The rainy season in the Andes normally starts in December.

安第斯山脉的雨季一般从12月开始。

The rainy season has ended.

雨季结束了。

Summer is a rainy season in China.

在中国，夏天是一个多雨的季节。

The rainy season begins.

雨季开始了。

The most pleasant thing of the rainy season is that one can be entirely free from dust.

雨季最令人愉快的事情是完全没有了灰尘。