Naperville Community Unit District 203 Snow Day Predictor
The odds of a closing or a delay on the next three school mornings in Naperville, measured against Naperville's own big snow morning of 3 inches.
Will Naperville close tomorrow?
How Naperville calls a snow day
When the call comes
As early as possible, typically no later than 6:00 a.m.
“Decisions will be communicated as early as possible, typically no later than 6:00 AM.”Source
How families hear
By phone call, email, text message, the district website and social media.
“Notifications will be sent via phone, email, and text message. Updates will also be posted on our website, social media, and the Emergency Closing Center ( www.emergencyclosingcenter.com ).”Inclement Weather and School Procedures
5 built in snow days
On the 2026 to 2027 calendar, listed as “emergency days”.
“May 27-June 3 Emergency Days (if needed)”Source
eLearning days
Naperville has eLearning days in its winter plan.
“When in-person learning is not possible, we may transition to an eLearning Day to ensure continuity of education. eLearning Days do not require make-up days at the end of the school year.”Source
Making up a lost day
Emergency days after the May 26 tentative last day, May 27 to June 3 if needed.
Make up dates: May 27, May 28, Jun 1, Jun 2, Jun 3.
“May 27-June 3 Emergency Days (if needed)”Source
The 2026 to 2027 calendar
- First day August 13, 2026
- Winter break Dec 21 to Jan 1
- Last day May 26, 2027
Read from Naperville’s own pages on October 8, 2026; the district site is naperville203.org.
Naperville’s snow record
More 4 inch school mornings than 74% of the 788 Illinois districts with a station record.
- Biggest day 8 in on January 31, 2021
- Snowiest winter 2019 to 2020, 37.1 in
- 6 in mornings 0 a winter
- 1 in mornings 4.4 a winter
Measured at a NOAA weather station 2.5 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.
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
Districts near Naperville
| District | Snow a winter | 4 in mornings | Built in days |
|---|---|---|---|
| Indian Prairie Community Unit School District 204Aurora | 22.6 in | 0.1 | 5 |
| Downers Grove Grade School District 58Downers Grove | 22.9 in | 0.5 | |
| Community High School District 99Downers Grove | 28.9 in | 0.6 | |
| Community Unit School District 200Wheaton | 32.3 in | 0.9 | |
| West Chicago School District 33West Chicago | 32.3 in | 0.9 | |
| Valley View Community Unit School District 365URomeoville | 29.2 in | 0.8 | 5 |
22 schools
Every school in Naperville follows the district’s call: one closing covers them all.
High
- Naperville Central High School
- Naperville North High School
Middle
- Kennedy Junior High School, Lisle
- Jefferson Jr High School
- Lincoln Jr High School
- Washington Jr High School
- Madison Jr High School
Elementary
- Elmwood Elem School
- Beebe Elem School
- Steeple Run Elem School
- Mill Street Elem School
- Ranch View Elementary School
- Maplebrook Elem School
- Highlands Elem School
- Prairie Elem School
- Meadow Glens Elementary School
- River Woods Elementary School
- Scott Elementary School
- Kingsley Elementary School
- Naper Elem School
- Ellsworth Elem School
Other schools
- Ann Reid Early Childhood Center
Naperville snow day questions
More for Illinois snow days
The odds are a forecast read, and the superintendent makes the call: the district’s own announcement is the one to follow.