December in Phoenix presents a distinct shift from the extreme summer conditions, offering a period of comfortable days and cool evenings that define the desert winter. This month marks a transition toward the drier and more temperate season, making it a popular time for visitors and a welcome change for residents. Understanding the typical weather patterns, including temperature ranges and precipitation likelihood, helps in planning activities and dressing appropriately for the season.
Typical Temperature Ranges
The average high temperature in Phoenix during December usually sits comfortably in the mid-60s to low 70s Fahrenheit, often around 67°F (19°C). It is common for afternoon warmth to create t-shirt weather under clear blue skies, a sharp contrast to the season in most other regions. Overnight lows, however, can drop significantly, frequently falling into the low 40s Fahrenheit or even touching the upper 30s on clear, calm nights. This notable difference between daytime highs and nighttime lows means layering clothing is essential for comfort throughout the day.
Daily Temperature Variations
December exemplifies Phoenix’s desert climate characteristic of large diurnal temperature swings. While the sun is strong during the day, the lack of humidity and cloud cover allows heat to escape rapidly after sunset. Mornings and evenings often feel crisp and cool, requiring a light jacket or sweater, especially for those exploring outdoor attractions at dawn or dusk. The midday sun, however, can feel quite warm on exposed skin, creating a need for sun protection like sunscreen and hats regardless of the season.
Sunshine and Precipitation
The city enjoys abundant sunshine throughout December, with the month typically recording over 300 hours of bright sunshine. Skies are predominantly clear, offering excellent visibility for sightseeing and outdoor recreation. Rainfall is infrequent during this period, with December being part of the drier season in the region. When precipitation does occur, it usually manifests as brief, light showers rather than prolonged storms, contributing to the overall pleasantness of the month.
What to Wear and Pack
Packing for a December visit to Phoenix requires preparing for a wide range of temperatures. Lightweight clothing for the warm afternoons, such as long-sleeve shirts, pants, and comfortable walking shoes, should form the base of your wardrobe. It is equally important to include warmer layers for the evenings, including a medium-weight jacket, sweaters, and long pants. Accessories like sunglasses and sun protection are just as important in December as they are in the summer months due to the intense UV index.
Outdoor Activities and Events
The favorable December weather makes it an ideal time to explore Phoenix’s outdoor offerings without the intense heat of summer. Hiking trails in locations like South Mountain Park or Camelback Mountain are particularly popular, as the cooler temperatures reduce the risk of overheating. Residents and tourists alike take advantage of the pleasant evenings for outdoor dining, concerts, and festivals, which are staples of the Phoenix cultural scene during this season.
Considerations for Travelers
While December is generally considered an excellent time to visit, travelers should be aware of a few practical details. The comfortable weather attracts many visitors, leading to higher occupancy rates and potentially increased prices for accommodations and flights compared to the summer slump. Planning reservations well in advance is recommended to secure preferred options. Additionally, while rain is rare, occasional cool snaps can bring temperatures lower than average, underscoring the value of checking a detailed forecast closer to your travel dates.
