关于such\so的问题The weather was so cold that I didn’t like to le

关于such\so的问题The weather was so cold that I didn’t like to leave my room
The weather was ____ cold that I didn’t like to leave my room
为什么要填so?不是such修饰名词so修饰形容词吗?
weather是名词为什么不填such?
谢谢!