How this calculator works
Enter your forecast snowfall, whether it’s expected overnight or during the day, how snow-ready your region typically is, and your school type. This calculator combines those into our own transparent point-based formula, published in full below, unlike black-box competitor tools.
The formula (our own model, not a hidden weather API)
basePoints = min(forecastSnowfallIn × 15, 90) timingBonus = overnight ? 10 : 0 readinessMultiplier: Deep South 1.5 · South 1.25 · Transitional 1.0 · Northern 0.75 · Snow Belt 0.5 schoolTypeAdjustment: Public 0 · Private −5 · College −20 probability = clamp((basePoints + timingBonus) × readinessMultiplier + schoolTypeAdjustment, 1, 99)
This is our own model: a transparent, deterministic point system, not a statistical or meteorological prediction. We never report exactly 0% or 100%, since even a “sure thing” snow day can get called off (or a “no chance” day can surprise everyone).
Worked example
3 inches forecast, overnight, a Transitional region, Public school:
- Base points: 3 × 15 = 45
- Plus overnight bonus: 45 + 10 = 55
- Times the Transitional multiplier (1.0): 55
- Plus school adjustment (0): 55%
Frequently asked questions (FAQ)
Is this a real weather forecast?
No. You enter the forecast snowfall yourself (from your local weather source), and this calculator turns that, plus a few other factors, into a fun probability estimate. It doesn't pull live weather data or predict the weather itself.
How is the probability calculated?
We publish our exact formula below: snowfall amount, whether it falls overnight or during the day, how snow-ready your region typically is, and your school type all feed into a transparent point system. Nothing is hidden.
Why does the same snowfall amount give different odds in different regions?
A region that rarely sees snow (like the Deep South) usually lacks plows, salt trucks, and driver experience with snow, so even a modest snowfall is more likely to shut things down. A well-equipped Snow Belt region can often handle the same snowfall without missing a beat.
Why do colleges get a lower snow day probability than public schools?
Colleges typically serve a more geographically concentrated, often on-campus population and have more resources for keeping campus operational, so they close for weather far less often than K-12 public school districts, which rely on buses traveling longer rural routes.
Can I share my result?
Yes, feel free to screenshot your result and share it. This is meant to be a fun, shareable estimate for snow-day season, not a serious prediction tool.
Sources
This is our own transparent model, not a statistical or weather-service claim. See the formula above for the complete, published logic.