3 sentences

1. 上个月是十一月吗？

   shàng gè yuè shì Shí​yī​yuè ma?

   Was last month November?

   Source: Tatoeba

2. 十一月的天气开始变冷了。

   Shí​yī​yuè de tiān​qì kāi​shǐ biàn lěng le.

   The weather starts to get cold in November.

   Source: Dong Chinese Dictionary

3. 农历十一月通常被称为冬月。

   nóng​lì Shí​yī​yuè tōng​cháng bèi chēng​wéi Dōng​yuè.

   The eleventh month of the lunar calendar is usually called the 'Winter Month'.

   Source: Dong Chinese Dictionary