Mchenry, Illinois, 4,049 students in 8 schools

McHenry Community Consolidated School District 15 Snow Day Predictor

Q: How much snow does Mchenry get?

About 24.3 inches a winter at a NOAA weather station 2.3 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 2.6 weekday mornings a year with 2 inches of new snow or more, and 1 with 4 inches or more.

Q: What was the biggest snow day near McHenry 15?

8.4 inches on November 30, 2025, the largest single day at a NOAA weather station 2.3 miles away in 10 winters. The snowiest winter was 2018 to 2019, with 41.3 inches.

Q: Does McHenry 15 get more snow days than other Illinois districts?

McHenry 15 averages 1 weekday mornings a winter with 4 inches of new snow or more, more than 87 percent of the 788 Illinois districts with a station record.

Q: How does the McHenry 15 snow day predictor work?

It reads the National Weather Service forecast for Mchenry 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 McHenry 15’s own big snow morning: 3.7 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 McHenry 15, measured against McHenry 15's own big snow morning of 3.7 inches.

The next three school mornings

Will McHenry 15 close tomorrow?

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

Ten winters of school mornings

McHenry 15’s snow record

24.3inches of snow a winter

2.6school mornings a winter with 2 in of new snow or more

1with 4 in or more

3.7 ina big snow morning in McHenry 15: the top tenth of snowy school mornings

8.8school mornings a winter at 0 F or colder

More 4 inch school mornings than 87% of the 788 Illinois districts with a station record.

2.8Nov

4.2Dec

7.8Jan

5.2Feb

2.7Mar

Average snowfall by month, inches

Biggest day 8.4 in on November 30, 2025
Snowiest winter 2018 to 2019, 41.3 in
6 in mornings 0.2 a winter
1 in mornings 5.1 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 McHenry 15

District	Snow a winter	4 in mornings
Crystal Lake Community Consolidated School District 47Crystal Lake	29.1 in	0.4
Wauconda Community Unit School District 118Wauconda	35.5 in	1
Woodstock Community Unit School District 200Woodstock	38.2 in	1.3
Round Lake Community Unit School District 116Round Lake	33.4 in	0.9
Community High School District 155Crystal Lake	26.7 in	0.6
Grayslake Consolidated Community School District 46Grayslake	33.4 in	0.9

The schools

8 schools

Every school in McHenry 15 follows the district’s call: one closing covers them all.

Middle

McHenry Middle School, McHenry
Parkland School, McHenry

Elementary

Riverwood Elementary School, McHenry
Valley View Elem School
Edgebrook Elem School
Hilltop Elem School, McHenry
Chauncey H Duker School, McHenry
Landmark Elem School, McHenry

Questions

McHenry 15 snow day questions

How much snow does Mchenry get?

What was the biggest snow day near McHenry 15?

Does McHenry 15 get more snow days than other Illinois districts?

How does the McHenry 15 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.