Thirty days hath September is a traditional English mnemonic rhyme, of which many variants are commonly used in English-speaking countries to remember the lengths of the months in the Julian and Gregorian calendars.
Here is one version of the rhyme attributed to Mother Goose:
Thirty days hath September,
April, June, and November
All the rest have 31,
Except for February.
Another version that rhymes perfectly is from an unknown source and date:
Thirty days hath September,
April, June, and November;
Thirty-one the others date,
Except in February, twenty-eight;
But in leap year we assign
February, twenty-nine.
The mnemonic rhyme begins "Thirty days hath September / April, June, and November." The rhyme goes on to say that the rest have 31, except that February has 28, or 29 in leap years. There are many variations, some with modern rhyme and meter and some without.
5.6 months.
5 months have 30 days or less. Four months have 30 days and one month, February, has 28 (or 29 in leap year). There is an old mnemonic rhyme to help you remember: "30 days hath September, April, June and November" -- all the rest have 31 [days] except February, which has 28 and in leap year 29.
To find out how many days are in 16 months, we'll use the average number of days in a month, which is approximately 30.44 days per month. 16 months × 30.44 days/month ≈ 487.04 days 16 months×30.44 days/month≈487.04 days So, 16 months is approximately equal to 487 days.
There are 304 days in 10 months.
The mnemonic rhyme begins "Thirty days hath September / April, June, and November." The rhyme goes on to say that the rest have 31, except that February has 28, or 29 in leap years. There are many variations, some with modern rhyme and meter and some without.
5.6 months.
5 months have 30 days or less. Four months have 30 days and one month, February, has 28 (or 29 in leap year). There is an old mnemonic rhyme to help you remember: "30 days hath September, April, June and November" -- all the rest have 31 [days] except February, which has 28 and in leap year 29.
3 months?
There are 280 days in 9 months.
To find out how many days are in 16 months, we'll use the average number of days in a month, which is approximately 30.44 days per month. 16 months × 30.44 days/month ≈ 487.04 days 16 months×30.44 days/month≈487.04 days So, 16 months is approximately equal to 487 days.
There are 304 days in 10 months.
109 days = 3.89 months
82 days = 2.7 months.
5 months = about 152.2 days.
140 days = 4.6 months.
13 months = 395.7 days.