Understanding the Risk
Hypothermia occurs when the body loses heat faster than it can produce it, causing core body temperature to drop below the level needed for normal organ function. In polar and Arctic environments, the combination of extreme cold, wind, and wet conditions makes this a genuine, life-threatening risk — even for experienced travelers.
Critically, hypothermia doesn't only strike in blizzard conditions. It can develop during mild cold if a person is wet, exhausted, improperly dressed, or exposed to wind for an extended period. Awareness and preparation are your best defenses.
Recognizing the Stages of Hypothermia
Mild Hypothermia (Core temperature: 32–35°C / 90–95°F)
- Shivering (this is the body's warming mechanism — it's a warning sign, not something to dismiss)
- Pale, cold skin
- Slurred speech
- Clumsiness and poor coordination
- Difficulty with complex tasks
Moderate Hypothermia (Core temperature: 28–32°C / 82–90°F)
- Shivering may stop (a dangerous sign — the body is no longer able to warm itself)
- Increasing confusion and irrational behavior
- Muscle stiffness
- Drowsiness
Severe Hypothermia (Core temperature: below 28°C / 82°F)
- Unconsciousness
- Very slow or absent pulse and breathing
- Pupils may be dilated
- Skin may appear waxy or bluish
Severe hypothermia is a medical emergency requiring immediate evacuation. Do not assume a patient is dead until they are "warm and dead" — cold slows metabolism dramatically and survival has been recorded at very low core temperatures.
Prevention: The Most Important Strategy
Dress Appropriately
The layering system is your primary defense. Always use a moisture-wicking base layer, an insulating mid-layer, and a windproof/waterproof outer shell. Protect extremities with insulated gloves, wool socks, and a hat — significant heat is lost through the head and hands.
Stay Dry
Wet clothing loses up to 90% of its insulating value. Avoid getting wet from external sources (waterproof outer layers) and from internal sweating (regulate your pace and ventilate layers during high-activity periods).
Stay Fueled and Hydrated
Your body generates heat by burning calories. Cold-weather environments demand significantly higher caloric intake. Carry high-energy snacks (nuts, chocolate, energy bars) and eat regularly. Dehydration also impairs thermoregulation — drink water consistently, even when you don't feel thirsty in the cold.
Know Your Limits and the Weather
Check weather forecasts before any outdoor activity. Wind chill dramatically increases effective temperature — a -10°C day with 30km/h winds feels like -20°C on exposed skin. Plan conservatively: return before exhaustion, not after it.
Field Treatment for Hypothermia
- Move the person out of the cold and wind — shelter is the immediate priority
- Remove wet clothing carefully — do not rub the skin, which drives cold blood to the core
- Insulate the entire body — including the ground beneath them (sleeping pad, spare clothing)
- Apply gentle external warmth — body heat from a companion in a sleeping bag, chemical heat packs to the armpits and groin (not directly on skin)
- If conscious and able to swallow — give warm, sweet drinks (not alcohol)
- Keep the person horizontal — cold blood from the limbs can cause cardiac shock if the person stands suddenly (afterdrop)
- Call for emergency evacuation — moderate and severe hypothermia require professional medical treatment
Frostbite: A Related Risk
Frostbite occurs when tissue freezes. Fingers, toes, ears, and noses are most vulnerable. Early frostbite (frostnip) causes numbness and pale skin — rewarm gently and immediately. Deep frostbite causes hard, waxy, blistering tissue and requires professional medical treatment. Do not rub frostbitten tissue. Rewarm frozen extremities only if there's no risk of refreezing — refreezing thawed tissue causes far worse damage.
Emergency Communication
Always carry a personal locator beacon (PLB) or satellite communicator in polar environments where cellular coverage is non-existent. Inform a trusted contact of your route and expected return time before every trip into the field.
Final Thoughts
Cold-weather injuries are largely preventable. Respect the environment, prepare thoroughly, travel with a companion where possible, and never allow pride or summit fever to override sound judgment. The mountains and ice will always be there for another day.