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Heat index is a measure that combines temperature and humidity to determine how hot it actually feels to the human body. When humidity is high, sweat cannot evaporate effectively, making it feel significantly hotter than the actual temperature. For example, a temperature of 97°F with high humidity can feel like 108°F. This is why air conditioning is essential in hot climates, and why people in regions without air conditioning face higher risks of heat-related illness and death during heat waves.