Check your snow day odds
How the score is calculated
- Snowfall (max 48 pts, regionally adjusted): forecast snow in the next 24 hours × 12. Then a regional adjustment: southern states × 1.25 (less snow-ready), northern states × 0.85 (built for snow).
- Storm timing (max 10 pts): +10 if snow falls during the morning commute (5–8 AM), else +8 if it falls overnight (10 PM–6 AM). Timing decides whether plows beat the buses.
- Ice risk (max 15 pts): estimated from hours with precipitation near freezing but no snow — ice can't be plowed, so it scores high.
- Extreme cold (max 20 pts): 20 pts at 0°F or below, 12 at 15°F or below, 5 at freezing or below.
- Wind (max 12 pts): 12 pts at 35+ mph, 7 at 25+, 3 at 15+.
- District type: rural +8, suburban 0, urban −8 — country roads get plowed last.
- Reality check: if precipitation probability stays under 30%, the total is capped at 25%.
- Capped at 99% — weather and school boards are never 100% certain.
| Factor | Math | Points |
|---|---|---|
| Snowfall | 4 × 12 (Midwest, no regional change) | 48 |
| Timing | snow during 5–8 AM commute | 10 |
| Ice risk | none | 0 |
| Cold | 18°F ≤ 32°F | 5 |
| Wind | 20 mph ≥ 15 | 3 |
| District | suburban | 0 |
| Total | 66% — strong snow day vibes |
How US school districts actually decide
Superintendents aren't asking "how much snow fell?" — they're asking "can buses run every route safely by 7 AM?" Here's what goes into that call:
- Timing beats totals. 6 inches that falls midnight–6 AM is far more disruptive than 6 inches that falls 8 AM–2 PM, because plows run out of time before buses roll.
- Ice is the wildcard. A quarter-inch of ice is more dangerous than 4 inches of snow — it can't be plowed, bridges freeze first, and salt stops working below about 15°F.
- Rural cancels first. Country roads are plowed hours after city streets, bus routes are longer, and stops have no shelter — rural districts consistently close at lower thresholds.
- Cold alone can do it. Wind chills of −25°F to −30°F close schools with zero snow, to protect kids waiting at bus stops.
- The 5 AM drive. Transportation supervisors literally drive the routes around 4–5 AM. The announcement usually lands by 6 AM — which is why checking at 5–6 AM beats checking at midnight.
Best time to check
- Evening (8–10 PM): early read, good for planning.
- Morning (5–6 AM): most accurate — the forecast has firmed up and districts are deciding.
- Check twice: a 30% chance at 9 PM can become 70% by 5 AM if the storm shifts.
Snow day questions
How does the snow day calculator work?
Enter your US ZIP code and district type. It fetches the live forecast — snowfall, ice risk, temperature, wind — scores storm timing (overnight vs morning commute), and adjusts for how snow-tolerant your region is. Result: a 0–99% snow day probability with a full breakdown.
Is the snow day calculator accurate?
It's an estimate, not an official prediction. Districts also weigh road crews, bus availability, staffing and local policy. Always check your district's official announcements.
How much snow does it take for a snow day?
There is no single number — it depends on where you live. Southern districts can call a snow day with 1–2 inches of snow, northern ones often need 6+ inches. The calculator applies a regional tolerance adjustment automatically.
What are the requirements for a snow day?
Districts weigh snowfall amount and timing (especially the morning commute), ice risk, extreme cold and wind — plus road conditions, bus routes and staffing. This snow day predictor scores all of those factors from the live forecast.
Does freezing rain cancel school?
Often yes — even a thin glaze of ice can close schools because it can't be plowed and turns bus routes treacherous. The calculator estimates ice risk from near-freezing precipitation.
When is the best time to check for a snow day?
Evening (8–10 PM) for an early read, then again at 5–6 AM when districts decide and the forecast is most reliable.
Is the snow day calculator free?
Yes — completely free, no signup. Weather data by Open-Meteo.