South Holland, Illinois, 4,491 students in 5 schools

Thornton Township High School District 205 Snow Day Predictor

Q: How much snow does South Holland get?

About 25.8 inches a winter at a NOAA weather station 4.5 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 205?

14.8 inches on February 16, 2021, the largest single day at a NOAA weather station 4.5 miles away in 10 winters. The snowiest winter was 2020 to 2021, with 43.3 inches.

Q: Does Thornton 205 get more snow days than other Illinois districts?

Thornton 205 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 205 snow day predictor work?

It reads the National Weather Service forecast for South Holland 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 205’s own big snow morning: 4.5 inches, the top tenth of snowy weekday mornings at a NOAA weather station 4.5 miles away.

The odds of a closing or a delay on the next three school mornings in Thornton 205, measured against Thornton 205's own big snow morning of 4.5 inches.

The next three school mornings

Will Thornton 205 close tomorrow?

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

Ten winters of school mornings

Thornton 205’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 205: 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 4.5 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 205

District	Snow a winter	4 in mornings
Thornton Fractional Township High School District 215Lansing	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

5 schools

Every school in Thornton 205 follows the district’s call: one closing covers them all.

High

Thornwood High School
Thornton Township High School, Harvey
Thornridge High School, Dolton
Outlook Academy
PEACE Center, Dolton

Questions

Thornton 205 snow day questions

How much snow does South Holland get?

What was the biggest snow day near Thornton 205?

Does Thornton 205 get more snow days than other Illinois districts?

How does the Thornton 205 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.