Does the atmosphere get colder or warmer when you increase in height?

The atmosphere generally gets colder with an increase in height in the troposphere, which is the lowest layer of the atmosphere where weather occurs. This decrease in temperature, known as the lapse rate, averages about 6.5 degrees Celsius per kilometer. However, in the stratosphere, which lies above the troposphere, the temperature actually increases with height due to the absorption of ultraviolet radiation by the ozone layer.