The District’s school system has extended the academic year by one day to make up for classes missed due to inclement weather, officials said Tuesday.

The school year was initially scheduled to end with a half-day of instruction on June 20. Now that will be a full day of instruction and classes will continue for a half-day on June 21.

In addition, June 3 — previously scheduled as a parent-teacher conference day — will now be a regular school day. Schools will make arrangements for the parent conferences to occur at other times.

The changes were made to meet the school system’s legal obligation to hold 180 days of class each year.

Officials built one extra snow day into the academic calendar, but schools have been closed three times for weather— twice in October for Hurricane Sandy and once in March, when forecasters predicted a severe snowstorm (the “snowquester”) that never materialized.