❄️ Snow Day Calculator

A Snow Day Calculator is a free online tool that predicts the probability of school closures due to winter weather. It analyzes real-time weather forecast data including snowfall accumulation, temperature, wind speed, and ice conditions for your specific location, then calculates a percentage chance that schools will close. Our calculator uses data from Open-Meteo weather service, considering factors like regional infrastructure readiness and school type to provide accurate predictions.

Snow day predictions within 24-48 hours typically achieve 75-85% accuracy by combining multiple weather factors. The calculator considers snowfall amount, temperature, wind speed, and regional patterns. However, final closure decisions are always made by your local school district based on real-time road conditions and safety assessments, so treat the probability as an informed estimate.

Key factors include: snowfall accumulation (heaviest weight in the algorithm), temperature and wind chill, wind speed, ice and freezing rain conditions, school type (rural schools close more easily than urban ones), regional infrastructure (southern US states close more easily than northern states with better snow removal equipment), and the timing of the storm relative to morning school hours.

Yes! While primarily designed for US ZIP codes, our calculator also supports city name searches worldwide. The weather data comes from Open-Meteo which provides global coverage. However, the school closure algorithm is optimized for US and Canadian school districts. For international locations, the prediction provides a general indication of severe winter weather likelihood.

The most reliable window is the evening before a potential snow day (6-10 PM), when weather models have the most accurate short-range forecast data. You can also check in the early morning (5-7 AM) for the latest updates. Predictions become more accurate as the event approaches — checking 24-48 hours ahead gives you a good early estimate, while same-day checks offer the highest accuracy.

Yes, 100% free with no ads, no registration, no watermark, and no usage limits. All weather data is fetched directly in your browser using the free Open-Meteo API. Your location data is never stored on any server — everything runs locally in your browser for complete privacy.