LOS ANGELES (CNS) - The average price of a gallon of self-serve regular gasoline in Los Angeles County rose today for the 31st consecutive day, increasing nine-tenths of a cent to $3.513, its highest amount since Oct. 21.

The average price has increased $1.024 during the streak, including 3.1 cents on Sunday, according to figures from the AAA and Oil Price Information Service.

The average price is 44.6 cents more than one week ago and $1.033 higher than one month ago, but 42.1 cents less than one year ago thanks to 24 decreases in the 25 days immediately before the current string of increases began.

The streak of increases is the longest since a 36-day streak from Feb. 9-March 16, 2011.

The Orange County average price also rose for the 31st consecutive day, increasing three-tenths of a cent to $3.492, its highest amount since Oct. 21.

The Orange County average price has increased $1.06 during the streak, including 2.8 cents on Sunday.

The Orange County average price is 43.3 cents higher than one week ago and $1.036 more than one month ago. However, it is 43.9 cents lower than one year ago thanks to 23 decreases in 24 days immediately before the current string of increases began.

The streak of increases is the longest since a 32-day streak from Feb. 6-March 9, 2014.

The increasing prices are the result of reduced supply, stemming from the customary first-quarter refinery maintenance connected with the switch to production of summer blend gasoline, combined with outages at several refineries and a strike by refinery workers represented by United Steelworkers.