降水

1. Origins, structure, and basic meaning

• Structure: 降水, read こうすい, means precipitation, including rain, snow, and other atmospheric water falling to the ground.
• Basic usage: Its geographic distribution may be charted, or amounts on opposite sides of a mountain may be color-coded.

2. Common pitfalls and similar expressions

• Precipitation and its measured amount
  • This is the weather element whose distribution is charted, while the compound in the second example refers specifically to the amount falling on each side of a mountain.