On average, temperature increases from the surface to the tropopause (around 10 km, then decreases to the stratopause (around 50 km), then decreases to the mesopause (around 90 km), then increases through the thermosphere.

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Temperature decreases from the surface to the tropopause, then increases to the stratopause, decreases again to the mesopause, and finally increases through the thermosphere.

On Average, Temperature Increases from the Surface to the Tropopause