How cold is it at 10,000 feet?

From sea level up to 36,000 feet msl, the temperature will likely decrease at a rate of 2° C or 3.5° F for every 1,000 feet gained. At 10,000 feet msl, there will be a standard temperature of -4.8° C or 23.3° F. Keep in mind at sea level, the standard temperature is 15° C or 59° F.



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From sea level up to 36,000 feet msl, the temperature will likely decrease at a rate of 2° C or 3.5° F for every 1,000 feet gained. At 10,000 feet msl, there will be a standard temperature of -4.8° C or 23.3° F. Keep in mind at sea level, the standard temperature is 15° C or 59° F.

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Between 9,000 and 12,000 metres (30,000 and 40,000 feet), the cruising altitude of most jet aircraft, air temperatures range from -40 to -70 °F (-40 to -57 °C).

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Airliners are built for cold temperatures (it's –57°C at cruising altitude) and aviators welcome the denser air that comes with extreme cold. Frigid air at –40°C is about one third more dense than hot air at +40°C.

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“Jet fuel begins to gel in extreme conditions and does eventually freeze, typically at minus 40 or so, although additives can be included that reduce that further,” says Haines. “Aircraft at cruising altitude will often experience temperatures of minus 50 to minus 70 F for hours on end.”

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The reason commercial airplanes fly at 30,000 to 36,000 feet is because it places them in a unique part of Earth's atmosphere known as the lower stratosphere. The lower stratosphere is above the clouds, so commercial airplanes are protected against bad weather.

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Planes have lower oxygen levels If this didn't happen, everyone inside the plane would die, as the low air pressure at the elevations planes fly (typically 35,000 feet or so) means there isn't enough oxygen present for your body to function.

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Using Pressure Equipment At sea level, the atmospheric pressure is 14.7 PSI. At 40,000 feet its only 2.72 PSI. If outside air gets into the mask and is breathed, it contains one-fifth (20 percent) of the oxygen necessary for survival at 40,000 feet.

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