How accurate is snow day calculator?

A snow day calculator estimates the probability of a school or workplace closure by using weather forecasts, historical closure data, predicted snowfall, temperature levels, and sometimes local regulations.

Accuracy:
• More reliable than guessing because it relies on real-time weather data and past closure patterns.
• Not fully accurate, since weather conditions can change quickly and closure decisions are often influenced by local factors such as road safety, transportation availability, staffing levels, and administrative policies.
• Most effective when used 1–3 days in advance, as short-term forecasts tend to be more precise; accuracy usually declines for long-range predictions.

In addition, snow day calculators work best as a supporting tool rather than a final authority. They provide a general idea of what might happen, helping families and employees plan ahead. However, unexpected factors like overnight freezing, sudden storms, or emergency decisions can still lead to different outcomes. Overall, a snow day calculator is a helpful guide, but real-time conditions and human judgment ultimately determine closures.