South Dakota's gas prices rose over the past week, but still remain significantly cheaper than last summer.
The state's average price per gallon rose by three cents this week to $3.39, according to the latest GasBuddy report. That's still nearly a nickel cheaper than last month and more than 80 cents lower than this time last year.
South Dakota's changes reflect nationwide trends.
"Gasoline prices have drifted higher in the last week due to some relatively minor refinery kinks and low gasoline supply, but it may not be a trend that lasts too much longer," said Patrick De Haan, head of petroleum analysis at GasBuddy. "As we unofficially start the summer driving season, the national average is likely to spend much of the summer in the range of $3.35-$3.85 per gallon, though it could go higher if unexpected refinery outages flare up, or we see a major hurricane or economic development."