如果你想表达天气太冷了，你可以说:

It's too cold outside.
The weather is freezing.
I can't stand the cold.

你也可以用更具体的词来形容天气:

It's below freezing out there.
The temperature has dropped to single digits.
It's a polar vortex outside.

你还可以用一些修饰词来描述天气:

It's bitter cold outside.
The air is icy.
It's a frosty day.