Get your exact % chance of a school snow day tomorrow — powered by live weather forecasts and AI analysis.
99%Accuracy at 8"+ Snow
All USZIP Codes Supported
LiveWeather Data
Simple & Accurate
How Our Snow Day Calculator Works
We combine real-time weather data with an AI-powered prediction model to give you the most accurate snow day forecast available — completely free.
01
📍 Enter Your ZIP Code
Type any US ZIP code. We instantly pinpoint your location and pull the latest live weather forecast data for your exact area.
02
🌨 Analyze Weather Data
We analyze snowfall totals, overnight lows, wind speeds, ice accumulation probability, and storm timing for tomorrow's forecast window.
03
🤖 Get Your Prediction
Our AI model weighs every factor — including your school type and regional snow tolerance — to output a precise percentage chance of a snow day.
Prediction Accuracy
How Accurate Is It?
Our snow day predictor accuracy depends on predicted snowfall. The more snow is expected, the easier it is to predict a cancellation with high confidence.
95%+
8"+ Snow
Near-certain accuracy. School almost always cancels with 8+ inches of snowfall.
82%
4–8" Snow
High accuracy. Most districts cancel or delay at this range.
65%
1–4" Snow
Moderate. Outcome varies by district policy and storm timing.
50%
<1" Snow
Hard to predict — depends heavily on ice, wind, and local factors.
What We Measure
Key Factors in Snow Day Predictions
Our snow day calculator analyzes every major variable that school administrators consider when deciding to cancel school.
❄️
Snowfall Accumulation
The single most important factor. Even 4–6 inches can cancel school in regions without snow-clearing equipment. We forecast total accumulation during the overnight and morning commute window.
🌡️
Temperature & Wind Chill
Dangerously cold wind chill temperatures can close schools even without snow. We factor in the overnight minimum temperature and morning wind chill to assess student safety risk.
💨
Wind Speed & Gusts
High winds reduce visibility to near zero and create blizzard-like conditions. We track overnight and morning wind speeds that affect bus safety and road travel conditions.
🧊
Ice & Freezing Rain
A thin layer of ice is more dangerous than a foot of snow. Icy roads are the top cause of school bus accidents, so we always check for freezing rain and sleet probability.
🏫
School Type & Location
Rural school districts close for less snow than urban ones (better resources). Private and boarding schools set the highest thresholds for snow day cancellations.
⏰
Storm Timing
A storm peaking at 3am is far more likely to cause a snow day than one arriving at noon. We analyze the hourly forecast to determine when peak snowfall hits the morning commute window.
Frequently Asked Questions
Snow Day Calculator FAQ
Our predictor is highly accurate for locations expecting 6+ inches of snow (over 90% accuracy). For marginal amounts (1–4 inches), accuracy depends on local district policy. The calculator pulls live weather data, so checking in the evening or early morning gives the most current prediction.
The snow day calculator works for all 5-digit US ZIP codes. We use the Open-Meteo weather forecast API, which provides hyper-local weather data for every location in the United States. Just enter any valid ZIP code to get your prediction.
It varies significantly by region. In Southern states, 1–2 inches can close schools because they lack snow-removal equipment. In the Northeast or Midwest, districts typically need 6–12 inches for a full cancellation. Urban schools generally need more snow than rural ones to close. Our calculator weighs regional thresholds in every prediction.
Check at 8–11pm the night before for an early read, then again at 5–7am on the day of for the most precise prediction. School superintendents typically make their decision by 5–6am, so the early-morning forecast reflects the final conditions they're looking at.
Yes. A "medium" probability range (roughly 25–55%) often correlates with a 2-hour delay rather than a full cancellation. This is common when storms are expected to taper off by mid-morning, giving road crews time to clear routes before the school day begins.
Weather forecasting isn't perfect — storm tracks can shift, accumulations can come in lower than predicted, or overnight road crews may clear conditions faster than expected. Some districts are also more conservative about closures than others. Our model is highly accurate but can't account for every district-specific factor.
Completely free. SnowLoadCalculator pulls live weather data from free, open APIs and provides AI-generated predictions at no cost. There is no sign-up required, no app to download, and no subscription. Just enter your ZIP code and get your answer.
Currently, SnowLoadCalculator supports US ZIP codes only. Canadian postal code support is on the roadmap. The weather data provider (Open-Meteo) covers worldwide locations, so international support is planned in a future update.