Arizona motorists are paying more at the pump again this week.

The average statewide price for regular gasoline is $3.62 a gallon, AAA Arizona said Thursday. That's more than 13 cents higher than last week and a rise of 52 cents over the past month.

Tucson has the lowest average gasoline price in Arizona at $3.37 a gallon - up 11 cents per gallon since last week.

This week's national average is $3.77 per gallon, up 15 cents from last week.

AAA analysts say the price rise has been propelled since mid-January by regional refinery issues and the approaching switchover to summer-blend gasoline.