Humidity Index Calculator
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The heat index, also known as the "apparent temperature" or "feels like" temperature, was developed by Robert G. Steadman in 1979. His groundbreaking paper "The Assessment of Sultriness" established the scientific foundation for understanding how humidity affects human temperature perception. The index combines air temperature and relative humidity to estimate how hot it actually feels to the human body.
The heat index, also known as the "feels like" temperature, combines air temperature and relative humidity to determine how hot it actually feels to the human body. It's important because high humidity reduces our body's ability to cool through sweating.
The heat index is calculated using the Rothfusz regression, a complex formula that considers temperature and relative humidity. The formula includes multiple terms to account for the non-linear relationship between these variables and how they affect human comfort.
The comfort levels are based on the calculated heat index: "Normal" indicates comfortable conditions (heat index below 75°F/24°C), "Caution" suggests moderate risk (75-80°F/24-27°C), and "Danger" indicates high risk of heat-related illnesses (above 80°F/27°C).
High humidity makes it harder for sweat to evaporate from our skin, which is our body's primary cooling mechanism. When humidity is high, even moderate temperatures can feel much warmer because our natural cooling system becomes less effective.