Heat Index Calculator
NOAA "feels-like" temperature from air temp and humidity (Rothfusz regression).
How to Use
- Enter air temperature and relative humidity.
- Result shows heat index and NOAA risk band.
Input
Feels-like
NOAA Risk
Caution
80-90°F — fatigue with prolonged exposure
Extreme caution
90-103°F — heat cramps, heat exhaustion possible
Danger
103-124°F — heat stroke likely with continued activity
Extreme danger
125°F+ — heat stroke imminent
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