If you're looking for most sunshine possible, Yuma is your best option. If you're looking for a place with pleasant summers and don't mind cooler winters, Flagstaff is perfect. For a place in between, consider Prescott (it has hotter summers than Flagstaff but also warmer winters with the highest temperature possibly climbing to 65 °F). If you're looking for Arizona cities with 4 seasons, one of the most popular places is Flagstaff with very distinct four seasons.