The average price of a gallon of self-serve regular gasoline in Los Angeles County rose 1.1 cent Monday to $4.017, while the Orange County average surpassed the $4 mark for the first time since Nov. 3, increasing 1.1 cents to $4.002.
The Los Angeles County average price is the highest it has been since Nov. 5 after rising on 32 of the past 34 days and 36 of the past 39, including 2.8 cents on Sunday, when it broke the $4 mark for the first time since Nov. 6, according to figures from the AAA and Oil Price Information Service.
The average price is 24.8 cents more than one week ago, 37.5 cents higher than one month ago and 21.3 cents greater than one year ago.
Los Angeles County now has the state's highest average and is one of three regions where the average for self-serve regular is above $4. The lowest average price is $3.723 in Modesto.
The Orange County average price is 26.1 cents more than one week ago, 37.7 cents higher than one month ago and 21 cents greater than one year ago. It has risen 37 times in the past 42 days, increasing 45.1 cents over that span, including 2.8 cents on Sunday.
The increasing prices are the result of higher oil prices, Middle East tensions, maintenance issues at refineries and investors shifting their money into the gasoline market "earlier and earlier," according to Jeffrey Spring of the Automobile Club of Southern California.