How long does it take to get hypothermia in 30 degree weather?
The chart below shows how long you can be exposed to certain temperatures before it will result in frost bite. For example, a temperature of 0°F and a wind speed of 15 mph creates a wind chill temperature of -19°F. Under these conditions frost bite can occur in just 30 minutes.
How long can a person survive in cold water?
|Water Temperature||Expected Time Before Exhaustion or Unconsciousness|
|32.5°||0.3°||< 15 minutes|
|32.5–40°||0.3–4.4°||15 – 30 minutes|
|40–50°||3.3–10°||30 – 60 minutes|
|50–60°||10–15.6°||1 – 2 hours|
- Symptoms of hypothermia include:
- Initial hunger and nausea will give way to apathy as the core body temperature drops.
- The next symptoms develop and are confusion, lethargy, slurred speech, loss of consciousness, and coma.
- Often the affected person will lie down, fall asleep, and die.
- The water temperature on the night of the Titanic sinking was thought to be about 28 degrees Fahrenheit, just below freezing. Such a temperature was of course lethally cold for all those passengers who had been forced to take to the open water to escape the sinking ship.
- Hypothermia is not caused by the external temperature directly. Hypothermia is caused by the core body temperature falling faster then biological processes can raise it. For mammals such as human beings, thermal regulation is generally sufficient to maintain homeostasis of body temperature well below 80 °F.
For example, a temperature of 0 degrees Fahrenheit and a wind speed of 15 miles per hour creates a wind chill temperature of -19 degrees. Under these conditions, frostbite can occur in just 30 minutes.
- The chart below shows how long you can be exposed to certain temperatures before resulting in frostbite. For example, a temperature of 0 degrees Fahrenheit and a wind speed of 15 mph creates a wind chill temperature of -19 degrees Fahrenheit. Under these conditions frost bite can occur in just 30 minutes.
- Since frostbite is brought on by freezing, you can't get frostbite if the air temperature is above 32 degrees F (0 degrees Celcius). And frostbite is more common at pretty low temperatures, well below freezing.
- First-aid care
- Check for hypothermia.
- Protect your skin from further exposure.
- Get out of the cold.
- Gently rewarm frostbitten areas.
- If there's any chance the affected areas will freeze again, don't thaw them.
- Take pain medicine.
- Don't walk on frostbitten feet or toes if possible.
- Know what to expect as skin thaws.
But if you're exposed to cold temperatures on a spring hike or capsized on a summer sail, you can also be at risk of hypothermia. Normal body temperature averages 98.6 degrees. With hypothermia, core temperature drops below 95 degrees. In severe hypothermia, core body temperature can drop to 82 degrees or lower.
- To prevent more serious problems, take action as soon as you notice early signs of frostbite or hypothermia.
- Get out of the cold, wind, rain, or snow if possible.
- Add warm layers of clothing.
- Eat carbohydrates.
- Drink fluids.
- Move your body to help warm your core.
- Warm up any area with frostnip.
- Call 911 if you suspect hypothermia.
- Restore Warmth Slowly. Get the person indoors.
- Begin CPR, if Necessary, While Warming Person. If the person is not breathing, start CPR immediately.
- Give Warm Fluids. Give the person a warm drink, if conscious.
- Keep Body Temperature Up.
- Follow Up.
- Hypothermia can occur indoors. You can lose a dangerous amount of body heat inside your home. Not having heat in the winter or keeping the heat turned down too low can also lead to hypothermia. “If you're wet, you get cold much quicker and the colder you are, the faster hypothermia can happen,” Dr. Waters says.
Updated: 2nd October 2019