Snow Day Predictor (snowdaypredictor.xyz) is a website that helps students, parents and teachers, in the United States and Canada. It was started in 2025. The site lets you type in a city name or ZIP code or postal code. You get a forecast away. This forecast shows the chance that school will be closed for seven days because of winter weather. The chance changes every day based on the weather.
The tool is designed for people who want to know if their school might close without needing an app or signing up. There’s no account to create. No cost to use. People choose their school level Elementary, Middle School, High School or College. Get a probability score that fits their school type. That’s because each kind of school has rules, for when they’ll shut down.
How Snow Day Predictor Works
Snow Day Predictor uses real-time weather data, from meteorological APIs. It processes this information through a weighted algorithm. The system looks at atmospheric factors and logistical conditions all at once. It then gives an estimated chance of school closure as a percentage.
The Prediction Algorithm Factor Weights
The platform's publicly documented scoring model works as follows:
❄ Snow Day Probability Score: How Each Factor Contributes
The algorithm shows a pattern that school districts often follow: how much rain falls is the important factor in deciding to close school.. Very cold or very hot weather and strong winds can also cause closures. This is especially true, for kids who wait outside for the bus.The weekend exclusion rule ensures the tool never delivers false positives on days when schools are already closed.
Data Infrastructure
The service takes in real-time weather forecast data for seven days from meteorological sources. Snow day prediction systems today often get their information from places, like the NOAA National Weather Service, the Open-Meteo API or commercial providers that offer hourly grid forecasts. Using data instead of old climate averages helps the tool keep up with fast-changing winter storms and give accurate results.
Key Features of Snow Day Predictor
ZIP Code & City Lookup
Just type a city name, for instant hyperlocal results.
Plan ahead for the full school week. See daily snow day probability scores for the next seven days at once.
School-Level Customization
Choose Elementary, Middle School, High School, or College for a probability score calibrated to how each level historically responds to weather.
°F / °C Toggle
Seamless switch between Fahrenheit and Celsius essential for Canadian users and families relocating between countries.
American coverage is comprehensive with dedicated pages, for every state and province. A leaderboard of cities highlights the most popular locations.
Shareable Results
Share your snow day probability results with family, classmates or, on media in just one tap.
Calculation Statistics
A public dashboard displays how many calculations have been performed over time. This adds proof and transparency to the platform. The dashboard lets anyone see the work that has taken place.
Completely Free
No account, no subscription, no hidden fees. Open to anyone with a browser on desktop or mobile.
Snow Day Predictor offers forecasts for every U.S. State and every Canadian province and territory. .. Dedicated state-level pages (e.g., snowdaypredictor.xyz/states/new-york) aggregate regional predictions and surface the most commonly checked cities within each state.
How Accurate Is Snow Day Predictor?
Snow day predictions are very tricky. They depend a lot on how ahead the forecast is looking. They also depend on how good the weather data's. If the data is not accurate the prediction will not be good. If the forecast is far out it is harder to be right. The same is true, for snow day predictions. They need data and a short time frame to be accurate. Snow day predictions are tricky. They need data and a short time frame to be accurate. The accuracy of snow day predictions depends on the time frame and the data. The accuracy of snow day predictions depends on the time frame and the data. Based on industry benchmarks for this category of tool:
12–24 hours out: 70–85% accuracy (best window)
24–48 hours out: 55–70% accuracy
3–7 days out: 40–55% accuracy (storm-track uncertainty)
The best time to check is in the evening, between 6 and 10 PM right before a storm might hit. That’s when the latest weather models have absorbed all the day’s observations and the forecast becomes clearer with uncertainty. A second check should be done early in the morning between 5 and 6 AM on the day of the storm. This one catches any updates that came in overnight and matches the time when most superintendents make their decisions.
Storm timing errors can make a difference. If a storm arrives two hours later than predicted road crews might have time to clear the roads. That could turn what was expected to be a snow day, into a school day. Sometimes the difference of a few hours changes everything.
- Precipitation-type transitions: The boundary between snow, sleet, and rain is notoriously difficult to model, particularly across the Mid-Atlantic and interior New England.
- Superintendent variability means that every district has a hidden rule for when to close schools. This rule is shaped by the way leaders think, by the boards policies by how many snow daysre left and, by how much risk the district is ready to take on. I find that no weather forecast can fully understand all of these factors.
