Arizona Weather in December
December in Arizona feels calm, refreshing, and bright. The desert air turns crisp, the skies stay clear, and the winter sun brings a soft golden glow to everything from saguaro-studded landscapes to red rock formations. It’s one of the most comfortable months to explore the state, and understanding the weather helps you plan your days with ease. December brings cool mornings, warm afternoons, and chilly evenings. The sun is steady and pleasant, but temperatures can shift quickly because of Arizona’s dry air. You may start your day with a jacket, enjoy warm sunshine at midday, and reach for layers again by sunset.
Overall, expect Dry air, Low humidity, Cool breezes, Bright sun, and Noticeable temperature swings. These patterns make December ideal for hiking, sightseeing, and enjoying outdoor events without the intense heat of Arizona’s warmer seasons.
Average December Temperatures Across the State
Arizona’s weather changes dramatically by region. Here’s a quick, useful breakdown:
Phoenix & Scottsdale (Low Desert)
Highs: 65–70°F
Lows: 40–45°F
Warm afternoons, cool nights, and sunny skies almost every day. Perfect for outdoor dining, hikes, and golf.
Tucson (Southern Desert)
Highs: 68–72°F
Lows: 40–44°F
A touch warmer than Phoenix, with the same dry, sunny winter feel.
Sedona (High Desert)
Highs: 55–60°F
Lows: 35–40°F
Crisp mornings, gorgeous red rock views, and chilly nights. Great for day hikes and spa retreats.
Flagstaff & Northern Arizona (Mountain Region)
Highs: 35–45°F
Lows: 15–25°FExpect true winter snow, frost, icy mornings, and a strong chill after sundown.
