How it works
Calculate the perceived temperature due to wind cooling effect.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
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?temp=Temperature (°F)Number · Optional · Default: 30
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?speed=Wind Speed (mph)Number · Optional · Default: 15
Outputs
1-
resultResultText · Primary output
result contains the calculator’s complete rendered result area, including its visible result cards, tables, charts, and messages.
Calculate the “perceived” winter temperature caused by wind speed
Description
The Wind Chill Calculator is a vital winter safety tool used to predict how cold the air actually feels on human skin. When the wind blows, it strips away the thin layer of warm air surrounding your body, causing you to lose heat much faster than in calm air. This tool uses the official National Weather Service formula to calculate the Wind Chill Index, helping you prepare for outdoor activities and identify the risk of frostbite.
Inputs
- Temperature (°F): The current air temperature (must be 50°F or lower).
- Wind Speed (mph): The current wind velocity (must be 3 mph or higher).
Outputs
- Wind Chill: The perceived “Feels Like” temperature in °F.
Chart
- N/A: This tool provides a direct numeric weather result.
“Good to Know”
- When it Applies: Wind chill is only calculated for temperatures at or below 50°F and wind speeds above 3 mph. At higher temperatures or lower wind speeds, the effect is negligible.
- Frostbite Risk: When wind chill drops below -15°F, frostbite can occur on exposed skin in 30 minutes or less. Below -30°F, the risk time drops to 10 minutes.
- Inanimate Objects: Wind chill does not affect inanimate objects like cars or water pipes. A car’s radiator will never drop below the actual air temperature no matter how hard the wind blows—though it will reach that temperature faster.
Examples
Example 1: Chilly Day
- Input: 35°F, 10 mph Wind
- Output: 27.4 °F
Example 2: Bitter Cold
- Input: 0°F, 20 mph Wind
- Output: -23.7 °F
Example 3: Light Breeze
- Input: 30°F, 5 mph Wind
- Output: 25.3 °F