- Spatial resolution limits can be a challenge. A school district that covers elevations might see very different conditions all within its own borders. The same district might have students facing snow and others facing heat all, in the day. This makes planning and resources tricky. With the same policies the actual experience varies a lot. That’s why spatial resolution matters much
How to Use Snow Day Predictor Step-by-Step
- Navigate to snowdaypredictor.xyz on any device no download or account required.
- Enter your location.
- Select your school level. Choose Elementary, Middle School, High School or College, from the dropdown. This calibrates the probability to your institution's typical closure threshold.
- Choose your temperature unit — toggle between °F and °C as needed.
- Click "Check Snow Day Chances ❄️" — the tool fetches live forecast data and returns your 7-day probability forecast within seconds.
- Read your results — each day in the forecast displays a probability score. A score above 70% is generally worth planning around; scores above 85% are high-confidence.
- Share your results — use the built-in share function to send forecasts to family or friends.
Snow Day Predictor vs. Other Tools
Several platforms offer snow day predictions or school closure information. Here is how Snow Day Predictor compares against the landscape:
| Tool | 7-Day Forecast | School-Level Input | Canada Coverage | Free | Probability Score |
|---|---|---|---|---|---|
| Snow Day Predictor | ✔ | ✔ | ✔ 13 Provinces | ✔ | ✔ % score |
| Snow Day Calculator (original) | ✗ | ✔ | ✔ Partial | ✔ | ✔ % score |
| AccuWeather Winter Center | ✔ | ✗ | ✔ | Partial | ✗ Impact scale |
| The Weather Channel / weather.com | ✔ | ✗ | ✔ | Partial | ✗ |
| Local TV Station Snow Day Tools | ✗ | ✗ | ✗ Region-only | ✔ | Varies |
| District Notification Apps (ParentSquare, Remind) | ✗ | N/A | Varies | Varies | ✗ Confirmation only |
Snow Day Predictor's primary differentiator is the combination of a 7-day window, school-level calibration, a clear probability percentage, and full North American coverage — all at no cost. Competing tools tend to excel in one or two of these areas but rarely all four simultaneously.
The Meteorological Science Behind the Tool
Snow Day Predictor sits at the intersection of modern numerical weather prediction and administrative decision-making science. Understanding the underlying meteorology helps explain why the tool's factor weights are set the way they are.
Why 5 Inches of Snow Is the Key Threshold
A 5-inch snowfall threshold (+40% in the algorithm) reflects the operational reality of bus transportation. Most school districts operate yellow bus fleets on fixed routes. Accumulations below 3–4 inches are generally manageable with pre-treatment (salt, brine application) and light plowing. Once accumulations reach 5+ inches especially if falling rapidly overnight road treatment capacity is typically overwhelmed, making safe bus operations untenable by the 6–7 AM departure window.
Extreme cold, when temperatures drop below 20 degrees Fahrenheit or negative seven degrees Celsius creates a danger. Even if there is no snow the wind chill at bus stops can quickly become dangerous. Children waiting outside for the bus are especially, at risk because their skin can freeze in minutes. This cold is not just uncomfortable; this cold can lead to frostbite without snow. On cold days extra precautions should be taken to protect young children from harm. Many districts in the Midwest and Northeast have clear rules about closing schools on cold days. These rules are based on wind chill levels. The +20% weighting shows how often schools actually follow these rules. This number comes from data, about how schools make decisions during cold weather.
Winds greater than 15 mph or 24 km/h make both snow and cold more dangerous. Blowing and drifting snow makes it hard to see for drivers. Can quickly cover roads that have just been cleared. The wind also makes the cold feel even worse which is a risk for people waiting at bus stops. Winds greater than 15 mph or 24 km/h make both snow and cold more dangerous. Blowing and drifting snow makes it hard to see for drivers. Can quickly cover roads that have just been cleared. The wind also makes the cold feel even worse which is a risk, for people waiting at bus stops. The +10% weight for high winds is a conservative but empirically grounded modifier.
Who Uses Snow Day Predictor?
- Teachers and School Staff — Use the forecast to decide whether to prepare lesson plans for virtual instruction or remote continuation activities.
- Working Adults and Commuters — While the tool is framed around school closures, the underlying weather probability data is useful for anyone trying to assess whether to work from home or commute on a potentially dangerous day.
- Weather Enthusiasts and Hobbyists — Track the tool's predictions against outcomes to benchmark its accuracy versus other forecast services.
Other Tools on Snow Day Predictor
Beyond the core snow day calculator, the platform hosts a suite of 23+ calculators spanning weather, health, and utility domains: