1. It was a summer afternoon. The clear blue sky was dotted with fluttering larks.

2. Summer is when the sun shines and the butterflies dance with the flowers.

3. In July, the sky is blue, the sun is like a fireball, and the clouds are like burning coals.

4. Early summer's sap flows invisibly around us, in weeds and herbs, in low shrubs and tall trees.

5. Summer is a pleasant season for all kinds of cold foods and juicy fruits.

6. In summer, it's hot, and sometimes it's rainy. People wear T-shirts, shorts, and sunglasses. Girls love to wear dresses and skirts.

7. Walking on the road, the wind coming like a heat wave attacks.

8. Summer is the second season in a year. It is between spring and autumn. The sun of summer is the hottest.

这些句子简洁明了，适合五年级学生理解和表达关于夏天的特点。