What is the term for a region that consistently experiences a lot of sunshine?

The term that best describes a region that consistently experiences a lot of sunshine is "sunny." This word specifically indicates a weather condition characterized by a significant amount of sunlight, making it the most accurate choice in this context.

While "bright" might suggest light or clarity, it does not exclusively imply sunshine, as brightness can also come from artificial sources or reflectiveness. "Cheerful" conveys a positive emotion rather than a weather condition, making it unsuitable for describing a geographic area focused on its sunlight. "Warm" refers to temperature, which can occur without necessarily having a lot of sunshine; a warm region could be overcast or rainy while still maintaining higher temperatures. Therefore, "sunny" precisely captures the essence of a region known for its abundance of sunlight.