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Hypothermia is subnormal body temperature, a lowering of the body core temperature. When you lose enough body heat, you become hypothermic. Cold water robs the body of heat 25-30 times faster than air. Depending on the waters' temperature, 10 or 15 minutes, your core body temperature (brain, spinal cord, heart, and lungs) begins to drop. Your arms and legs become numb and useless. You may lose consciousness and drown before your core temperature drops low enough to cause death. Unconsciousness can occur when body core temperature drops from normal (98.6°F/37°C) to about 86°F/30°C. Safety experts estimate that half of all drowning victims die from the fatal effects of cold water, not from water filled lungs.

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Three things determine a hot day: Temperature, humidity and wind speed. When the Temperature approaches 90 degrees, the humidity approaches 90%, with little wind, there is the danger of heatstroke or heat exhaustion. Hyperthermia is a sudden and uncontrolled rise in body Temperature caused by the inability of the Temperature-regulating cells in the brain to increase the body's mechanisms of dissipating heat. The greater the degree of dehydration, the more likely heatstroke will develop. The harder you exercise, the less dehydration you can tolerate.

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