A Snow Day Calculator is an online prediction tool. It tries to guess if schools will close because of snow or bad winter weather. It does not make official decisions. Only schools and school districts can cancel cl****es. The calculator only gives a prediction. This tool works by using weather forecasts. It looks at things like snowfall amount, temperature, wind speed, and storm timing. Then it uses a formula to guess the chance of a snow day. The result is shown as a percentage. For example, it might say there is a 70% chance of a snow day.