Do you need to have 3.5 plus GPA every year graduate with honors?

No, you don't need a 3.5 GPA *every year* to graduate with honors. Most universities calculate your GPA cumulatively over your entire undergraduate career. They then set a minimum cumulative GPA threshold for graduating with honors (e.g., 3.5, 3.7, 3.9, etc.), and you must meet that threshold at the time of graduation to receive honors.