Number + 月
月 (yuè) is a noun meaning "month" or "moon." When used with numbers, it indicates a specific month of the year. For example, 三月 means "March" (the third month).
我的生日在六月。
Wǒ de shēngrì zài liù yuè.
My birthday is in June.
他们打算下个月搬家。
Tāmen dǎsuàn xià gè yuè bānjiā.
They plan to move next month.
一月和二月是一年中最冷的月份。
Yī yuè hé èr yuè shì yī nián zhōng zuì lěng de yuèfèn.
January and February are the coldest months of the year.