Snowfall intensity
Higher forecast snowfall increases the closure estimate because it affects road conditions, visibility, plowing, and bus routes.
Methodology
How Winter Day Calculator estimates snow day risk.
The goal is simple: turn a messy weather forecast into a useful planning signal for parents, students, and school staff. The score is forecast-based, refreshes about every 1 hour, and is designed to explain the next school-morning setup instead of presenting a mystery percentage.
Core inputs
The three forecast signals behind the score.
Temperature risk
Very cold mornings raise the risk even when snowfall is lighter because districts may react to ice, dangerous wind chill, or transportation safety.
Wind and drifting
Strong gusts can turn moderate snowfall into low-visibility conditions and drifting problems, which is why wind is a separate input.
Human-readable output
Instead of hiding behind a black box, the site explains the signals behind each estimate so families can make faster decisions.
Interpretation
What the percentage actually means.
Low risk
The forecast currently shows limited disruption signals. Light snow or manageable temperatures may still create local issues, but the model does not see a strong closure setup.
Moderate risk
One or more signals are becoming meaningful. This is the range where fresh forecast updates matter most because the probability can move quickly.
High risk
Heavy snow, dangerous cold, strong wind, or a combination of all three is creating a closure-friendly setup. Even then, local district policy still decides the final call.
Limits
What this model does not know.
District policy and leadership decisions
School systems weigh staffing, transportation, local road treatment, and operational policy. Those decisions cannot be modeled perfectly from forecast data alone.
Hyper-local neighborhood differences
A regional forecast can still miss street-level icing, lake-effect band placement, and neighborhood snow totals. That is why each page explains the forecast drivers and not just a percentage.
Official announcements
Winter Day Calculator is not an official district or employer alert system. Always confirm with the organization responsible for the final closure decision.