Gasoline prices continued their decline this week, just in time for Independence Day road travel, according to the AAA Fuel Gauge Report.

Arizona's average for regular unleaded was reported on Monday to be $3.42 a gallon. Tucson reported the state's lowest average, at $3.34, while Flagstaff was highest at $3.63.

Phoenix stations were selling regular unleaded for an average of $3.37 a gallon. Nationally, prices were $3.33.

All averages were down several cents from one week ago, and 25 to 30 cents lower than one month ago. Current prices have in most cases fallen close to the averages marked one year ago.

In July 2011, Tucson's average price was $3.30 a gallon, and the statewide average was $3.42.

Gasoline prices in the United States usually rise at this time of year because of summer vacation travel.

AAA and others say prices are down because global oil prices have stabilized and even declined as crisis situations in oil-producing regions have cooled down.