A four-word idiom indicating that the weather is fine

Wan Li is cloudless,

Spring blossoms,

Autumn is crisp,

The blue sky is like washing,

The sky is high and the clouds are light.

Blue sky Wan Li,

The clouds are light and the wind is light,

Spring is full,

Rainbow sells rain Ji,

Hui feng and Chang,

The sky is clear and the air is fresh.