Snow Day Probability
☀️ Chance of school cancellation tomorrow
Data provided by Open-Meteo
The St. Louis Public Schools and surrounding Missouri districts together serve thousands of students across many public, charter, and private campuses. The St. Louis area averages approximately 20 inches of snowfall per year, with the heaviest snowfall typically occurring between December and February.
School districts in St. Louis generally announce closures through their official websites, automated phone calls, local TV, and radio stations, with most decisions made by the superintendent in the early morning hours, typically by 5:00 AM on storm days. Two-hour delays and remote-learning days are sometimes used in St. Louis as alternatives to a full closure when conditions are borderline.
St. Louis's geography plays a meaningful role in its winter weather: a humid continental to subtropical climate where ice storms frequently trigger closures. These factors directly influence how often St. Louis schools end up closed during a given winter. Geographically, St. Louis sits near 38.63°N, 90.19°W, which shapes how regional storm systems and Arctic air masses interact with the area.
Notable historic snow events in or near St. Louis include major Midwest ice storms that have repeatedly closed schools for days, which produced widespread closures across the region. Historically, schools in the St. Louis area close an average of approximately 6 days per winter season due to snow, ice, or extreme cold. Use our Snow Day Calculator above to check tomorrow's real-time school closure probability for St. Louis based on live weather forecast data from Open-Meteo.
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Our calculator pulls live weather forecast data for St. Louis from the Open-Meteo API and analyzes snowfall accumulation, temperature, wind chill, and 24-hour precipitation totals to generate a school closure probability percentage.
Check between 9 PM and midnight the evening before a potential storm. Weather models are most reliable within a 12–18 hour forecast window, giving you the most accurate prediction for the following morning.
Yes. Public schools close more readily than private schools, which close more readily than colleges and universities. Select your school type for the most accurate St. Louis prediction.