4 sentences

1. 该地区的年均降雨量非常稳定。

   gāi dì​qū de nián​jūn jiàng​yǔ​liàng fēi​cháng wěn​dìng.

   The average annual rainfall in this region is very stable.

   Source: Dong Chinese Dictionary

2. 该地区的降雨量全年分布均匀。

   gāi dì​qū de jiàng​yǔ​liàng quán​nián fēn​bù jūn​yún.

   Rainfall in this region is distributed evenly throughout the year.

   Source: Dong Chinese Dictionary

3. 今年四月的降雨量比往年都要多。

   jīn​nián Sì​yuè de jiàng​yǔ​liàng bǐ wǎng​nián dōu yào duō.

   The rainfall this April is higher than in previous years.

   Source: Dong Chinese Dictionary

4. 部分地区日降雨量已超过100毫米。

   bù​fen dì​qū rì jiàng​yǔ​liàng yǐ chāo​guò100 háo​mǐ.

   The daily rainfall in some areas has exceeded 100 mm.

   Source: OpenSubtitles