Snow Day Calculator
Estimate the probability of a snow day school closure based on forecasted snowfall, temperature, wind speed, and school type.
inches
°F
mph
Snow Day Probability
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Verdict —
Severity Score —
How to Use This Calculator
- Enter the Expected Snowfall from the weather forecast.
- Enter the forecast Temperature during the storm.
- Enter the forecast Wind Speed.
- Select your School Type for a more accurate estimate.
- The calculator gives a probability percentage and verdict.
Formula
Probability is scored from snowfall (up to 40 pts), temperature (up to 25 pts), and wind (up to 20 pts), then scaled by school type.
Example
Forecast: 8 inches of snow, 20°F, 20 mph winds, public school.
- Snow score: 30 + Temperature: 15 + Wind: 12 = 57 points
- Snow Day Probability: ~57% — Good chance!
Frequently Asked Questions
- This calculator scores snowfall amount, temperature, and wind speed, then adjusts based on school type. Public schools cancel more readily than private schools or universities.
- Generally, 4+ inches typically triggers consideration for closures. 8+ inches with cold temperatures makes closures very likely. Local terrain and resources also play a role.
- Universities cancel much less frequently, as students are expected to make their own decisions. K-12 schools also prioritize bus safety, making them more likely to close.
- Ice (freezing rain) is often more disruptive than snow. Power outages, road conditions, and timing of the storm (overnight vs. morning) also strongly influence decisions.