What is the longest month of the year?
There are 7 months with 31 days, making them the longest by day count — January, March, May, July, August, October, and December.
Key Detail: All these months have 31 calendar days, which is the maximum length any month can have in the Gregorian calendar.
Quick Facts & Explanation
The longest months of the year are the ones with 31 days.
Even though all months are roughly the same in terms of weeks, 31-day months have 3 extra days compared to February (which has only 28 or 29 days).
Comparison Table: Month-by-Month Breakdown
| Month | Number of Days | Number of Weeks (Approx) | Longest? |
|---|---|---|---|
| January | 31 | 4 weeks + 3 days | ✅ |
| February | 28 / 29 | 4 weeks | ❌ |
| March | 31 | 4 weeks + 3 days | ✅ |
| April | 30 | 4 weeks + 2 days | ❌ |
| May | 31 | 4 weeks + 3 days | ✅ |
| June | 30 | 4 weeks + 2 days | ❌ |
| July | 31 | 4 weeks + 3 days | ✅ |
| August | 31 | 4 weeks + 3 days | ✅ |
| September | 30 | 4 weeks + 2 days | ❌ |
| October | 31 | 4 weeks + 3 days | ✅ |
| November | 30 | 4 weeks + 2 days | ❌ |
| December | 31 | 4 weeks + 3 days | ✅ |
| Criteria | Longest Month(s) |
|---|---|
| Number of Days | 31 |
| Number of Long Months | 7 |
| Calendar Months | Jan, Mar, May, Jul, Aug, Oct, Dec |
How many days are in the longest month?
Exactly 31 days, which is the maximum number of days a month can have in the Gregorian calendar.
Is January the longest month of the year?
Yes, January is one of the longest, but it only feels longer because it comes after the holidays and has 31 days.
Is December a long month?
Yes, December has 31 days and is one of the longest months by day count.
Is July longer than June?
Yes, July has 31 days while June has only 30 — making July one day longer.
Also see: What is the Shortest Month of the Year?