Core Temperature Limit – The human body can function up to 104°F (40°C) before heatstroke and organ failure become life-threatening
Wet-Bulb Temperature Danger – A wet-bulb temperature of 95°F (35°C) (heat + humidity) is considered the upper survival limit for a few hours.
Survival in Extreme Heat – Humans have survived short exposure to hotter than 200°F (93°C) in saunas, but prolonged exposure leads to fatal dehydration.
Humidity Worsens Heat Tolerance – High humidity prevents sweat evaporation, making heat more dangerous even at lower temperatures.
Acclimatization Helps – Gradual exposure to heat can improve tolerance, but extreme heat will always be dangerous without proper hydration and cooling.
Signs of Heat Overload – Symptoms like dizziness, confusion, nausea, and rapid heart rate indicate the body is overheating and needs immediate cooling.