Written by
Amit Kulkarni
Founder & Editor-in-Chief
Software engineer with 7 years of experience building accurate, reliable calculators. Committed to providing expert-verified tools for finance, health, education, and utilities.
Find out the real-time probability of a snow day in your area. Enter your ZIP code to check if your school might close tomorrow due to snow, ice, or severe winter weather.
Enter your ZIP code to get real-time snow day predictions
This calculator uses real-time data from the National Weather Service (NWS) to predict snow day probability:
Note: This is a prediction tool based on weather data. Actual school or workplace closures are decided by local authorities. Always check official sources for closure announcements.
A Snow Day Calculator is a simple, intelligent online tool that predicts the likelihood of a snow day, a day when schools, offices, or transportation services might close because of heavy snowfall or unsafe winter conditions.
By entering your ZIP code, the calculator fetches real-time weather forecasts and estimates the chance that your local schools or workplaces will shut down. It's designed primarily for students, parents, teachers, and workers living in snow-prone regions of the United States who want to plan ahead before the winter weather hits hard.
In plain terms, this tool gives you an easy-to-read percentage chance, like "There's a 72% chance of a snow day tomorrow." That number isn't just random; it's calculated using real weather data and predictive factors such as temperature, snowfall amount, timing of the storm, and even local commuting hours.
Whether you're hoping for a day off or preparing for difficult travel conditions, the Snow Day Calculator gives you the insights you need, accurate, quick, and free.
The calculator uses a combination of official U.S. weather data and a logical scoring system to predict the likelihood of closures or major disruptions caused by snow. Here's a simplified breakdown of how it works behind the scenes:
The calculator connects directly to the National Weather Service (NWS) API, a free and highly reliable government source of weather data. It fetches real-time weather forecasts, including:
Since the NWS API works with latitude and longitude, the calculator first converts your ZIP code into coordinates. Example: ZIP code 10001 (New York) → Latitude 40.75, Longitude -73.99
Using your coordinates, the calculator fetches a detailed forecast from NWS. This provides links to hourly and daily forecasts, showing snowfall, temperature, and probability of precipitation.
Once the forecast is retrieved, the calculator evaluates:
All of these factors are combined into a weighted formula that gives a final snow day probability (0–100%).
The result is displayed as a percentage chance, along with a friendly explanation like: "Heavy snowfall expected overnight with 3–5 inches accumulation and below-freezing temperatures. High chance of school closures tomorrow." This transparency makes it easy for users to understand why they're getting that result.
No more staying up late refreshing weather apps or guessing whether school will close. Get an early idea if you'll need to prepare for a day at home.
Plan your lesson schedules, online class preparations, or school communications based on real-time predictions.
Predict potential road disruptions or delays before you set out in the morning. Save time and stay safe.
It's not just for schools, anyone living in snow-prone areas can use it to check local snow severity and plan travel or events.
If you love winter weather, this tool gives you accurate, up-to-date snow forecasts in an easy, visual way.
Forecast: "Snow likely. Cloudy, with a low around 30°F. New snow accumulation of 2–4 inches possible."
Precipitation: 70%
Timing: Overnight into morning commute
Snow Day Chance: 82% (Very High)
Expect slippery roads and possible school delays or closures.
Forecast: "Light snow showers. Low around 33°F. Little or no accumulation expected."
Precipitation: 40%
Timing: Early morning only
Snow Day Chance: 38% (Low)
Snow expected but not severe enough for closures.
Forecast: "Heavy snow throughout the day. 4–6 inches possible. Temperature 28°F."
Precipitation: 90%
Snow Day Chance: 94% (Very High)
Most likely a snow day, expect widespread school and transport shutdowns.
This calculator provides an estimated probability based on real-time NWS (weather.gov) forecasts and a proprietary predictive formula. Actual closure or delay decisions are made by local authorities or organizations. Always verify with your school district or workplace for official announcements.
The Snow Day Calculator blends science, data, and simplicity to help Americans stay prepared during winter. Whether you're a student praying for a surprise holiday, a parent planning your commute, or a teacher scheduling remote lessons, this calculator gives you an instant, trustworthy answer, backed by the National Weather Service.
Stay informed. Stay safe. And if it looks like a snow day… maybe go make that hot cocoa.
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View All Utilities CalculatorsFounder & Editor-in-Chief
Software engineer with 7 years of experience building accurate, reliable calculators. Committed to providing expert-verified tools for finance, health, education, and utilities.