How cold is the deepest part of the ocean?

In fact, no matter how warm it is up top, by the time the sub has sunk to a depth of just 1,000 meters (3,280 feet), the water temperature is about 40ºF. From there it continues to drop until, 7,200 feet down, where the smokers are, the temperature is only about 2º to 3ºC (35ºF)—just above freezing!



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The bathypelagic is between 3,300 and 13,100 feet (1,000 and 4,000 m) beneath the ocean surface. It is an area void of light (called aphotic) and at 39 degrees Fahrenheit (4 degrees Celsius), it is very cold.

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This holds true up to 36,000 feet msl. So, while your standard temperature at msl is 15° C or 59° F, your standard temperature at 20,000 feet msl will be -24.6°C or -12.3°F.

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The baseline temperature of outer space is 2.7 kelvins — minus 454.81 degrees Fahrenheit, or minus 270.45 degrees Celsius — meaning it is barely above absolute zero, the point at which molecular motion stops. But this temperature is not constant throughout the solar system.

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“Aircraft at cruising altitude will often experience temperatures of minus 50 to minus 70 F for hours on end.” Generally, engines like cold weather. Since cold air is denser than warm air, engines provide more power because there are more oxygen molecules.

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According to USA Today, the common cruising altitude for most commercial airplanes is between 33,000 and 42,000 feet, or between about six and nearly eight miles above sea level. Typically, aircraft fly around 35,000 or 36,000 feet in the air. To put that in perspective, the peak of Mount Everest measures 29,029 feet.

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