Wind Chill Calculator
Find how cold it feels from the air temperature and wind speed, using the US National Weather Service formula.
Results
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Quick Answer
Wind chill shows how cold the air feels on exposed skin. The US National Weather Service formula is 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16, with T in °F and V in mph. At 20°F with a 15 mph wind, it feels like about 6.2°F.
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Table of Contents
How This Wind Chill Calculator Works
Wind removes heat from your skin, so you feel colder than the air temperature. This calculator uses the formula published by the US National Weather Service. It works in US or metric units.
Quick explanation: colder air and stronger wind give a lower wind chill.
- Temperature: at or below 50°F (10°C).
- Wind speed: above 3 mph (4.8 km/h).
- Exposed skin: wind chill describes the effect on skin, not objects.
Core Formulas
- Wind chill (°F): 35.74 + 0.6215T − 35.75 × V^0.16 + 0.4275T × V^0.16
- Celsius to Fahrenheit: °F = °C × 9 ÷ 5 + 32
- km/h to mph: mph = km/h ÷ 1.609344
Worked Example
The air is −10°C, with a 30 km/h wind.
- −10°C = 14°F
- 30 km/h = 18.64 mph
- Wind chill = -3.1°F, or about -19.5°C
Staying Safe in the Cold
- Cover exposed skin: frostbite risk rises as wind chill falls.
- Wear layers: and keep dry.
- Check local warnings: your weather service gives advice for your area.
Frequently Asked Questions
It is how cold the air feels on exposed skin because of the wind.
The US National Weather Service uses a formula based on air temperature and wind speed. This calculator uses that formula.
It does not cool objects below the air temperature, but wind can make them cool down faster.
The National Weather Service defines wind chill only at or below 50°F, with wind above 3 mph.
Yes. Choose metric units, and the calculator converts the values for you.
References & Sources
| Source | Used For | Link |
|---|---|---|
| National Weather Service, Understanding Wind Chill | The wind chill formula. | https://www.weather.gov/safety/cold-wind-chill-chart |
| National Weather Service, Wind chill questions | When wind chill is defined. | https://www.weather.gov/safety/cold-faqs |