Derby Unified School District 260 Snow Day Predictor

Derby announces closings before 6AM, by its own published protocol.

By social media, the district website, local TV and radio, and on the district’s own closings page.

4 for the 2026 to 2027 school year, listed on the calendar as “Possible inclement weather make-up days”.

May 19, 2027, on the district’s 2026 to 2027 calendar.

About 4.3 inches a winter at a NOAA weather station 4.2 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 0.7 weekday mornings a year with 2 inches of new snow or more, and 0.1 with 4 inches or more.

It reads the National Weather Service forecast for Derby through the night and the 5 to 8 am bus run, adds winter alerts and the Winter Storm Severity Index, and measures the snow against Derby’s own big snow morning: 3.4 inches, the top tenth of snowy weekday mornings at a NOAA weather station 4.2 miles away.

Kansas requires 186 school days (181 for seniors), or by board policy 1,116 school hours for grades 1 to 11 (1,086 for seniors, 465 for kindergarten). Once the board's scheduled snow make-up days are used up, extra weather closures count as school days, up to the number of make-up days scheduled or five days, whichever is smaller.