Heat Index Chart HEAT INDEX CHART - PLAN AHEAD & STAY SAFE How To Use Heat Index Locate today’s predicted high temperature across the top line (air temp.) Down the left side (relative humidity) locate today’s predicted humidity. Follow across and down to find “Apparent Temperature” or “What it feels like.” Keep in mind, this chart was devised for shady, light wind conditions, so exposure to full sun can increase values by up to 15°. Strong winds, particularly with hot, dry air can be extremely hazardous. Source: National Oceanic & Atmospheric Association & OSHA
HEAT INDEX
RISK LEVEL
PROTECTIVE MEASURES
• Less than 91°F (32°C)
• Lower (Caution)
• Basic heat safety and planning
• 91°F to 103°F (32°C to 39°C ) • 103°F to 115°F (39°C to 46°C) • Greater than 115°F (46°C)
• Moderate
• Implement precautions and heighten awareness • Additional precautions to protect workers
• High
• Very High to Extreme • Triggers even more aggressive protective measures
Likelihood of heat disorders with prolonged exposure or strenuous activity:
Extreme Caution Extreme Danger
Caution Danger
70°F 21°C
75°F 24°C
80°F 26°C
85°F 29°C
90°F 32°C
95°F 35°C
100°F 38°C
105°F 41°C
110°F 43°C
Air Temp.
Relative Humidity
Apparent Temperature (Degrees Fahrenheit)
0% 64°/18° 69°/21° 73°/23° 78°/25° 83°/28° 87°/30° 91°/33° 95°/35° 99°/37° 10% 65°/18° 70°/21° 75°/24° 80°/26° 85°/29° 90°/32° 95°/35° 100°/38° 105°/41° 20% 66°/18° 72°/22° 77°/25° 82°/27° 87°/30° 93°/34° 99°/37° 105°/41° 112°/44° 30% 67°/19° 73°/23° 78°/25° 84°/28° 90°/32° 96°/35° 104°/40° 113°/45° 123°/51° 40% 68°/20° 74°/23° 79°/26° 86°/29° 93°/34° 101°/38° 110°/43° 122°/50° 137°/58° 50% 69°/21° 75°/24° 81°/27° 88°/31° 96°/35° 107°/42° 120°/49° 135°/57° 150°/66° 60% 70°/21° 76°/24° 82°/27° 90°/32° 100°/38° 114°/45° 132°/56° 149°/65°
70% 70°/21° 77°/25° 85°/29° 93°/34° 106°/41° 124°/51° 144°/62° 80% 71°/22° 78°/25° 86°/29° 97°/36° 113°/45° 136°/58° 157°/69° 90% 71°/22° 79°/26° 88°/31° 102°/39° 122°/50° 150°/66° 170°/77° 100% 72°/22° 80°/26° 91°/33° 103°/42° 133°/56° 166°/74°
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