PORTLAND — A price monitoring website says average retail gasoline prices in Maine have risen 1.6 cents per gallon in the past week, to $3.97 per gallon.

MaineGasPrices.com says Sunday’s average price was $1.04 per gallon higher than it was on the same day one year ago, and 21.4 cents per gallon higher than it was a month ago.

Sunday’s price in Maine compares with the national average, which has fallen 0.8 cent per gallon in the last week to $3.93 per gallon.