AUGUSTA — The average retail cost of a gallon of gas has gone up a little over a penny over the past week.

Price-monitoring website MaineGasPrices.com reports Monday that the price is averaging $3.47 a gallon.

In-state prices remain 23 cents above the national per-gallon average of $3.24.

Maine prices are 9.2 cents per gallon higher than a month ago and 5.9 cents per gallon lower than at this time last year.

The price is based on a survey of more than 1,200 Maine gas stations.