Planning a trip to the Valley of the Sun during the final month of the year requires a complete shift from how you think about winter. While much of North America buries itself in snow and sub-zero temperatures, Phoenix trades blizzards for bright blue skies and remarkably comfortable days.
December in Phoenix brings average daytime highs of 66°F (19°C) and average nighttime lows of 45°F (7°C). It is the coolest and cloudiest month of the year for the local desert climate, yet it still boasts an average of nearly eight hours of sunshine daily and minimal rainfall. You won't need heavy parkas or snow boots, but the desert air undergoes a dramatic temperature swing the moment the sun dips below the horizon.
Decoding Monthly Climate Patterns and Temperatures
Understanding how the thermometer behaves throughout a December day helps you pack right and plan your schedule. The month begins slightly warmer with typical highs nudging 70°F (21°C), while late December marks the chilliest stretch of the season. During the final week, daily highs hover around 65°F (18°C) and lows regularly drop into the mid-40s.
Morning air can feel quite brisk when you step outside before 9:00 AM. Temperatures often sit in the upper 40s during these early hours, prompting locals to pull on light jackets or sweaters. By 2:00 PM, direct sunlight warms the atmosphere into the upper 60s, creating an ideal climate for outdoor exploration without the exhausting, oppressive heat of the summer months. More journalism by AFAR highlights comparable perspectives on this issue.
- Average Daily High: 66°F (19°C)
- Average Daily Low: 45°F (7°C)
- Average Monthly Rainfall: 0.7 to 1.1 inches across roughly 2 to 4 wet days
- Average Sunshine: ~77% of possible daylight hours
Rain is rare, but December is statistically the month most likely to deliver a rare heavy downpour or isolated thunderstorm. Bring a light rain shell just in case, though your odds of encountering an unblemished stretch of sunny days remain exceptionally high according to historical climate data maintained by the National Centers for Environmental Information.
How to Dress for the Desert Thermal Swing
The single biggest mistake visitors make is assuming that Arizona stays hot 24 hours a day. When locals talk about winter feeling cold, they aren't exaggerating about the mornings and nights—they're experiencing a dry desert chill that cuts through thin fabrics.
Mastering the art of layering ensures you stay comfortable from sunrise hike to evening dinner.
- Base layers for the afternoon: Pack lightweight t-shirts, short-sleeve blouses, or breathable athletic tops for the peak warmth of midday.
- Mid-layers for the morning: Bring cardigans, hoodies, fleece jackets, or flannel shirts that you can peel off as the temperature climbs between 10:00 AM and noon.
- Outer shell for the night: A packable down jacket, denim jacket, or windbreaker is mandatory once the sun sets and temperatures tumble back into the 40s.
- Footwear: Sturdy trail runners or hiking boots are essential if you plan to hit the local paths. Casual sneakers or boots work well for urban exploring and dining out.
Don't forget to pack sunglasses and broad-spectrum sunscreen. The winter sun in Arizona remains intense, and UV protection is just as vital in December as it is in June.
Best Activities for Mild Winter Weather
Because the oppressive heat breaks, December is peak season for outdoor recreation in the Valley of the Sun. You can spend all day outside without overheating.
- Hiking the Sonoran Desert: Trails at Camelback Mountain, Piestewa Peak, and Papago Park offer stunning views in comfortable weather. Start your hikes mid-morning after the initial chill burns off.
- Exploring Desert Botanical Gardens: Discover thousands of species of desert flora without sweating through your clothes.
- Catching Holiday Light Displays: Local spots like the Desert Botanical Garden host evening light shows where a light jacket or fleece is completely necessary.
- Golfing: Phoenix boasts dozens of world-class courses that experience heavy play during December due to the optimal mid-60s temperatures.
For more details on regional events, local festivals, and seasonal travel guidelines, check the official tourism portal at Visit Phoenix.
Common Mistakes to Avoid
Travelers frequently stumble on a few predictable pitfalls when visiting Phoenix in December. Keeping these missteps in mind saves you time and discomfort.
- Packing only summer clothes: Assuming shorts and tank tops will suffice all day leaves you shivering during early morning tours or dinners al fresco.
- Skipping hydration: Because the air is cooler and humidity drops, you won't feel yourself sweating as much on hikes. Dehydration happens quickly in the dry desert air, so carry a reusable water bottle everywhere.
- Forgetting pool reservations: Many resort pools are heated during winter, but budget motels may leave theirs ice-cold. Verify pool temperatures before booking if swimming is on your itinerary.
- Underestimating daylight hours: Winter days are short, with sunset arriving around 5:30 PM. Plan your outdoor adventures for the morning and early afternoon.
Frequently Asked Questions
Can you swim in Phoenix hotel pools in December?
Yes, provided the hotel or resort features a heated pool. High-end resorts maintain warm pool temperatures through the winter, though unheated pools will feel far too cold for comfort.
Does it ever snow in Phoenix during December?
Snow in the city proper is exceptionally rare. While surrounding high-elevation areas like Flagstaff receive plenty of winter snow, Phoenix sits in a low desert basin where measurable snowfall hasn't occurred in decades.
How windy is Phoenix in December?
December is historically the calmest month of the year for wind speed in Phoenix, averaging around 5 mph. Breezes are gentle, which makes the outdoor temperatures feel even warmer during peak daylight hours.
Do I need a rental car to get around?
While the downtown core features light rail transit, Phoenix is a sprawling metropolis. Renting a car gives you the flexibility to reach trailheads in the surrounding regional parks and explore neighboring Scottsdale or Mesa efficiently.
