Heat Index - Effects of The Heat Index (shade Values)

Effects of The Heat Index (shade Values)

Celsius Fahrenheit Notes
27–32 °C 80–90 °F Caution — fatigue is possible with prolonged exposure and activity. Continuing activity could result in heat cramps
32–41 °C 90–105 °F Extreme caution — heat cramps and heat exhaustion are possible. Continuing activity could result in heat stroke
41–54 °C 105–130 °F Danger — heat cramps and heat exhaustion are likely; heat stroke is probable with continued activity
over 54 °C over 130 °F Extreme danger — heat stroke is imminent

Exposure to full sunshine can increase heat index values by up to 8 °C (14 °F).

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