The number of days in a month varies depending on the month. Most months have either 30 or 31 days, except February, which has 28 days in a common year and 29 days in a leap year. The average number of days in a month is about 30.44. Here is the breakdown:
- January: 31 days
- February: 28 days (29 in leap years)
- March: 31 days
- April: 30 days
- May: 31 days
- June: 30 days
- July: 31 days
- August: 31 days
- September: 30 days
- October: 31 days
- November: 30 days
- December: 31 days
The average length of a month, considering a year has 365.2425 days, is approximately 30.44 days.