The odds of a closing or a delay on the next three school mornings in Derby, measured against Derby's own big snow morning of 8.4 inches.
The next three school mornings
Will Derby close tomorrow?
Reading the National Weather Service forecast for the overnight and the bus hours in Derby.
Ten winters of school mornings
Derby’s snow record
34inches of snow a winter
3.4school mornings a winter with 2 in of new snow or more
1.6with 4 in or more
8.4 ina big snow morning in Derby: the top tenth of snowy school mornings
0.8Nov
5.7Dec
9Jan
11.5Feb
6.4Mar
Average snowfall by month, inches
Biggest day 13.5 in on January 26, 2026
Snowiest winter 2017 to 2018, 65 in
6 in mornings 1.2 a winter
1 in mornings 5.2 a winter
Measured at a NOAA weather station 4 miles away. Mornings are the 7 am snow reading on a weekday from December 1 through March 31, over the ten winters from 2016 to 2017 through 2025 to 2026, from NOAA GHCN Daily.
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The Connecticut rule
How Connecticut counts a lost day
Connecticut requires at least 180 days and 900 hours of actual school work, counting no more than 7 hours a day.
Every school in Derby follows the district’s call: one closing covers them all.
High
Derby High School
Middle
Derby Middle School
Elementary
Irving School
Bradley School
Other schools
Little Raiders University
Questions
Derby snow day questions
About 34 inches a winter at a NOAA weather station 4 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 3.4 weekday mornings a year with 2 inches of new snow or more, and 1.6 with 4 inches or more.
13.5 inches on January 26, 2026, the largest single day at a NOAA weather station 4 miles away in 10 winters. The snowiest winter was 2017 to 2018, with 65 inches.
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: 8.4 inches, the top tenth of snowy weekday mornings at a NOAA weather station 4 miles away.
Connecticut requires at least 180 days and 900 hours of actual school work, counting no more than 7 hours a day.
A remote learning day counts as an actual school session if it meets the Commissioner's remote learning standards; the statute sets no cap.
The morning after a big one: cars buried to the mirrors and one set of tracks down the middle. A street like this is a closing, no debate. Photo, Fairfax, Virginia, January 2016: Jarek Tuszyński, CC BY 4.0
The odds are a forecast read, and the superintendent makes the call: the district’s own announcement is the one to follow.
