A month is a unit of time used in calendars, and its length can vary depending on the calendar system and the specific month. In the most commonly used Gregorian calendar:

• A month typically lasts 28 to 31 days.
• February is the shortest month, with 28 days in a common year and 29 days in a leap year.
• Other months have either 30 or 31 days :
  • 31 days: January, March, May, July, August, October, December
  • 30 days: April, June, September, November

Average Length of a Month

• Since a year has 365 days (or 366 in a leap year) and 12 months, the average length of a month is about 30.44 days.

If you want to know about months in other calendar systems or specific contexts, feel free to ask!