Regional School Unit 21 snow day calculator
Will Regional School Unit 21 close tomorrow?
District facts
- Official name
- Regional School Unit 21
- Schools
- 6
- Grades
- pre-K to grade 12
- Office
- Kennebunk, ME
- Official site
- www.rsu21.net
- Snow a year
- 49 in. · 6.8 days with 3+ in.
- NCES ID
- 2314773
National Center for Education Statistics (CCD 2024–25, EDGE GRF25); NOAA 1991–2020 normals. Not affiliated with the district.
Past winter days
We record what happened on each storm day (our chance, and whether Regional School Unit 21 closed, delayed or opened) from parent reports. The first days appear here this winter. Report today's decision.
What it takes to close Regional School Unit 21
- Snow line
- About 9.5 in. of overnight snow
- Ice line
- About .20 in. of ice
- Cold line
- −29°F wind chill at bus time (normal winter low 16°F)
- County
- York County
Levels where a closure becomes likely in our model for ZIP 04043, from Regional School Unit 21's local snow normal: 6.8 days a year with 3 or more inches. These are model estimates, not the district's policy.
Nearby districts
| District | Snow a year | Snow line |
|---|---|---|
| Biddeford Public Schools | 49 in. | 9.5 in. |
| Sanford Public Schools | 70 in. | 10 in. |
| School Administrative District 60 | 70 in. | 10 in. |
| Saco Public Schools | 69 in. | 10 in. |
| School Administrative District 57 | 81 in. | 10.5 in. |
| School Administrative District 06 | 81 in. | 10.5 in. |
ZIP codes Regional School Unit 21 serves
04043, 04046
ZIP codes that overlap the district's boundary (NCES EDGE GRF25). Some are shared with neighboring districts.
Check a different ZIP
Loading tonight's forecast…
Snow by hour
From the National Weather Service forecast, updated hourly. Estimate only. Your district makes the call.
Regional School Unit 21 snow day questions
Is Regional School Unit 21 closed tomorrow?
The card above shows tomorrow's chance that Regional School Unit 21 closes or delays school, from tonight's National Weather Service forecast for the district's area. It is an estimate; only the district can announce a closure, usually on its website, by text or phone alert, and through local TV and radio.
How much snow does it take to close Regional School Unit 21?
There is no fixed number: the district weighs snow totals, ice, wind chill, road crews and timing. Our model treats about 9 inches of overnight snow as the level where closures become likely around ZIP 04043, which averages 49 inches of snow a year (NOAA 1991–2020 normals).
When does Regional School Unit 21 announce snow days?
Districts usually decide early in the morning, after crews check the roads, and sometimes the evening before when a big storm is certain. Check the district's official website and alerts for the decision; we don't report official closings.
Guides
- How much snow cancels school?
From one inch in Atlanta to a foot in Buffalo: what it takes in every state, with NOAA data.
- What time are snow days announced?
When districts decide, how they tell families, and when to check the calculator.
- How school districts decide snow days
Who makes the call, what they check before dawn, and why neighboring districts disagree.
- Snow day vs. delay vs. early dismissal
What each one means, when districts use them, and how the calculator scores each.