Rick Bowmer, Associated Press
Gas prices are displayed at a gas station, Monday, May 14, 2012, in Portland, Ore. Motorists across most of the country have been getting a break on gas prices, but not on the West Coast. The average price for a gallon of regular gasoline in Oregon is $4.17.

While gas prices across the nation have been on the decline for about a month, there is one exception: the West Coast.

The entire coast has experienced a jump of 12 cents per gallon in the last week, according to Consumer Reports.

The average per-gallon increase in California was 14 cents in just the last week, according to GasBuddy. Gas prices have risen by 17 cents in Orange County and Santa Barbara. Washington state has also seen an increase of 14 cents per gallon over the last week. Oregon has been hit the hardest, as gas prices have jumped by 17 cents there in the last week.

Elsewhere, prices dropped by as much as 14 cents in some states in just the last week, according to Time.

As of Tuesday, the national average was $3.72, that's about 4 cents lower than just a week earlier and 17 cents less than the prior month, according to AAA's Fuel Gauge Report.