Joliet, Illinois, 6,819 students in 4 schools

Joliet Township High School District 204 Snow Day Predictor

Q: How much snow does Joliet get?

About 19.4 inches a winter at a NOAA weather station 2.3 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 2.2 weekday mornings a year with 2 inches of new snow or more, and 0.6 with 4 inches or more.

Q: What was the biggest snow day near Joliet 204?

8 inches on February 10, 2018, the largest single day at a NOAA weather station 2.3 miles away in 10 winters. The snowiest winter was 2017 to 2018, with 31.5 inches.

Q: Does Joliet 204 get more snow days than other Illinois districts?

Joliet 204 averages 0.6 weekday mornings a winter with 4 inches of new snow or more, more than 52 percent of the 788 Illinois districts with a station record.

Q: How does the Joliet 204 snow day predictor work?

It reads the National Weather Service forecast for Joliet 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 Joliet 204’s own big snow morning: 3.3 inches, the top tenth of snowy weekday mornings at a NOAA weather station 2.3 miles away.

The odds of a closing or a delay on the next three school mornings in Joliet 204, measured against Joliet 204's own big snow morning of 3.3 inches.

The next three school mornings

Will Joliet 204 close tomorrow?

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

Ten winters of school mornings

Joliet 204’s snow record

19.4inches of snow a winter

2.2school mornings a winter with 2 in of new snow or more

0.6with 4 in or more

3.3 ina big snow morning in Joliet 204: the top tenth of snowy school mornings

5.7school mornings a winter at 0 F or colder

More 4 inch school mornings than 52% of the 788 Illinois districts with a station record.

1.5Nov

3.4Dec

7.4Jan

6.1Feb

1.1Mar

Average snowfall by month, inches

Biggest day 8 in on February 10, 2018
Snowiest winter 2017 to 2018, 31.5 in
6 in mornings 0.1 a winter
1 in mornings 4.6 a winter

Measured at a NOAA weather station 2.3 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 Joliet 204

District	Snow a winter	4 in mornings	Built in days
Joliet Public School District 86Joliet	19.4 in	0.6
Troy Community Consolidated School District 30CPlainfield	29 in	0.6
Plainfield School District 202Plainfield	29 in	0.6	5
Minooka Community Consolidated School District 201Minooka	25.2 in	1.1
Lockport Township High School District 205Lockport	29.2 in	0.8
New Lenox School District 122New Lenox	31.9 in	1.1

The schools

4 schools

Every school in Joliet 204 follows the district’s call: one closing covers them all.

High

Joliet West High School
Joliet Central High School
Pathways Academy
Will Co Detention Center 9-12

Questions

Joliet 204 snow day questions

How much snow does Joliet get?

What was the biggest snow day near Joliet 204?

Does Joliet 204 get more snow days than other Illinois districts?

How does the Joliet 204 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.