TULSA, Oklahoma - Gas prices rose about ten cents a gallon in the Tulsa area over the last day.

According to AAA, the national average price is $2.25 a gallon. In Tulsa the price is now at about 1.89 a gallon.

That's still eight cents lower than a month ago. 

Experts say prices could rise as the U.S. works on a trade deal with China and refineries switch over to more expensive summer blends.