It is warm. What is the idiom of.

The clouds are light and the wind is light [explanation]. It describes sunny weather. Also known as "the wind is light and the clouds are light."

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

Blue sky: refers to a large area and a long distance. It describes sunny weather.

Clear skies Wan Li clear skies: clear skies Wan Li. It describes a clear sky without any clouds. The moon is bright and the wind is clear.