Lansing, Illinois, 3,276 students in 4 schools

Thornton Fractional Township High School District 215 Snow Day Predictor

Q: How much snow does Lansing get?

About 25.8 inches a winter at a NOAA weather station 1.3 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 2.9 weekday mornings a year with 2 inches of new snow or more, and 0.9 with 4 inches or more.

Q: What was the biggest snow day near Thornton Fractional?

14.8 inches on February 16, 2021, the largest single day at a NOAA weather station 1.3 miles away in 10 winters. The snowiest winter was 2020 to 2021, with 43.3 inches.

Q: Does Thornton Fractional get more snow days than other Illinois districts?

Thornton Fractional averages 0.9 weekday mornings a winter with 4 inches of new snow or more, more than 79 percent of the 788 Illinois districts with a station record.

Q: How does the Thornton Fractional snow day predictor work?

It reads the National Weather Service forecast for Lansing 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 Thornton Fractional’s own big snow morning: 4.5 inches, the top tenth of snowy weekday mornings at a NOAA weather station 1.3 miles away.

The odds of a closing or a delay on the next three school mornings in Thornton Fractional, measured against Thornton Fractional's own big snow morning of 4.5 inches.

The next three school mornings

Will Thornton Fractional close tomorrow?

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

Ten winters of school mornings

Thornton Fractional’s snow record

25.8inches of snow a winter

2.9school mornings a winter with 2 in of new snow or more

0.9with 4 in or more

4.5 ina big snow morning in Thornton Fractional: the top tenth of snowy school mornings

More 4 inch school mornings than 79% of the 788 Illinois districts with a station record.

2.2Nov

3.6Dec

7.8Jan

9.4Feb

2Mar

Average snowfall by month, inches

Biggest day 14.8 in on February 16, 2021
Snowiest winter 2020 to 2021, 43.3 in
6 in mornings 0.2 a winter
1 in mornings 4.8 a winter

Measured at a NOAA weather station 1.3 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 Illinois rule

How Illinois counts a lost day

Illinois requires a calendar of at least 185 days to guarantee 176 days of actual student attendance, each of at least 5 clock hours. The extra calendar days are emergency days used first; after they are gone, the State Superintendent may excuse days lost to an act of God or a hazard beyond the district's control without cutting state aid.

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

Next door

Districts near Thornton Fractional

District	Snow a winter	4 in mornings
Thornton Township High School District 205South Holland	25.8 in	0.9
Bloom Township High School District 206Chicago Heights	22.2 in	0.8
Bremen Community High School District 228Midlothian	25.6 in	0.5
Crete-Monee Community Unit School District 201-UCrete	26.3 in	0.7
Community High School District 218Oak Lawn	27.2 in	0.8
Kirby School District 140Tinley Park	25.6 in	0.5

The schools

4 schools

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

High

Thornton Fractnl So High School
Thornton Fractnl No High School, Calumet City
Center for Academics and Technolo, Calumet City
Center for Alternative Learning, Calumet City

Questions

Thornton Fractional snow day questions

How much snow does Lansing get?

What was the biggest snow day near Thornton Fractional?

Does Thornton Fractional get more snow days than other Illinois districts?

How does the Thornton Fractional snow day predictor work?

How does Illinois handle snow days?

More winter

More for Illinois 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.Illinois winter forecastThe season ahead for Illinois: 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.