cold as the weather was,这句话是什么语法现象.具体分析

其实这句话可以这么说 as the weather was cold
as,though表示“虽然……但是”,“纵使……”之意.
as引导的让步状语从句必须以部分倒装的形式出现,被倒装的部分可以是表语、状语或动词原形,though也可用于这样的结构中,但although不可以这样用.例如：
Object as you may,I’ll go.(=Though/Although you may object,I’ll go.)
纵使你反对,我也要去.
Hard as/ though he works,he makes little progress.(=Though he works hard,he makes little progress.)
尽管他学习很努力,但几乎没取得什么进步.
Child as/though he was,he knew what was the right thing to do.（=Though he was a child,he knew what was the right thing to do.）
虽然他是一个孩子,但他知道该做什么.
Fast as you read,you can’t finish the book so soon.纵然你读得快,你也不能这么快读完这本书.
希望对你有所帮助……