How's the Weather?
Phoenix averages 325 sunny days and 7 inches of precipitation annually. The high mountains see about 25 inches of rain. The Grand Canyon is usually cool at the rim and about 20°F warmer on the floor. The North Rim is generally about 10°F cooler than the South Rim, which is open year-round. Temperatures in valley areas like Phoenix and Tucson average about 60°F to 70°F in the daytime in winter and between 100°F and 115°F in summer. Flagstaff and Sedona stay much cooler, dropping into the 30s and 40s in winter and leveling off at 80°F to 90°F in summer.