Snow Day Predictor
Estimate tomorrow's snow-day likelihood with a fixed heuristic based on forecast snowfall, overnight low, precipitation chance, school type, and broad US region.
Snowfall Probability Anchors
Base probabilities apply before temperature, precipitation, school, and region adjustments.
| Forecast snowfall | Base probability | Northern adjustment | Southern adjustment |
|---|---|---|---|
| 0 in | 2% | -10 points | +20 points |
| 1 in | 12% | -10 points | +20 points |
| 3 in | 28% | -10 points | +20 points |
| 6 in | 55% | -10 points | +20 points |
| 12 in or more | 90% | -10 points | +20 points |
Frequently Asked Questions about the Snow Day Predictor
How is this different from the snow day calculator?
The snow day calculator estimates a longer-running, historical-and-seasonal probability for your area. The snow day predictor is a single-day, forecast-driven estimate for tomorrow specifically. It takes the overnight snowfall forecast, the overnight low, and the precipitation chance from your local weather, then blends in school type and region. Use the calculator when you want a season-level baseline. Use the predictor the night before, with a fresh forecast in hand.
Why does college lower the result?
The heuristic subtracts 25 percentage points when college is selected. That is a fixed model assumption, not a measured probability for a specific campus. Colleges can close, delay, or move classes online based on local roads, transit, staffing, and policy.
Why does picking a southern region raise the probability so much?
The heuristic adds 20 percentage points for its southern setting and subtracts 10 for its northern setting. Those are broad assumptions about regional preparedness, not local measurements. Choose the setting that best reflects local winter operations, then rely on the district's official decision.
What should I do if the result lands in the 41 to 60 percent moderate band?
Treat the band as uncertain and check the district website, alert system, or other official channel. Announcement timing varies by district and conditions, so keep the normal plan unless the district confirms a change.
Is this an official forecast?
No. The predictor is a fixed heuristic, not a model your district uses. Real cancellation decisions depend on road conditions, transportation and staffing constraints, local policy, and updated forecasts. The predictor does not know your district's rules or live conditions. Use the official district announcement.
Related Calculators
More calculators in "Date & Time"
Age at a Specific Date CalculatorBillable Hours CalculatorCorrected Age Calculator (Preemie)Daylight Saving Time CalculatorIVF Due Date CalculatorShift Differential Pay Calculator
See all 53 calculators in "Date & Time"