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USA: Annual Average Precipitation

Rain and snow are vital components in the planet's water cycle, critical to all life on Earth. 
Participation in the United States varies significantly across the country. Late summer and fall tropical cyclones bring precipitation that comes across the Gulf and Atlantic states. During the winter and spring, Pacific storm systems get Hawaii and the western United States most of their rain. Low-pressure systems going up the East shoreline bring cold season precipitation to the Mid-West and Northeast U.S. states and the Great Salt Lake and the Finger Lakes region.
The conterminous United States gets enough precipitation throughout an average year to cover the States to a depth of about 30 inches. It is equal to about 1,430 cubic miles of water every year. 
USA: Annual Average Precipitation

Top 10 U.S. wettest cities (Average annual precipitation in inches)
1. Hilo (Hawaii) - 128.00
2. Quillayute (Washington) - 104.50
3. Astoria (Oregon) - 69.60
4. Blue Canyon (California) - 67.87
5. Mobile (Alabama) - 64.64
6. Tallahassee (Florida) - 64.59
7. Pensacola (Florida) - 61.16
8. New Orleans (Louisiana) - 50.72
9. W Palm Beach (Florida) - 59.72
10. Miami (Florida) - 59.55

Below the map of precipitation potential in every U.S. county created by the Biota of North America Program (BONAP).

Precipitation potential in every U.S. county

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