Why temperature is low at height (@ Mount Everest)?

Question

Temperature is low @ hilly area and high in cities. Even Sun is comparatively near at height then land. So temperature must be high on Mountain. (:

Answer 1

On Earth, heat travels by radiation, convection, and conduction.

On Earth on a sunny day, the heat radiating from the Sun warms the molecules of the atmosphere, and they warm other molecules and they warm others in turn. That conduction is what keeps the Earth warm at night when we aren't receiving direct Sun rays. It also means that even when we are standing in shadow, the air around us has some warmth. On Earth, heat also travels in large density-driven convection loops that spread out the warmth.

At height Air has low pressure so temprature is LOW.

Answer 2

The reason the locations near sea-level are almost always warmer is because of the heat radiating from the surface of the earth.  Also, air is thin at higher altitude, and doesn't hold heat as efficiently.

Answer 3

When you take a certain volume of air and spread it out (lower its pressure) it gets colder, and vice versa. At the top of mount Everest, the temperature is very cold because the air is at lower pressure. The land at sea level is warmer because it is at higher pressure.

The distance between Mt Everest and the sun is only a very tiny bit less than the distance from the Sun to the ground when compared with how far the sunlight travels before it gets to Earth (~93 million miles). That makes the temperature increase insignificant.