Gasoline prices are a little lower this week after 39 days of increases, though experts say they should rise again this spring.

The national average, which stayed at $3.758 per gallon on Friday, was down about a penny since Monday. Prices are still at the highest levels ever for this time of year.

Tom Kloza, chief analyst at the Oil Price Information Service, says prices dipped this week as suppliers conduct the equivalent of a spring clearance. They’re discounting winter gasoline blends to make room for different blends that are required for summer driving.

Meanwhile, benchmark oil prices rose by $1.42 to $108 per barrel in New York. Brent crude rose 46 cents to $125.90 per barrel in London.