On Monday, the average price of a gallon of self-serve regular gasoline in the Inland Empire rose to its highest amount since Oct. 5, increasing seven-tenths of a cent to $3.847.

The average price in Riverside and San Bernardino counties has risen 20 of the past 21 days and is 8.7 cents more than one week ago and 23.9 cents higher than one month ago, but 43.8 cents less than one year ago, according to figures from the AAA and Oil Price Information Service.

The average price has risen 24.8 cents over the past 21 days, including 1.1 cents on Sunday.

The rising prices are the result of the annual refinery maintenance season when supplies of winter blend gasoline drop as refineries start production of the more expensive summer blend, according to the Automobile Club of Southern California.

Gas prices around the world

POSTED: 07:34 AM PDT Mar 11, 2013 

U.S. gas prices are nothing compared to many countries around the world.

Man at gas pump
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Carlos Barria/Reuters

While U.S. gas prices leave many Americans shaking their fists at the pump, they're nothing compared to gas prices in most countries around the world. Take a look at the average gas prices in 11 countries as of mid-March.