Wind Chill & Feels-Like Calculator

Wind Chill Guide

Why Wind Makes You Colder

Wind chill occurs because moving air accelerates heat loss from exposed skin by removing the thin layer of warm air that the body naturally creates around itself. In still air, your skin warms the surrounding air creating an insulating layer. Wind strips this away, forcing your body to work harder to maintain core temperature. The wind chill formula was revised by the US National Weather Service and Meteorological Service of Canada in 2001 to better reflect human heat loss — the current version

Wind Chill vs Heat Index

Wind chill is the cold equivalent of the Heat Index (feels-like temperature in hot weather). Wind chill only applies at temperatures at or below 10°C and wind speeds above 5 km/h — at warmer temperatures, the formula doesn't apply. The Heat Index applies at temperatures above 27°C with high humidity. Both are measures of human heat stress — wind chill relates to cooling, heat index to overheating risk.

Frostbite Risk

Frostbite risk increases dramatically as wind chill drops. At a feels-like temperature of -15°C: frostbite can occur in 30 minutes on exposed skin. At -27°C: frostbite in 10 minutes. At -35°C: frostbite in 5-10 minutes. At -60°C: frostbite in under 2 minutes. Fingers, toes, ears, nose, and cheeks are most vulnerable. Wet skin cools approximately 25 times faster than dry skin — wet conditions in wind dramatically increase frostbite risk even at mild temperatures.

Dressing for Wind Chill

The most effective clothing system for cold and wind is layering: base layer (moisture-wicking, not cotton), mid layer (insulating fleece or down), outer layer (wind and waterproof shell). The outer shell is critical — even a thin windproof layer dramatically reduces effective wind chill. Exposed skin (face, hands) accounts for a disproportionate amount of heat loss — gloves, hats, and face covering are the most impactful items in cold wind. Cotton base layers accelerate heat loss when wet — avo