How Many Hours Are in A Month?

There are 12 months in a year, and each month can have 672, 696, 720, or 744 hours. It’s something we’ve all learned, but have you ever wondered why this is the case?

To put it into perspective, 672 hours is equivalent to 28 days. This is the typical length of February in a non-leap year. On the other hand, 696 hours, which is the length of February in a leap year, equates to 29 days. The months that have 720 hours amount to 30 days, while those with 744 hours add up to 31 days. This simple breakdown allows us to visualize the length of each month in terms of days.

  1. First month, January: 744 hours, 31 days.
  2. Second month, February: Usually 672 hours, 28 days. During leap years, it has 696 hours, 29 days.
  3. Third month, March: 744 hours, 31 days.
  4. Fourth month, April: 720 hours, 30 days.
  5. Fifth month, May: 744 hours, 31 days.
  6. Sixth month, June: 720 hours, 30 days.
  7. Seventh month, July: 744 hours, 31 days.
  8. Eighth month, August: 744 hours, 31 days.
  9. Ninth month, September: 720 hours, 30 days.
  10. Tenth month, October: 744 hours, 31 days.
  11. Eleventh month, November: 720 hours, 30 days.
  12. Twelfth and final month, December: 744 hours, 31 days.

Solar Year and Leap Year: Why We Have 12 Months in 1 year

We base our calendar year on the solar year, which is the time it takes for the Earth to orbit the sun once. But the Earth doesn’t orbit the sun in exactly 8,760 hours. It’s closer to 8,766 hours. To make up for these extra 6 hours, we add an extra 24 hours to our calendar every four years, making that year a leap year with 8,784 hours instead of the standard 8,760.

The History of February In Hours

Now, you might be wondering, why we add this extra 24 hours to February, making it 696 hours long during leap years, instead of just having a 744-hour month like many others? The reason has historical roots. The Roman king Numa Pompilius, who reigned between 715-673 BC, is credited with creating the 12-month calendar. To avoid any association with even numbers, which were considered unlucky, the king tried to make all the months odd-numbered hours. But to reach the 8,424 hours of the lunar calendar, one month ended up with an even number, and February, being the last month in their calendar, was the unlucky recipient of the short straw.

The Rest of the Months in Hours

Now, what about the rest of the months? Why do some have 720 hours and others have 744? Again, it’s thanks to the Romans. Originally, the Roman calendar had 10 months, starting with March and ending with December. January and February were added later by Numa Pompilius. To balance the total number of hours in a year, he alternated between 720 and 744 hours in the subsequent months. July and August, named after Julius Caesar and Emperor Augustus, both have 744 hours each to honor their greatness.


In conclusion, the number of hours in each month is a combination of astronomy and history. The Earth’s journey around the sun determines the length of a year, while historical figures and beliefs have shaped the individual months. So, next time you’re flipping your calendar to a new month, take a moment to appreciate the thousands of years of science and history that have gone into that simple page turn.

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