The Heat index refers to the perceived temperature based on the measured air temperature and relative humidity.
The heat index is a value used by US meteorologists to describe the influence of the measured air temperature and humidity on the human body.
|26–32 °C||Caution: fatigue is possible with prolonged exposure and activity. Continuing activity could result in heat cramps.|
|32–41 °C||Extreme caution: heat cramps and heat exhaustion are possible. Continuing activity could result in heat stroke.|
|41–54 °C||Danger: heat cramps and heat exhaustion are likely; heat stroke is probable with continued activity.|
|over 54 °C||Extreme danger: heat stroke is imminent.|