Concord, Massachusetts, 1,230 students in 1 school

Concord-Carlisle School District Snow Day Predictor

Q: How much snow does Concord get?

About 37.9 inches a winter at a NOAA weather station 4.8 miles away, averaged over 8 winters. Between December 1 and March 31 that brings 3.9 weekday mornings a year with 2 inches of new snow or more, and 1.9 with 4 inches or more.

Q: What was the biggest snow day near Concord-Carlisle?

14.5 inches on January 26, 2026, the largest single day at a NOAA weather station 4.8 miles away in 8 winters. The snowiest winter was 2020 to 2021, with 54.8 inches.

Q: How does the Concord-Carlisle snow day predictor work?

It reads the National Weather Service forecast for Concord 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 Concord-Carlisle’s own big snow morning: 5 inches, the top tenth of snowy weekday mornings at a NOAA weather station 4.8 miles away.

Q: How far ahead does the Concord-Carlisle snow day predictor look?

Three school mornings, as far as the National Weather Service hourly forecast reaches. Weekends and breaks are skipped, so a Friday storm is read for Monday’s buses.

The odds of a closing or a delay on the next three school mornings in Concord-Carlisle, measured against Concord-Carlisle's own big snow morning of 5 inches.

The next three school mornings

Will Concord-Carlisle close tomorrow?

Reading the National Weather Service forecast for the overnight and the bus hours in Concord.

Ten winters of school mornings

Concord-Carlisle’s snow record

37.9inches of snow a winter

3.9school mornings a winter with 2 in of new snow or more

1.9with 4 in or more

5 ina big snow morning in Concord-Carlisle: the top tenth of snowy school mornings

1.3Nov

5.7Dec

12.3Jan

13Feb

4.2Mar

Average snowfall by month, inches

Biggest day 14.5 in on January 26, 2026
Snowiest winter 2020 to 2021, 54.8 in
6 in mornings 0.6 a winter
1 in mornings 6.8 a winter

Measured at a NOAA weather station 4.8 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.

The Massachusetts rule

How Massachusetts counts a lost day

Massachusetts requires a 185 day calendar, at least 180 days actually held, and 900 hours for elementary or 990 hours for secondary students. Every day lost through March 31 is made up with full rescheduled days; after March 31, days are made up until 180 or the scheduled 185th day, whichever comes first.

The Massachusetts rules in the agency’s own words, and every Massachusetts district

Next door

Districts near Concord-Carlisle

District	Snow a winter	4 in mornings
Concord School DistrictConcord	37.9 in	1.9
Bedford School DistrictBedford	37.9 in	1.9
Lincoln School DistrictLincoln	37.9 in	1.9
Lincoln-Sudbury School DistrictSudbury	45 in	2.1
Acton-Boxborough Regional School DistrictActon	48.7 in	2.4
Lexington School DistrictLexington	37.9 in	1.9

The schools

1 school

Every school in Concord-Carlisle follows the district’s call: one closing covers them all.

High

Concord Carlisle High

Questions

Concord-Carlisle snow day questions

How much snow does Concord get?

What was the biggest snow day near Concord-Carlisle?

How does the Concord-Carlisle snow day predictor work?

How does Massachusetts handle snow days?

How far ahead does the Concord-Carlisle snow day predictor look?

More winter

More for Massachusetts snow days

Snow day predictorClosing and delay odds for any ZIP, with the snowiest districts in the country.Snow depth mapHow much snow is on the ground right now, measured, across the country.First snow datesWhen the first measurable snow usually lands where you live.Frozen pipesThe nights cold enough to freeze a pipe, and what to do before one.Snow plow trackerWhere the plows are during a storm, city by city.Massachusetts winter forecastThe season ahead for Massachusetts: snowfall, cold and the first snow.

A residential street under deep snow on a bright blue morning, cars parked along the curb buried into smooth white mounds, one set of tire tracks down the middle — 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.