Gas prices around the country will slightly increase ahead of Memorial Day weekend, the unofficial kickoff to the summer season.

The national average for a gallon of regular gasoline is now $3.192, according to AAA. This figure is up $0.04 from last week and $0.02 from last month.

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This figure is still down from last year, when the national average heading into Memorial Day weekend stood at $3.60.

Gas prices typically increase at the end of spring. As more people hit the road during the summer, demand rises and so do prices. AAA predicts that a record-breaking 39.4 million people across the U.S. will hit the road this weekend.

“Nationwide, a surge in gas demand coupled with the climbing cost of crude oil has pushed prices higher at the pumps,” said Montrae Waiters, AAA-The Auto Club Group spokeswoman. “The slump in crude oil costs kept the customary surge in spring gas prices at bay, but now, we find ourselves amid this anticipated increase as the Memorial Day weekend approaches.”

Data from the Energy Information Administration (EIA) found that gasoline demand increased last week from 8.71 million barrels per day to 8.79 million. At the same time, the total gasoline supply in the U.S. dropped slightly, from 225.7 million barrels to 224.7 million.

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The most expensive states for regular unleaded gas are California, with a $4.92 average price per gallon, Hawaii with a $4.49 average price per gallon, and Washington with $4.33 average price per gallon. 

The cheapest states for regular unleaded gas are Mississippi with a $2.66 average price per gallon, Tennessee with a $2.71 average price per gallon, and Louisiana with a $2.73 average price per gallon.