3 sentences

1. 窗外阴雨绵绵，已经下了一整天。

   chuāng wài yīn​yǔ mián​mián, yǐ​jīng xià le yī zhěng​tiān.

   It has been drizzling outside all day long.

   Source: Dong Chinese Dictionary

2. 这种阴雨天气已经持续一周了。

   zhè zhǒng yīn​yǔ tiān​qì yǐ​jīng chí​xù yī zhōu le.

   This gloomy, rainy weather has lasted for a week.

   Source: Dong Chinese Dictionary

3. 连日的阴雨让水池里的水都积满了。

   lián​rì de yīn​yǔ ràng shuǐ​chí lǐ de shuǐ dōu jī mǎn le.

   The continuous rain has filled the pool to the brim.

   Source: Dong Chinese Dictionary