Snow Day Calculator 2026
Will School Close Tomorrow?
Enter your city or ZIP code for a snow day prediction based on live weather data.
Analyzing weather patterns for your location…
What Is a Snow Day Calculator?
A snow day calculator estimates the probability that schools will be closed due to winter weather. It is not an official announcement, it is a planning tool that uses live weather forecast data to give you an early sense of what tomorrow might bring.
This calculator looks at expected snowfall, precipitation, temperature, freezing rain, and wind for your location, then weighs those conditions against regional norms to produce a probability score from 0 to 100%. The result tells you how strongly current forecasts align with the kind of winter weather conditions that tend to lead to school closures in your area.
You can use it the evening before school to get an early read on conditions, then check again in the morning as the forecast sharpens. Results are estimates — they do not replace official closure announcements from your school or district.
How to Use the Snow Day Calculator
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Enter your location
Enter the name of the city, US ZIP Code, Canadian postal code, or UK postcode in the search box. The autocomplete results will guide you to the proper place.
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Or use your current location
Tap Use My Location so that the calculator can identify your location automatically. Your location is only used for this query and is never stored.
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Press Predict
The calculator pulls live data for your local weather forecasts and applies the scoring system. The process is completed within a few seconds.
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Read the result
The information displayed will include the percentage score, verdict (High/ Moderate/ Low Chance), a description of the weather conditions in simple terms, delay probability of 2 hours, and weather tiles including snowfall, temperature, windchill, and precipitation. The forecast confidence is another parameter that displays the certainty of the forecast data.
Who Uses a Snow Day Calculator?
Check whether school might be cancelled so you can plan your evening and morning accordingly.
Decide whether to arrange childcare, adjust the morning routine, or make alternate plans before an official announcement arrives.
Get an early read on whether conditions may affect tomorrow's schedule before the official decision is made.
Winter conditions that affect schools often affect road travel too. The weather data shown can be useful for anyone planning a morning journey.
When Should You Check the Snow Day Calculator?
The calculator is most useful when winter weather is in the forecast for your area. Good times to check include:
- The evening before school when snow, ice, or freezing rain is expected overnight
- When temperatures are forecast to drop sharply and precipitation is likely
- When a storm track is uncertain and you want to see how current conditions look
- When the forecast is changing and you want a more current estimate
Because weather forecasts are updated throughout the day, checking again in the late afternoon or early evening can give you a clearer picture as the forecast sharpens closer to the event. There is no need to check days in advance — the shorter the forecast window, the more reliable the result tends to be.
How Does the Snow Day Calculator Work?
The calculator fetches live hourly forecast data for your location from the Open-Meteo API and applies a scoring model to estimate the likelihood of school closures. It looks at tomorrow's forecast — specifically the 25-hour window starting at local midnight — and weighs five weather factors:
Expected snow accumulation is the most heavily weighted factor. The model also gives extra weight to snow falling in the early morning hours, when road conditions most directly affect buses and school schedules.
Freezing rain and ice are treated separately from snow, since even small accumulations on road surfaces can create hazardous conditions that affect travel.
The highest forecast precipitation probability over the window contributes to the score. A higher chance of precipitation increases the likelihood of significant accumulation.
The overnight low temperature influences the score. Sub-freezing temperatures make precipitation more likely to fall as snow or ice and slow down any treatment of road surfaces.
Stronger winds can create drifting and blowing snow, reduced visibility, and wind chill conditions that add to overall winter weather severity.
The raw score is then adjusted by a regional factor. Locations that rarely experience significant snowfall respond differently to the same forecast conditions than those in areas where heavy winters are the norm. The calculator accounts for this automatically based on your location.
For a full breakdown of the data sources, see the Data Sources page.
How Much Should You Trust the Result?
The Snow Day Calculator provides a weather-based estimate, not an official school closure decision. Weather conditions and forecasts can change, and each school or district makes its own decision based on local circumstances — including road conditions, transportation availability, staffing, and policies that this calculator cannot know.
Always check your school, district website, or local authority for the official announcement before making decisions.
A few things to keep in mind:
- A high score means the forecast strongly favours closure conditions — it does not mean school is definitely cancelled.
- A low score means conditions look mild based on the current forecast — it does not mean school will definitely stay open.
- The forecast confidence badge (High / Medium / Low) shown with each result reflects how consistent and settled the forecast data appears. Lower confidence means the forecast has more variability and could shift.
- We do not publish a formal accuracy rate. Closure decisions vary too much by district to make a single number meaningful.
Understanding Your Snow Day Result
The result card shows several pieces of information to help you interpret the estimate:
Score of 60% or above. The forecast indicates strong winter weather conditions for your location and region.
Score between 35–59%. Conditions are notable but not conclusive. Delays or selective closures are possible.
Score below 35%. Current forecasts show limited winter weather severity for your area.
Alongside the main closure probability, the result also shows a 2-Hour Delay probability. Districts sometimes opt to open late rather than cancel entirely when conditions are significant but not severe enough for a full closure.
The weather tiles beneath the result show the individual forecast values — expected snowfall, temperature low, wind chill, and precipitation probability — that fed into the estimate. These can help you understand what is driving the score.
Frequently Asked Questions
Have a different question? Visit our full FAQ page or send us a message.