Over the coming weeks gasoline prices are expected to drift higher, as they do nearly every late winter and early spring when refiners close for maintenance and switch to more expensive summer blends.

NPR: Oil Prices Down Sharply For A 2nd Day

Not every spring day is going to be warm, and not every winter's day cold.

NPR: Not All Seasons Are Created Equal

These are the kinds of things that push gasoline prices higher every spring after what is normally a lull in gasoline prices in the late fall and early winter.

WSJ: Gasoline prices get early start on spring surge