Question

temperature decreases with increasing altitude why

Answer 1

As you increase in elevation, there is less air above you thus the pressure decreases. As the pressure decreases, air molecules spread out further (i.e. air expands) and the temperature decreases. If the humidity is at 100 percent (because it's snowing), the temperature decreases more slowly with height.

Answer 2

In low altitude more land is there as compared to higher altitude so more UV rays are absorbed at low altitude making it warmer than higher altitude.So, temperature decreases with increase in altitude