Yes, air temperature normally decreases with an increase in altitude through the troposphere. Air temperature normally decreases with height above the earth’s surface because the primary source of heating for the air is the Earth. The rate of change in temperature with altitude is called the environmental lapse rate of temperature (ELR) The ELR varies from day-to-day at a place, and from place to place on any given day. The normal lapse rate of temperature is the average value of the ELR, .65o C /100 meters. That is, at any particular place and on any given day the actual ELR may be larger or smaller, but on average has a value of .65o C /100 m.
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