PHOENIX (AP) -- Gasoline prices at the pump around Arizona are lower again this week. Officials with Triple-A Arizona said Thursday that the average statewide price for unleaded regular gasoline is at $3.31 a gallon. That's almost 4 cents lower than last week. This week's national average is at $3.37 per gallon, down by nearly 6 cents from the previous week. Triple-A analysts say prices could continue to drop "barring unforeseen circumstances, such as hurricane activity." Glendale has the lowest average gasoline price in Arizona at $3.23 a gallon while Flagstaff has the highest at $3.54. South Carolina has the lowest average gas prices in the continental U.S. at $3.09 a gallon with California having the highest at $3.89 a gallon.