Arizona

Arizona in December brings cool mornings, sunny afternoons, and crisp desert nights that feel calm and refreshing. Clear skies and low humidity create comfortable days for hiking, exploring, and holiday events. The weather shifts fast with Arizona’s dry air, so you may start with a jacket, enjoy warm sunshine by midday, and reach for layers again after sunset. Southern cities stay mild, while northern towns like Flagstaff see real winter snow. You’ll enjoy golden light, steady sun, and bright, stargazing-friendly evenings that make December one of the best months to experience Arizona’s trails, towns, and scenic drives.