The Prince George’s County Public School System has asked for a state waiver of four instructional days lost to inclement weather this winter.

Maryland requires students to attend school 180 days during a school calendar year. So far, Prince George’s has canceled classes eight times for snowy weather.

“This has been a very trying winter,” Prince George’s County Schools Chief Executive Kevin M. Maxwell wrote.

He said he made the request “in view of the extraordinary and severe weather conditions that resulted in my having to cancel classes on eight separate school days for the safety of our students.”

Maxwell said the Board of Education had the foresight to plan for four “inclement weather make-up days” to add to the end of the school year but “that has not proved sufficient in number this year.”

Earlier this week, the Maryland board voted to allow the state’s 24 school systems to apply for state waivers for one to five days and gave State Superintendent of Schools Lillian M. Lowery authority to decide waiver requests case by case. Montgomery County schools, which have been shut down 10 times this year, asked this week that five instructional days be forgiven.

Maxwell said at Thursday night’s board meeting that if the state grants the waiver, school will end on June 11. He said when district officials are notified, information will be posted on the school system’s Web site noting any change to the calendar.