降雨量

• 阝(mound; hill)RADICAL
• 夅(descend; go down)PHONETIC

Going down from a high hill peak is the meaning of the character 降.

• 雨(rain (pictographic))ASSOCIATIVE

The character 雨 depicts drops of water falling from the sky, symbolizing rain.

• 旦(dawn; daybreak)PHONETIC
• 里(village; mile (unit of measurement))RADICAL

Measure each mile of the road right from dawn's first light.