Which Months Have Thirty Days?

Thirty days have November, April, June, and September.

Which months have thirty are days in a month?

Rhyme to remember number of days in each month:

30 days has September, April, June, and November.

Who decided which months have 30 days?

Julius Caesar modified the Roman calendar in 46 B.C. to make each month have either 30 or 31 days, with the exception of Februarius, which had 29 days and gained an extra day every fourth year.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.