What is "wind chill" a measure of?

Wind chill is a measure of the perceived decrease in temperature on exposed skin due to the effects of wind. This phenomenon occurs because wind increases the rate of heat loss from the body. When the temperature is low and the wind is blowing, it can make the air feel significantly colder than it actually is.

For example, if the actual air temperature is 30°F but there is a wind blowing at 20 mph, the wind can make it feel like it's much colder, which can lead to a higher risk of frostbite or hypothermia. The wind chill index takes into account both the air temperature and wind speed to provide a standardized way to convey this perceived temperature to the public, allowing individuals to better prepare for the cold conditions.

This understanding is crucial for safety and health during winter conditions, especially for those spending extended periods of time outdoors.