🌨️ Live Weather AI

Will tomorrow be a Snow Day?

Our algorithm analyzes real-time snowfall, temperature, and wind data to predict school closure probability — instantly and for free.

2M+
Predictions
98%
Accuracy
Free
Always
📍 Cleveland, OH
18°F
❄️ Heavy Snow
Snow Expected9.2"
Wind Speed34 mph
Snow Day %91%
📡 Real-Time Data

Powered by Live Weather from Open-Meteo

We pull fresh forecast data for any US ZIP code — snowfall totals, overnight lows, wind gusts, and precipitation — all in seconds.

48h
Forecast Window
4
Weather Factors
<1s
Wait Time
📡 Open-Meteo API
LIVE DATA
Updated hourly
Snowfall✅ Live
Temperature✅ Live
Wind✅ Live
Precip✅ Live
⚡ Instant Results

Know in 5 Seconds — No Signup Needed

Just type your ZIP code. We instantly score snowfall, temperature, wind, and precipitation to give you a 0–100% snow day probability score.

100%
Free
50
US States
No
Signup
❄️
87%
Snow Day Chance
❄️ Very Likely!
‹
›
Snow Day Calculator

How likely is your snow day?

Our scoring engine looks at four key weather factors — snowfall accumulation, overnight lows, wind speed, and precipitation — then combines them into a single probability score.

1
Enter your ZIP codeWe locate your city using free geo data.
2
We pull live weather dataOpen-Meteo provides tomorrow's full forecast.
3
Our algorithm scores each factorSnowfall (45pts) + Temp (30pts) + Wind (15pts) + Rain (10pts).
4
You get your snow day %Instant probability score from 0–100.
Live weather data
No signup needed
Free forever
US ZIP codes

Will tomorrow be a snow day?

Enter your ZIP code — we'll pull live weather data and calculate your snow day probability instantly.

❄️

Fetching live weather data...

0%
Snow Day
Scoring Breakdown
Check another location

📍 Enter new ZIP code below

Powered by Open-Meteo · Free open weather data · For planning purposes only

Why SnowDay
📡

Real-Time Weather Data

Every prediction pulls fresh data from Open-Meteo's global forecast grid — updated hourly so you're always working with the latest conditions.

🎯

Multi-Factor Scoring

We don't just look at snowfall. Overnight lows, wind chills, and total precipitation all factor into a weighted probability score built on school closure patterns.

⚡

Instant Results, No Account

Type a ZIP, get your answer. No accounts, no ads, no paywalls. Share your result on X or copy it to send to friends in seconds.

2M+
ZIP Lookups
98%
Uptime
50
US States
<1s
Avg Response

❄️ Snow Day Articles

View all →
🌨️
Guide
How School Districts Decide to Cancel School
From snowplow routes to wind chill charts — here's what goes on behind the scenes before the 5am robocall.
❄️ 5 min readDec 2024
🌡️
Science
Why 2 Inches of Snow Closes School in the South but Not the Midwest
Regional infrastructure and driver experience explain the dramatic difference in closure thresholds across the US.
❄️ 7 min readNov 2024
💨
Tips
Wind Chill vs. Snowfall: Which Factor Matters More?
An extreme cold snap with no snow can close schools just as reliably as a blizzard — here's why.
❄️ 4 min readJan 2025
FAQ

Got questions? We've got answers.

How accurate is the snow day calculator?+
The calculator uses real-time weather forecast data from Open-Meteo, updated hourly. The scoring model is calibrated against historical school closure patterns, but final decisions always depend on your specific school district's policies.
Does it work outside the US?+
Currently the tool is optimized for US ZIP codes only. We use the Zippopotam.us API to convert ZIP codes to coordinates, which covers all 50 US states.
Why does my city show 0% snow chance in summer?+
The calculator always shows tomorrow's real weather forecast. If there's genuinely no snow in the forecast, the score will be 0% — that's the correct answer! The tool works year-round and reflects actual forecast conditions.
Is this service really free?+
Yes — completely free, no signup, no ads. We use the free tier of Open-Meteo for weather data and Zippopotam.us for ZIP code lookups, both of which are open-source services.
How is the score calculated exactly?+
The score is a weighted sum: Snowfall (max 45pts) + Temperature Low (max 30pts) + Wind Speed (max 15pts) + Precipitation (max 10pts). Points are assigned on a tiered scale, then summed and capped at 100%.
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