Why are there few or no clouds in the stratosphere?
The stratosphere (STRAT uh sfihr) lies above the troposphere. It extends from about 11km to 50km above the earth. In the lower part of the stratosphere, the temperature does not change with height. But, in the upper part , temperature increases with height. At 50km, the temperature is about 7o/c.
Air in the stratosphere is dry and thin, and there are very few or no clouds.