December in Los Angeles presents a fascinating paradox for visitors and residents alike. While much of the Northern Hemisphere braces for winter, Southern California enters a period of remarkable climatic stability. This month represents a transition, moving from the intense fall warmth toward a milder, more moderate winter pattern. Understanding the average temperature Los Angeles experiences during December provides essential context for planning everything from outdoor festivals to simple evening walks.
Typical December Temperature Ranges
The defining characteristic of Los Angeles weather in December is its gentle moderation. Average high temperatures typically hover between 68°F (20°C) and 72°F (22°C), creating an environment that feels more like early autumn than winter. Overnight lows, while cooler, rarely dip into the uncomfortable cold, averaging between 48°F (9°C) and 52°F (11°C). This narrow band of thermal comfort is the result of the Pacific Ocean's immense thermal inertia, which acts as a massive buffer against extreme temperature fluctuations.
Coastal vs. Inland Variations
Los Angeles is not a monolithic climate zone, and this truth becomes especially apparent in December. The coastal areas, including Santa Monica, Venice, and Marina del Rey, benefit from the ocean's moderating influence. Residents here experience the smallest temperature swings, with highs often reaching the mid-70s°F and lows staying comfortably above 50°F. Inland neighborhoods like Studio City, Burbank, and the San Fernando Valley, however, can see more significant daily swings, with daytime highs potentially reaching 75°F (24°C) but nighttime lows dipping closer to 45°F (7°C).
Daylight and Sunlight in Mid-December
Beyond temperature, the December sky over Los Angeles undergoes a noticeable shift. The month begins with approximately 10 hours of daylight, with sunrise around 6:45 AM and sunset near 4:45 PM. This provides ample daylight for outdoor activities, though the afternoon sun takes on a lower, more golden angle. This astronomical angle is a key factor in the perceived temperature, as the sun’s rays pass through more of the Earth’s atmosphere, scattering light and reducing direct intensity compared to the summer months.
Rainfall and Its Impact on Temperature Perception
While Los Angeles is famous for its sunshine, December is the inaugural month of the rainy season. The average precipitation is around 3 to 4 inches, typically falling in 3 to 5 separate storm events. These rain events, often originating from atmospheric rivers, introduce a distinct chill to the air. Even though the actual temperature might remain in the 60s°F, the combination of overcast skies, higher humidity, and a persistent breeze can make the feel-like temperature drop significantly, creating a sharper, more penetrating cold than the thermometer suggests.
What to Wear and Seasonal Activities
Dressing for Los Angeles in December requires a strategic layering approach. Light sweaters, long-sleeve shirts, and comfortable pants are staples for the daytime. The necessity of a jacket, however, is entirely dependent on location and time of day. A light windbreaker may suffice for a midday stroll on the beach, while a medium-weight jacket becomes essential for an evening in the hills or an inland suburb. This versatility in wardrobe is a direct reflection of the city’s average temperature profile.
Comparative Context and Historical Data
Placing December temperatures in a broader historical context reveals remarkable consistency. Over the past three decades, the average high for December has remained remarkably stable, fluctuating within a narrow 2-3 degree range. This stability is a hallmark of the Mediterranean climate that defines Southern California. Unlike regions with volatile winter weather, Los Angeles offers a reliable baseline of cool, pleasant days, making it a popular destination for those seeking to escape harsher winter conditions elsewhere.
