Frequently Asked Questions
What is the heat index?
The "feels like" temperature combining heat and humidity. High humidity slows sweat evaporation, making it harder to cool down. The Steadman formula models this.
When is heat index dangerous?
NWS categories: 80-90°F caution, 90-103°F extreme caution (heat cramps), 103-124°F danger (heat exhaustion likely), above 125°F extreme danger (heat stroke).
Why does humidity make heat feel worse?
Sweat must evaporate to cool you. In humid air it evaporates slowly, so body temperature rises. Dry heat (low humidity) is more tolerable at the same temperature.
When does the heat index formula apply?
It is valid for shade with light wind, at temperatures above ~80°F and humidity above 40%. Direct sun can add 15°F to the perceived temperature.
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