Phoenix is the sixth largest city in the United States and has pleasant, wide-open spaces with cacti, rust-colored mountains, larger-than-life sunsets and stars that you can just about reach out and touch. This desert city has an average of 325 sunny days per year and is a popular destination for winter vacations and as a second home. Tucson is the second-largest city in Arizona. The city has pleasantly cooler temperature than Phoenix and is located in the Sonoran Desert. Tucson is one of the "forty fastest growing metropolitan areas" of the United States. With a population of one million in the metropolitan area, the city is the 51st largest city in the country.