What is a defining characteristic of wind chill?

Wind chill is a measure of how cold it feels outside when wind is factored into the temperature. It takes the actual air temperature and combines it with wind speed to reflect the increased cooling effect caused by the wind. As wind blows, it removes the thin layer of warm air that surrounds our bodies, leading to a perception of lower temperatures. Because of this, wind chill values are typically lower than the actual air temperature, indicating that people may experience colder conditions than what the thermometer shows.

This understanding is crucial for recognizing the potential dangers of exposure to cold weather. For example, a temperature of 30°F with a strong wind can feel much colder, leading to a higher risk of frostbite or hypothermia. Thus, the defining characteristic of wind chill being lower than the actual air temperature is essential for assessing weather conditions and protecting individuals from cold-related health risks.