Or, you could simply reference this chart: Here’s the equation, where T is air temperature (F), and R is relative humidity (%): Want to calculate the heat index on your own? Be my guest. If you’ve been watching “Weather on the 1s” lately, you’ve probably heard us use the term “heat index” or “feels like” temperatures to describe how hot it feels. Even on a 100 degree day, it can feel a little cooler to the body if the air is dry because sweat evaporates quickly. The opposite occurs if the air is very dry. So when the relative humidity of the air is high, meaning the air has a high moisture content, the sweat evaporation process slows down. Our body produces sweat to help keep us cool, but that only works if the sweat evaporates, because evaporation is a cooling process. It refers to the fact that high humidity makes it feel hotter than the actual air temperature. “It’s not the heat, it’s the humidity.” Ever heard that phrase? I hear it all the time in the summer, and have even said it several times on TV.
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