in leap years (which have 366 days)

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7y ago

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