The month with the longest alphabet is September.
This is a bit of a wordplay question, as it plays on the fact that the word "September" has the most letters in its spelling compared to the other months.
Let's look at the number of letters in each month's name:
- January: 7 letters
- February: 8 letters
- March: 5 letters
- April: 5 letters
- May: 3 letters
- June: 4 letters
- July: 4 letters
- August: 6 letters
- September: 9 letters
- October: 7 letters
- November: 9 letters
- December: 8 letters
As you can see, September has the most letters, making it the month with the "longest alphabet".