degrees of frost 主要用于英式英语中，在意义上相当于 degrees below freezing point，即指冰点以下的温度，所以 ten degrees of frost = ten degrees below zero，意思是“零下10度”。

Ten degrees of frost had frozen the lock on the car.

意思是：零下10度的气温把汽车上的锁都给冻住了。

另举两例用法如下：

There were ten degrees of frost last night. 昨晚零下10 度。

We had 11 degrees of frost last night. 昨天夜里气温降到了零下 11 度。