Central Islip, New York, 7,867 students in 8 schools

Central Islip Union Free School District Snow Day Predictor

Q: How long is a delayed start in Central Islip?

2 hours: on a delay morning every school starts that much later.

Q: When is the last day of school for Central Islip?

June 25, 2027, on the district’s 2026 to 2027 calendar.

Q: How much snow does Central Islip get?

About 28.5 inches a winter at a NOAA weather station 5.4 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 1.8 weekday mornings a year with 2 inches of new snow or more, and 1.3 with 4 inches or more.

Q: What was the biggest snow day near Central Islip?

23.5 inches on January 29, 2022, the largest single day at a NOAA weather station 5.4 miles away in 10 winters. The snowiest winter was 2017 to 2018, with 65.9 inches.

Q: How does the Central Islip snow day predictor work?

It reads the National Weather Service forecast for Central Islip 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 Central Islip’s own big snow morning: 6.1 inches, the top tenth of snowy weekday mornings at a NOAA weather station 5.4 miles away.

The odds of a closing or a delay on the next three school mornings in Central Islip, measured against Central Islip's own big snow morning of 6.1 inches.

The next three school mornings

Will Central Islip close tomorrow?

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

The Central Islip playbook

How Central Islip calls a snow day

A 2 hour delay

On a delay morning every school starts 2 hours late.

“2-Hour Delayed Opening: Please note that in the event of a 2-hour delayed opening, students should be at bus stops 2 hours from their regular pick-up time. Students will be able to enter the building at 2 hours after their normal start time.”

Delay schedule

The 2026 to 2027 calendar

First day September 1, 2026
Winter break Dec 21 to Jan 1
February break Feb 15 to Feb 19
Last day June 25, 2027

District calendar

Read from Central Islip’s own pages on October 8, 2026; the district site is centralislip.k12.ny.us.

Ten winters of school mornings

Central Islip’s snow record

28.5inches of snow a winter

1.8school mornings a winter with 2 in of new snow or more

1.3with 4 in or more

6.1 ina big snow morning in Central Islip: the top tenth of snowy school mornings

0school mornings a winter at 0 F or colder

0.4Nov

3.6Dec

9.3Jan

10Feb

4.7Mar

Average snowfall by month, inches

Biggest day 23.5 in on January 29, 2022
Snowiest winter 2017 to 2018, 65.9 in
6 in mornings 0.8 a winter
1 in mornings 3.5 a winter

Measured at a NOAA weather station 5.4 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.

The New York rule

How New York counts a lost day

New York requires 180 days of session plus 900 hours a year for kindergarten to grade 6 and 990 hours for grades 7 to 12. The Commissioner can excuse up to 5 days closed for extraordinary weather, but only if the district cannot make them up by using all its scheduled vacation days before the June Regents exams.

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

Next door

Districts near Central Islip

District	Snow a winter	4 in mornings	Built in days
Hauppauge Union Free School DistrictHauppauge	28.5 in	1.3
Brentwood Union Free School DistrictBrentwood	28.5 in	1.3
East Islip Union Free School DistrictIslip Terrace	28.5 in	1.3
Smithtown Central School DistrictSmithtown	28.5 in	1.3	3
Islip Union Free School DistrictIslip	28.5 in	1.3
Bay Shore Union Free School DistrictBay Shore	28.5 in	1.3

The schools

8 schools

Every school in Central Islip follows the district’s call: one closing covers them all.

High

Central Islip Senior High School

Middle

Ralph Reed School

Elementary

Charles A Mulligan Elementary School
Andrew T Morrow School, Islandia
Francis J O'Neill School
Cordello Avenue Elementary School
Marguerite L Mulvey School
Anthony Alfano Elementary School

Questions

Central Islip snow day questions

How long is a delayed start in Central Islip?

When is the last day of school for Central Islip?

How much snow does Central Islip get?

What was the biggest snow day near Central Islip?

How does the Central Islip snow day predictor work?

How does New York handle snow days?

More winter

More for New York 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.New York winter forecastThe season ahead for New York: 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.