What It Is
A modern snow day predictor that estimates the chance of school closures based on live weather data and AI-driven analysis.
Why We Built It
Existing tools were outdated, slow, and unclear. We wanted something honest, fast, and transparent about how predictions are made.
How It Works
We combine live forecasts, snowfall predictions, temperature, wind chill, and regional patterns through a multi-factor prediction model.
Future Plans
Push notifications, district-specific closures, and integration with official school district data sources for higher accuracy.
Our Mission
Snow Day Calculation exists to give families, students, and teachers a fast, reliable, and honest estimate of whether school will be cancelled due to winter weather. We believe good predictions should be free, transparent, and easy to understand — not locked behind paywalls or wrapped in confusing jargon.
We're not affiliated with any school district or government agency. Every prediction is clearly labeled as an estimate, and we always encourage users to check their district's official channels for confirmed closures.
Our Prediction Model
Snow Day Calculation uses a multi-factor model that weighs the following inputs to generate a probability score from 0–100%:
- Snowfall forecast — total accumulation in inches or centimeters expected overnight and through morning
- Temperature — forecasted overnight lows below freezing significantly increase closure probability
- Wind chill — extreme wind chill can trigger closures even without heavy snowfall
- Precipitation probability — how likely precipitation is to fall at all
- Regional factor — southern cities close more readily than northern cities accustomed to heavy winters
For a full explanation of the data behind these predictions, see our Data Sources and Weather APIs pages.
Technology Stack
This site is built with modern web standards. The frontend uses vanilla HTML, CSS, and JavaScript — no heavy frameworks — for maximum performance and low latency. Weather data is fetched from the Open-Meteo API. Charts are rendered with Chart.js. Historical snowfall data is loaded on demand to minimize unnecessary API usage.
The site is deployed on Vercel's edge network, uses a service worker for offline support, and is optimized for Core Web Vitals to ensure fast, stable loading on any device.
Transparency & Trust
We take accuracy and honesty seriously. Every prediction comes with a confidence level and a plain-language explanation of the key factors driving it. We do not fabricate data, exaggerate accuracy, or make official claims. Our predictions are estimates — useful ones, but estimates.
Learn more about the data we use on our References page, or read about the author behind the site.
Disclaimer
Snow Day Calculation is an independent, unofficial educational tool. We are not affiliated with any school district, government agency, or meteorological service. Always check official school district announcements for actual closure information. Predictions are estimates only and should not be used as the sole basis for making decisions.