Temperature
Appropriate cold-weather gear can negate the damage from severe cold or reduce the damage from extreme cold to that of particularly severe cold.
| Category | Temperature | Fatigue | Damage |
|---|---|---|---|
| Incredible cold | –80°F or colder | 2 hours | Moderate cold every minute |
| Extreme cold | –79°F to –20°F | 4 hours | Minor cold every 10 minutes |
| Severe cold | –21°F to 12°F | 4 hours | Minor cold every hour |
| Mild cold | 13°F to 32°F | 4 hours | None |
| Normal | 33°F to 94°F | 8 hours | None |
| Mild heat | 95°F* to 104°F* | 4 hours | None |
| Severe heat | 105°F* to 114°F | 4 hours | Minor fire every hour |
| Extreme heat | 115°F to 139°F | 4 hours | Minor fire every 10 minutes |
| Incredible heat | 140°F or warmer | 2 hours | Moderate fire every minute |
| * Adjust temperatures down by 15° in areas of high humidity. | |||