perioval precipitation rate

例句：

1. 1. The city's annual rainfall rate is 200 mm.
   该城市的年降水量是200毫米。
2. 2.The rainy season in this region usually lasts from June to September.
   该地区的雨季通常从六月持续到九月。
3. 3.The scientists analyzed the data to determine the seasonal variations in the precipitation rate.
   科学家们分析了数据，以确定降水率的季节变化。