Last Month
noun
The previous month is last month.
This is a jukugo word, which usually means on'yomi readings from the kanji. 月 has two on'yomi readings, but since this is NOT a specific month name, it's going to use the げつ reading. Here's a mnemonic to help you remember that:
Since last month, your centaur gets (せんげつ) up every night and comes to sleep in your bed. He's been having really bad nightmares since last month, but… why? Did something traumatic happen to your centaur last month? Try to remember.
先月は六月でした。
Last month was June.
先月の分は一万円です。
Last month's portion was 10,000 yen.
先月、ニューヨークでおあいしましたよね？
We met in New York last month, right?