summer需要加冠词the吗

前边可以加冠词，也可以不加，例如：

1、I haven't seen him since the summer before last.我已有两个夏天没见过他了。

2、Each summer a new batch of students tries to find work.每年夏天都有一批新的学生要找工作。

3、I made painting the house my project for the summer.把房子粉刷了一遍，这就是我的夏季工程。