How many months of the calendar have only 30 days?
There are 4 months of the year that have exactly 30 days. They are April, June, September and November. "Thirty days hath September " and its many variants is a traditional English mnemonic rhyme to remember the lengths of the months.
One version of the rhyme is as follows:
Thirty days has September,
April, June, and November.
All the rest have thirty-one,
Except for February alone,
Which hath but twenty-eight days clear,
And twenty-nine in each leap year.
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