Maryland Gov. Larry Hogan has signed an executive order mandating that the state's public schools begin classes after Labor Day.

WJZ-TV reports that the rule will take effect in the 2017-2018 school year. The governor's order also states that school districts must end classes no later than June 15.

Hogan says delaying the start of classes would have economic, environmental, health and public safety benefits. “August is the second hottest month of the year here in Maryland," says Hogan. "Later school starts will allow us to help ensure that students...are kept out of hot, un-air conditioned classrooms."

Hogan cites studies that he says have shown there are no adverse effects to delaying the start of school. The number of instructional days for students will not change.

The order includes a provision allowing districts to seek a waiver from the State Board of Education if they can provide “compelling justification as to why they should be exempted” from a post-Labor Day start date.

Opponents of the school schedule mandate argue that it takes local control away from schools systems and could interfere with winter and summer breaks and testing schedules. Teachers unions argue that Hogan’s action will cost families more for child care.

Video from WJZ-TV: