🌬 Wind Chill Calculator
Wind strips heat from exposed skin far faster than still air, so 30°F on a calm day and 30°F in a 20 mph wind feel nothing alike. This calculator applies the National Weather Service wind chill formula to give the feels-like temperature.
The formula is rated for air temperatures at or below 50°F and wind speeds of 3 mph or more. Below about -18°F wind chill, frostbite can strike exposed skin in 30 minutes or less.
How to use this calculator
Enter the air temperature in Fahrenheit and the wind speed in miles per hour. The calculator applies the National Weather Service wind chill formula and shows how cold it feels on exposed skin.
- Type the Air temperature in Fahrenheit.
- Type the Wind speed in miles per hour.
- Read the wind chill result instantly.
- Check the range note to confirm the inputs suit the formula.
Frequently asked questions
What does the Wind Chill Calculator compute?
It gives the feels-like temperature from the air temperature and wind speed using the official National Weather Service formula. Wind strips heat from skin faster than still air, so the result is usually well below the thermometer reading.
What is the wind chill formula?
Wind chill equals 35.74 plus 0.6215 times T, minus 35.75 times V to the 0.16 power, plus 0.4275 times T times V to the 0.16 power, with T in Fahrenheit and V in miles per hour.
Can you give a worked example?
At 30 degrees Fahrenheit with a 10 mph wind, the wind chill is 21.2 degrees Fahrenheit, so it feels about 9 degrees colder than the thermometer says.
When is the formula valid?
It is rated for air temperatures at or below 50 degrees Fahrenheit and wind speeds of 3 mph or more. Outside that range the tool still computes a number but flags that the formula is being used beyond its rated range.