Summer Break, Summer Holiday
You know that 夏 means summer and 休 means rest. What is a "summer rest" though? It's a summer break or summer vacation.
The readings are kun'yomi readings because this word is essentially two separate words put together into one word. You should know the reading for 夏 from the kanji and the reading for 休み from the vocab.
July and August are summer vacation.
I played games a lot during summer vacation.
During the summer vacation, I go to my grandmother's house in Shikoku every year.