Tiānqì yuèláiyuè lěng le!

天气越来越冷了！

The weather is getting colder and colder!

Notes:

天气(tiānqì): weather

越来越(yuèláiyuè): get more and more

冷(lěng): cold

了(le): particle word which means something are changing.

 

Example:

A：天气越来越冷了。

     Tiānqì yuèláiyuè lěng le! 

     The weather is getting colder and colder!

B：是啊。

     Shì ā.

     You're right.