Temperatures decrease with increasing height as the ozone layer is left behind and the air thins out with increasing altitude. The lowest portion of the low-pressure mesosphere is heated by the warm air of the upper stratosphere. This heat radiates upward, getting less intense as altitude increases. Temperature decreases with height, reaching a minimum average value of -90 ºC at the top of the layer. The upper part of the mesosphere contains part of the ionosphere, an electrified region. The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet. Temperature decreases with height throughout the mesosphere. The coldest temperatures in Earth's atmosphere, about -90° C (-130° F), are found near the top of this layer. Because of this absorption, the temperature increases with height. From as low as -184 °F (-120 °C) at the bottom of this layer, temperatures can reach as high as 3,600°F (2,000°C) near the top.The intense energy from the Sun during the day causes a reaction of the nitrogen and oxygen atoms. This reaction is when those atoms lose an electron or two and become ionized. When this photoionization occurs, temperature of the Ionosphere increases with the activity of electrically charged particles.

As the altitude increases, the air temperature decreases. The Mesosphere, like the troposphere layer, has a decrease in temperature with altitude because of the decreases in the density of the air molecules. Thermosphere: As the altitude increases, the air temperature increases. Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature decreases as you gain altitude in the troposphere and mesosphere. The mesosphere decreases in temperature with altitude. The mesosphere ranges in temperatures from -2.5 to -90 degrees Celsius. The reason the temperature decreases with altitude is because the Earth's surface is a source of heat; heat from its geothermal gradient, and absorbed solar radiation that is reemitted. Thermospheric temperatures increase with altitude as a result of the absorption of highly energetic solar radiation by the small amount of residual oxygen present. Temperatures in the thermosphere are highly dependent on solar activity. The temperature in the thermosphere generally increases with altitude reaching 600 to 3000 F (600-2000 K) depending on solar activity. This increase in temperature is due to the absorption of intense solar radiation by the limited amount of remaining molecular oxygen. Most of the ionosphere is to be found in the outer reaches of the atmosphere, the thermosphere, where the neutral temperature increases with altitude from a minimum of 160–190 K near the mesopause, which is at about 85 km in the terrestrial atmosphere. Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature decreases as you gain altitude in the troposphere and mesosphere. The thermosphere is the Earth's atmosphere layer directly above the mesosphere and below the exosphere. The temperature increases with altitude rapidly in this layer due to the absorption of vast amounts of heat from the sunlight. Within the mesosphere, temperature decreases with increasing height, due to decreasing absorption of solar radiation by the rarefied atmosphere and increasing cooling by CO2 radiative emission. The top of the mesosphere, called the mesopause, is the coldest part of Earth's atmosphere.