Gasoline prices this Memorial Day holiday weekend will be at their lowest level in three years around Arizona.

Officials with AAA Arizona said Thursday that the average statewide price for unleaded regular gasoline is $3.45 a gallon. That's up by less than a penny from last week.

This week's national average is $3.65 per gallon, an increase of nearly 6 cents from last week.

Tucson has the lowest average gasoline price in Arizona at $3.18 a gallon while Flagstaff has the highest at $3.67.

South Carolina has the lowest average gas prices in the continental U.S. at $3.24 a gallon with North Dakota having the highest at $4.23 a gallon.