Predict the probability of a school closure based on tomorrows forecast and your districts history.
Supports US ZIP codes and Canadian postal codes
Our snow day calculator uses live weather data and a custom probability model to estimate the chance that schools will close for snow in your area. The snow day calculator looks at real-time forecasts for the 2025 snow season so you can quickly see how likely a snow day is before you set your alarm.
The snow day calculator pulls data from a weather API using your ZIP or postal code, including snowfall, temperature, wind and ice conditions for North American locations.
Inspired by tools like the AccuWeather snow day calculator, our snow day calculator weighs snow totals, freezing temperatures, wind and ice to estimate how school districts typically respond.
The snow day calculator turns all of this into a 0-100% chance of a snow day, grouped into very low, low, medium and high levels so you can quickly see whether a snow day is likely.
The snow day calculator is a prediction tool and cannot guarantee school closures. Always follow guidance from your local school district and official weather alerts.
The snow day calculator is built to give a reasonable estimate, not a guarantee. By combining real-time weather API data with a scoring model inspired by tools like the AccuWeather snow day calculator, it usually captures the overall risk well, but local school officials make the final decision.
The snow day calculator 2025 focuses on current North American winter patterns, using up-to-date snowfall, temperature, wind and ice forecasts. We tune the model so that each snow season the calculator reflects how districts are actually reacting to storms.
This snow day calculator is not the original AccuWeather snow day calculator and does not rely on a single provider. Instead, it uses a weather API to pull live forecasts for North American locations and applies a similar idea of turning that data into an easy-to-read snow day probability.
The snow day calculator works best for U.S. ZIP codes and Canadian postal codes, where our weather data and school-closure assumptions are strongest. Other regions may still get a result, but the prediction may be less accurate.
During fast-changing winter storms, it is a good idea to refresh the snow day calculator a few times as new forecasts arrive, especially the evening before and early in the morning. As conditions update, the probability score can move up or down.
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
No server roundtrip. All math runs in your browser so results appear the moment you finish typing.
We never collect, store, or transmit your inputs. Every calculation runs locally in your browser.
Each calculator includes the formula, plain-English explanation, and FAQs so you understand the result.
Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
FAQ
Everything you need to know about this calculator. Can't find what you're looking for? Email our team.
Modern snow day calculators are 75-90% accurate when given good inputs (your school closure history, the actual forecast, your region snow day policy). They work by combining: (1) snowfall prediction, (2) temperature and timing, (3) ice and wind factors, (4) your school specific threshold. They are more accurate for big storms than borderline 1-2 inch events.
How it works
Our snow day calculator lets you combine tomorrow forecast with your district closure history to get a personalized snow day probability, in three steps.
Type the predicted snow total (inches), low temperature (F), and whether the snow starts before, during, or after school hours. Also note if freezing rain, ice, or high winds are expected. These all affect closure decisions beyond just snowfall.
Tell the calculator your district typical closure threshold: how many inches of snow cause closures? Most northern urban districts close at 4-6 inches. Southern districts close at 1-2 inches. Rural districts often stay open longer. Set the slider based on your district history.
The result shows a 0-100% chance of closure, the reasoning (which factors contributed most), and the confidence level. If the forecast is uncertain (50/50 between 3 inches and 8 inches), the calculator will show a wide probability range. The result is most accurate 6-12 hours before the school start time.