It's getting colder.

天要冷了。

The wind is picking up.

要刮风了。

It's freezing / chilly out there.

外面冻死了。

The wind really chills me to the bone. / The wind is bone-chilling.

这寒风真是刺骨。

I'm frozen stiff.

我简直冻僵了。

Bundle up, it's chilly outside！

多穿点穿厚点，外面很冷！