老师，您好！我最近在刷高考真题，下面一句是 2017 年高考英语北京高考题的一轮听力对话：

W: What was the weather like yesterday?

M: It was changing all the time!

W: How was that?

M: Uh, it started out warm and sunny, but when I went into the mountains and climbed higher, it started snowy. Then, when I came back, a strong warm wind began to blow.

不太明白这里的 snowy 是什么用法？形容词作状语？