(KMOV) -- In the rural Jefferson County R-VII school district, students haven't attended a full week of classes since before Christmas. The district has called off school ten days this school year.
St. Louis City Schools canceled classes on Thursday because of wind chill concerns, according to spokesperson Patrick Wallace.
It was the district's sixth snow day and the last one built into the school year calendar. The district made a decision to cancel a scheduled professional development day on Friday and ask students to attend a full day of classes.
"That has nothing to do with making up the six days that we've lost, but it does help us make up at least half a day of instructional time we've lost for our students to be with their teachers," said Wallace.
Students who attend Hazelwood Schools will have to make up snow days at the end of the year. As of Thursday, that means students will begin their summer break on June 2nd.
"I don't remember having this many snow days. That's what I think is so unique about this situation is actually using all of them and then going further so early in the season. Winter is not over yet and that gets kinda scary when you think about it ," said Diana Gulotta, spokesperson for Hazelwood Schools.
While districts can make up time at the end of the school year, many are concerned about how to cover required curriculum before standardized testing begins in the spring.
Belleville District 118's superintendent said the board may decide to ask students to attend school on President's Day. Since spring break is a four day weekend around Easter, he doesn't believe students could make up class time then.
Patrick Wallace, with St. Louis Schools, said officials in the district are considering asking the state to push back the window in which students are required to take standardized tests.
Most districts on Thursday said they planned to have school on Friday.