Heat is the number one weather-related killer in the United States. On average, excessive heat claims more lives each year than floods, lightning, tornadoes and hurricanes combined. When the body heats too quickly to cool itself safely, or when you lose too much fluid or salt through dehydration or sweating, your body temperature rises and heat-related illness may develop.
Each year, dozens of children left in parked vehicles die from hyperthermia even on mild days or with the windows slightly open. Hyperthermia is an acute condition that occurs when the body absorbs more heat than it can handle. Studies have shown that the temperature inside a parked vehicle can rapidly rise to a dangerous level for children, pets and even adults. The effects can be more severe on children because their bodies warm at a faster rate than adults.