What does the phrase "clouds in a clear sky" mean?

A sentence describing a sunny day with clouds in the sky can be:

"Today's weather is very good, there are clouds in the sky, the sun is shining and the temperature is suitable."

This sentence expresses today's weather, that is, it is sunny, that is, there are no meteorological conditions such as rain and smog, the sun is shining, the air contains a small amount of clouds, and the temperature is also very suitable. This kind of weather usually makes people feel comfortable and pleasant.