Sunniest City in the U.S.: Yuma, Arizona

Yuma, Arizona holds the official title of "Sunniest City in the United States" (and often the world) based on National Weather Service data.

The Numbers

• Annual sunshine: ~4,015 hours (91% of possible)
• Sunny days: Average 320+ per year
• Clear days: ~242 (cloud cover <30%)
• Rainfall: ~3 inches (76 mm) annually—one of driest U.S. cities

Why Yuma?

• Location: Sonoran Desert, near Mexico/California borders
• Subtropical high pressure → sinking air, cloud suppression
• Rain shadow from coastal ranges
• Stable air mass, minimal frontal activity

Other Contenders

• Phoenix, AZ: 3,872 hrs sun, 299 sunny days
• Las Vegas, NV: 3,825 hrs, 294 sunny days
• El Paso, TX: 3,763 hrs, 290 sunny days
• Redding, CA: 3,600+ hrs (northern surprise)

Global Context

Yuma rivals Aswan, Egypt and Yuma's sister city in sunshine records. It's a climatic outlier even in the Desert Southwest.

Implications

• Solar energy potential: among highest in U.S.
• Agriculture: Year-round growing (winter lettuce capital)
• Tourism: Winter sun seekers, snowbirds
• Health: Vitamin D abundance; heat risk in summer (100°F+ common)
• Military: Yuma Proving Ground, MCAS Yuma—ideal testing climate

If you want guaranteed sun, Yuma delivers—just bring water and sunscreen.