Weather Conditions Score Calculator
Compare weather inputs with a simple, unvalidated score. It is not an official forecast, warning, safety rating or travel recommendation.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
This calculator applies fixed, illustrative weights to the temperature, wind, precipitation amount, visibility and humidity you enter. The score is not calibrated against observed impacts or an official weather index. Use a local meteorological service for current forecasts and safety decisions.
Worked example
calculated with the default values below
Temperature 35 °F · Wind speed 20 mph · Precipitation amount (use a consistent period) 0.5 in · Visibility 5 miles · Relative humidity 80 % · Precipitation type Rain Illustrative score (0–100) 27 · Temperature points 2 · Wind points 15 · Precipitation points 5 · Visibility points 5 · Humidity points 0
General background references
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
I = min(100, s_T + min(25, 0.75 v) + min(25, 10 p + b) + s_V + s_H)
- s_T
- Temperature score (lookup)
- v
- Wind speed
- p
- Precipitation
- b
- Condition bonus: ice 15, storm 12, snow 5
- s_V
- Visibility score: 0 / 5 / 12 / 20
- s_H
- Humidity score (0 or 6)
Illustrative unvalidated model, not an official or safety index. T points: <0°F 25, <20 18, <32 10, >100 22, >90 14, else 2; wind=min(25,0.75×mph); precipitation=min(25,10×inches+bonus), bonus ice 15/storm 12/snow 5; visibility: ≥10 mi 0, ≥5 5, ≥2 12, else 20; humidity adds 6 only when RH>85% and T>75°F. Total capped at 100.
Frequently asked questions
Is this an official weather severity or safety index?
No. It is an illustrative score from fixed model weights, not a validated or official index, forecast, warning or safety recommendation. Use local meteorological services for current conditions and decisions.