About the School Closure Calculator
This tool focuses specifically on full district closure risk - when schools will not open at all. It weighs heavier snowfall, dangerous ice, extreme wind chill, and poor visibility against typical superintendent decision thresholds used across North America.
Why This Tool Matters
School districts across the US and Canada make closure and delay decisions before dawn, weighing bus route safety, sidewalk conditions, and forecast trends. Parents and staff need a clear picture of morning weather risk long before official announcements arrive.
For a fuller winter picture, also check our Snow Day Predictor, School Delay Calculator, and Snowfall Predictor — all powered by the same live forecast data.
How It Works
Assess full school district closure risk from incoming winter weather. Each time you calculate, this tool pulls live data from the Open-Meteo weather API - including temperature, precipitation, wind, visibility, and hourly forecasts - and applies our school-focused scoring model for your exact location.
What We Analyze
- Overnight and morning snowfall accumulation forecasts
- Road surface temperature and ice formation risk
- Wind speed and visibility along bus routes
- Wind chill and extreme cold policy thresholds
- Timing of precipitation relative to bus departure windows
Formula & Methodology
Closure Risk = snow day probability x 0.85
Scores are derived from live forecast data and regional winter weather thresholds. They are estimates for planning purposes - not official advisories.
How to Interpret Your Results
Use your result alongside your district notification system - not as a replacement for official announcements.
- Scores under 40 suggest schools will likely open (possibly with delays).
- Scores 40-70 indicate a close call - superintendents may wait until morning to decide.
- Scores above 70 strongly suggest full closure - plan for the day off.
When to Recalculate
Winter weather changes quickly. Recalculate before bed when a storm is approaching, again between 5-6 AM for school and commute decisions, and any time you receive a weather alert for your area. If conditions feel worse than your last result, trust your eyes and official sources over cached numbers.
Important: SnowDayCalculator.io tools are for informational and educational purposes only. They do not replace official school closure notices, National Weather Service warnings, or government travel advisories. Always follow directives from your school district, employer, and local authorities.