Arizona temps in December range from mild and comfortable in Phoenix to noticeably cooler in northern highlands and desert elevations. This guide helps you understand daily conditions, plan activities, and pack appropriately for the season.
December often brings some of the most pleasant weather of the year across much of Arizona, with lower humidity, clear skies, and moderate temperatures compared to summer extremes.
| Region | Average High | Average Low | Typical Conditions |
|---|---|---|---|
| Phoenix Metro | 68–72°F (20–22°C) | 48–52°F (9–11°C) | Sunny, low humidity, occasional rain |
| Tucson | 65–68°F (18–20°C) | 42–46°F (6–8°C) | Sunny, clear nights, dry |
| Flagstaff | 45–50°F (7–10°C) | 20–26°F (-7 to -3°C) | Partly cloudy, possible snow at higher elevations |
| Sedona | 58–62°F (14–17°C) | 32–36°F (0–2°C) | Cool mornings, sunny afternoons |
Daytime Warmth in Phoenix and Tucson
Daytime warmth in Phoenix and Tucson during December feels close to ideal for many visitors. Highs typically sit in the upper 60s to low 70s Fahrenheit, encouraging outdoor dining, walking tours, and sightseeing without the intense summer heat.
These cities enjoy abundant sunshine, with crisp morning air giving way to pleasant afternoon conditions. Light layers work best, letting you adjust as temperatures rise mid-day and dip again once the sun lowers.
Because humidity remains low, the perceived temperature often feels more comfortable than the actual number suggests. You can usually skip heavy jackets, yet keeping a sweater handy is wise for shaded areas and breezy moments.
Cooler Evenings and Desert Nights
Cooler evenings and desert nights are a signature feature of Arizona in December, especially away from the urban heat island effect. While Phoenix may dip into the high 40s, higher desert towns and mountain areas can experience freezing lows.
Sunset often brings a rapid temperature drop, particularly in dry climates where heat stored in the ground releases quickly after dark. This contrast between warm days and chilly nights creates a refreshing rhythm for outdoor plans.
For travelers, this means packing a mix of short sleeves for the day and warmer layers for evenings. A light insulated jacket or fleece makes sunset walks, rooftop dinners, or camping much more enjoyable.
Mountain and High Country Winter Weather
Mountain and high country winter weather introduces a sharper edge to Arizona temps in December, especially above 5,000 feet. Flagstaff and areas near the Mogollon Rim commonly see snow and temperatures below freezing at night.
Higher elevations may experience several inches of snowfall, transforming the landscape into a winter scene suitable for skiing, snowshoeing, and cozy mountain towns. Roads can be impacted, so it is important to check conditions before heading into remote areas.
Visitors planning mountain activities should bring insulated gear, waterproof boots, and be prepared for rapidly changing conditions. Keeping updated on forecasts adds confidence and safety to high-country exploration.
Outdoor Activities and Planning Tips
Outdoor activities and planning in Arizona during December benefit from understanding regional temperature patterns. Cities like Phoenix, Scottsdale, and Tempe offer comfortable conditions for golf, hiking, and festivals, while northern regions cater to winter sports enthusiasts.
Choosing the right time of day for strenuous activities maximizes comfort, with early mornings and late afternoons often being the most pleasant in hotter lowland zones. In mountain zones, midday warmth can be brief, so scheduling outdoor adventures around clearer, sunnier windows is helpful.
Regardless of region, simple preparation such as checking forecasts, bringing layers, and allowing time to adjust to elevation changes makes December travel smoother and more enjoyable.
FAQ
Reader questions
Will I need a heavy winter coat in Phoenix in December?
You will not need a heavy winter coat in Phoenix in December. A light jacket or fleece is usually enough for evenings, while daytime often feels comfortable in shirtsleeves.
Is it colder in Tucson or Phoenix during December nights?
Tucson is often slightly cooler than Phoenix at night in December, though both cities typically stay above freezing. Expect lows in the low to mid-40s°F, making a medium-weight jacket advisable.
Can I visit the Grand Canyon in December, and what should I expect temperature-wise?
Yes, you can visit the Grand Canyon in December, but temperatures vary widely by rim. The South Rim averages highs near 45°F and lows near 20°F, so pack warm layers and prepare for possible snow on the rim.
Do northern Arizona ski resorts get enough snow in December to visit?
Northern Arizona ski resorts generally receive reliable snow in December, creating solid conditions for skiing and snowboarding. Resorts near Flagstaff often have good coverage, but it is wise to check recent reports before travel.