Arizona's precipitation varies. At Flagstaff the annual average is 18.31 inches; Phoenix averages 7.64 inches; and Yuma's annual average is 3.27 inches.
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Arizona observes Mountain Standard Time on a year round basis. The one exception is the Navajo Nation, located in the northeast corner of the state, which observes the daylight savings time change.
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The Arizona tree frog is the state official amphibian. The frog is actually between three-quarter to two inches long.