Massachusetts gas prices are on the rise again. AAA Southern New England reports Monday that the average cost of a gallon of self-serve, regular jumped four cents in the past week to $3.80. Prices have now jumped 13 cents in the past month. Current prices are two cents per gallon below the national average and 15 cents more expensive than at the same time last year. AAA found selfserve, regular selling for as low as $3.69 per gallon and as high as $3.99.

[Via AP]