Temperature Differentials by Altitude
Air Temperatures drop by an average of 3.6 F degrees per 1000 feet (or 6.5 C degrees per 1000 meters) up to the top of the troposphere at 33,000 feet (10,000 meters). After that altitude (in the stratosphere), temperatures begin to slowly rise until the mesosphere is reached (165,000 feet or 50,000 meters)
Example: If the temperature is 76 degrees at ground level, it will be 58 degrees at 5,000 feet, 40 degrees at 10,000 feet and 22 degrees at 15,000 feet, 4 degrees at 20,000 feet, -14 degrees at 25,000 feet, and -32 at 30,000 feet.
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