University of Illinois Extension

The Heat Index

 Photo: NWS

Photo: NWS
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To help decide if temperature and humidity levels are dangerous, the National Weather Service developed the Heat Index. By looking at temperature and humidity, we can then decide if any outdoor activity could be harmful to us. For example, a temperature of 95° F combined with a 50 percent relative humidity, gives a heat index of 107° F. Heat exhaustion is possible if too much physical activity is done in these conditions. Be careful.

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