Wind Chill & Heat Index

Calculate apparent temperature from wind chill or heat index using NWS formulas.

Must be ≤ 50°F (10°C).
Must be greater than 3 mph.

Wind chill requires temperature ≤ 50°F and wind > 3 mph.

Feels Like (Wind Chill)
—°F
Danger Levels

Low Risk

> 35°F

Moderate

0 to 35°F

High Risk

-20 to 0°F

Extreme

< -20°F

Documentation

How It Works

This calculator uses the official NWS (National Weather Service) formulas to compute apparent temperature, accounting for wind chill in cold conditions and heat index in hot/humid conditions.

Wind chill uses the 2001 NWS formula based on heat transfer science and wind tunnel testing. Heat index uses the Rothfusz regression with adjustments for extreme humidity.

Formulas

Wind Chill:

WC = 35.74 + 0.6215T − 35.75V0.16 + 0.4275TV0.16

Heat Index:

Rothfusz Regression (NWS)

Last Updated: February 28, 2026

Source: National Weather Service (NWS) formulas.

Frequently Asked Questions
How to Use

About the Wind Chill & Heat Index

What it calculates

This wind chill & heat index computes engineering and applied physics quantities for circuits, fluids, and mechanical systems. Calculate apparent temperature from wind chill or heat index.

When to use it

Use for coursework, lab estimates, and quick technical calculations.

Example

Adjust the inputs above to model your specific scenario with the Wind Chill & Heat Index.

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