What idioms are there to describe "the sky is especially blue and bright without a trace of white clouds"?

There are no clouds in the sky. The sky is blue, without a cloud. Describe sunny weather.

Clear sky Wan Li [qí ng k not ng wà n lǐ] Clear sky Wan Li. Describe the sky as clear and cloudless.

Blue sky: a light blue sky. The blue sky is as clear as washing. Describe sunny weather.

The sun is shining high [yàn yáng gāo zhào ao] The sun is shining high on the earth, describing the sunny weather. When describing people or things, it indicates a bright future and presents a good situation.

Clear skies in Wan Li describe the sky as clear and cloudless.