Calculadora de Sensação Térmica (Wind Chill)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
WC = 13,12 + 0,6215T − 11,37v^0,16 + 0,3965T·v^0,16
About this calculator
The Wind Chill Calculator estimates the perceived temperature by the human body under wind and cold conditions, using the National Weather Service (NWS) formula. It considers the actual air temperature (T, in °C) and wind speed (v, in km/h, with v > 4.8 km/h) to calculate the additional cooling caused by wind. The formula is: WC = 13.12 + 0.6215T − 11.37v^0.16 + 0.3965T·v^0.16. The result indicates how cold the environment actually 'feels' to exposed skin.
This tool is useful for planning outdoor activities in cold climates, such as hiking, winter sports, or outdoor work. For example, with a temperature of -5°C and wind of 30 km/h, the wind chill can drop to -12°C, increasing the risk of hypothermia or frostbite. The calculator helps decide appropriate clothing and safe exposure time, being especially relevant in southern and southeastern Brazil during cold waves.
Important precautions: the formula is valid only for temperatures below 10°C and winds above 4.8 km/h. Above 10°C, wind does not cause significant cooling. Additionally, wind chill does not account for humidity, solar radiation, or individual characteristics (such as metabolism or clothing). For extreme heat, use the Heat Index. Always prioritize safety: at very low wind chills, avoid prolonged exposure.
Frequently asked questions
Does the calculator work for temperatures above 10°C?
No. The wind chill formula is valid only for air temperatures at or below 10°C. Above that, wind does not cause significant cooling.
What unit is used for wind speed?
The calculator uses km/h. If you have wind speed in other units, convert first: 1 m/s = 3.6 km/h; 1 mph = 1.609 km/h.
Why must wind speed be greater than 4.8 km/h?
Below that speed, the wind cooling effect is negligible and the formula is not accurate. For calm winds, the wind chill is approximately equal to the actual temperature.
Does wind chill consider humidity?
No. Wind chill only considers temperature and wind. To assess discomfort from heat and humidity, use the Heat Index.
What is the risk of frostbite with very low wind chill?
With wind chill below -20°C, the risk of frostbite on exposed skin increases significantly within 30 minutes. Below -30°C, risk is high within 10 minutes. Protect yourself adequately.