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How does temperature change with altitude?
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At higher altitudes, the temperature usually decreases with an average decrease of approximately 6.5 degrees Celsius for every 1,000 meters. This phenomenon is known as the lapse rate and is due to the decrease in air pressure with altitude. The lower air pressure results in lower temperatures. However, the exact rate of decrease can vary greatly and can even be reversed in certain weather conditions, such as adiabatic lapse rate.