You checked the temperature before taking your dog out on a morning run. When the door opens, however, the two of you are greeted by a blast of heat. The temperature seems much hotter than it actually is.
Although the thermometer may read 75 degrees Fahrenheit, the Temperature-Humidity Index makes it feel much hotter. The index is a term used since 1959 to indicate the degree of discomfort caused by the combination of temperature and humidity in warm weather. The Temperature-Humidity Index (usually just called the Heat Index) is like the wind chill factor during winter when the wind makes the temperature feel colder than it actually is.
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