Gas prices in Massachusetts are continuing their month-long rise.
AAA Southern New England reported Monday that a gallon of self-serve, regular is now selling for an average of $3.40, up three cents from a week ago.
The price per gallon has now risen 19 cents in the last four weeks.
The Massachusetts price is two cents above the national average of $3.38. A year ago, the average price in Massachusetts was $3.09.
AAA said its survey found prices ranging from a low of $3.22 per gallon, to a high of $3.89.