"The sunniest city in the United States is Yuma, Arizona, which receives 90% of possible sunshine.
The next 4 sunny cities are: Redding, Calif.; Flagstaff; Phoenix; and Las Vegas.
The cloudiest city is Juneau, Alaska, which receives only 30% of the annual possible sunshine. Other cloudy cities are Quillayute, Washington; Elkins, West Virginia; Hilo, Hawaii; and Anchorage."
http://www.usatoday.com/weather/reso...r-extremes.htm