| Category |
Heat Index |
Possible heat disorders for people
in high risk groups |
Extreme
Danger |
130°F or higher
(54°C or
higher) |
Heat stroke or sunstroke
likely. |
| Danger |
105 - 129°F
(41 - 54°C) |
Sunstroke, muscle cramps, and/or heat
exhaustion likely. Heatstroke possible with prolonged exposure
and/or physical activity. |
Extreme
Caution |
90 - 105°F
(32 - 41°C) |
Sunstroke, muscle cramps, and/or heat
exhaustion possible with prolonged exposure and/or physical
activity. |
| Caution |
80 - 90°F
(27 - 32°C) |
Fatigue possible with prolonged
exposure and/or physical
activity. |