Snow Day Closure Score Calculator
Explore a heuristic score from snowfall and local conditions. This is not a calibrated closure probability or forecast; check official district updates.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
About this calculator
This combines the entered weather and district details into an uncalibrated heuristic score. It is not a probability, forecast or prediction of a school closure. Weather forecasts, road conditions and district decisions can differ; check local official updates.
Worked example
calculated with the default values below
Expected snowfall 6 in · Temperature 20 °F · Wind chill 5 °F · Ice or freezing rain expected No · District type Suburban · When the snow arrives Overnight before school Heuristic score (not a probability) 48 points
Method and assumptions
P = clamp(0, 98, min(55, 5.5s) + C(T) + W(w) + 15i + d + t) Adds heuristic points for snowfall, temperature, wind chill, ice, district type and timing. The score is uncalibrated and is not a probability. This combines the entered weather and district details into an uncalibrated heuristic score. It is not a probability, forecast or prediction of a school closure. Weather forecasts, road conditions and district decisions can differ; check local official updates. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Data sources
The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
P = clamp(0, 98, min(55, 5.5s) + C(T) + W(w) + 15i + d + t)
- s
- Expected snowfall (in)
- T
- Temperature (°F)
- w
- Wind chill (°F)
- i
- Ice flag (0 or 15)
- d
- District adjustment
- t
- Timing adjustment
- C
- Temperature score (piecewise, see note)
- W
- Wind-chill score (piecewise, see note)
- P
- Probability of a snow day (%)
Adds heuristic points for snowfall, temperature, wind chill, ice, district type and timing. The score is uncalibrated and is not a probability.
Frequently asked questions
Is this a forecast probability?
No. This is an uncalibrated heuristic score, not a measured probability or weather forecast. Check official forecasts, road conditions and your school district’s closure announcement.
Which inputs and limits apply to Snow Day Closure Score Calculator?
Use the units shown beside each field. These are form limits, not recommended settings. Expected snowfall: 0–40 in; Temperature: -40–50 °F; Wind chill: -60–50 °F P = clamp(0, 98, min(55, 5.5s) + C(T) + W(w) + 15i + d + t) Adds heuristic points for snowfall, temperature, wind chill, ice, district type and timing. The score is uncalibrated and is not a probability. This combines the entered weather and district details into an uncalibrated heuristic score. It is not a probability, forecast or prediction of a school closure. Weather forecasts, road conditions and district decisions can differ; check local official updates. The references provide context and limitations. They do not validate this page’s illustrative multipliers, lookup values or predictions.
What is a complete worked example for Expected snowfall = 6 in; Temperature = 20 °F?
Inputs: Expected snowfall = 6 in; Temperature = 20 °F; Wind chill = 5 °F; Ice or freezing rain expected = No; District type = Suburban; When the snow arrives = Overnight before school. Calculation: P = clamp(0, 98, min(55, 5.5s) + C(T) + W(w) + 15i + d + t). Results: Heuristic score (not a probability) = 48 points.