Usage: predicate.
Near synonyms: sky high and fresh, sky high and clear.
Antonyms: spring rain, fall rain.
Sentence-making:
1. On a clear autumn day, my classmates and I went on a field trip.
2. In the season of high and clear autumn with pleasant scenery and light winds, the geese, in large flocks, began the great migration of the race for the reproduction of their offspring.