Gas prices climb to four month high

(CNN)– AAA says the national average for a gallon of regular gas climbed to $3.40 a gallon on Friday. That’s a four month high. Experts say there is no reason to panic about gas prices, at least not yet.

Gas prices always rise at this time of the year as the demand for fuel goes up once winter ends. It also means the end of a cheap winter fuel and the switch to the more expensive summer fuel blend.

That process is just getting started in most states. This year’s late winter jump in prices has been boosted by troubles at refineries with extreme cold in January knocking some refineries offline.