December in Los Angeles often marks the beginning of the region’s distinct winter season, transforming the city into a destination where coastal breezes meet crisp, clear air. While many associate Southern California with perpetual summer, this month introduces a noticeable shift, characterized by lower humidity, reduced daylight, and temperatures that are cool without being harsh. Understanding the average temperature in Los Angeles in December provides essential context for anyone planning outdoor activities, managing energy costs, or simply appreciating the subtle beauty of the season.
Typical Temperature Ranges
The average temperature in Los Angeles in December reflects a moderate winter climate, where the influence of the Pacific Ocean keeps conditions comfortable. Across the basin, daily highs typically range from the upper 60s to low 70s Fahrenheit (around 20-22°C), while overnight lows generally fall between the mid-40s and low 50s Fahrenheit (7-11°C). These figures represent long-term averages derived from historical data, though specific readings can vary significantly based on neighborhood elevation and proximity to the coast.
Microclimates and Coastal Influence
Los Angeles is a city of dramatic microclimates, and December accentuates these differences. Beachfront communities like Santa Monica and Venice often experience temperatures that are several degrees cooler than the downtown core, with persistent marine layers creating cooler, foggier conditions. Inland areas, such as Studio City or the eastern San Fernando Valley, frequently enjoy warmer afternoon temperatures but can see significantly colder nighttime lows, sometimes dipping near freezing in the valleys.
Location | Average High | Average Low
Downtown Los Angeles | 68°F (20°C) | 48°F (9°C)
Santa Monica (Beach) | 66°F (19°C) | 49°F (9°C)
San Fernando Valley (Inland) | 70°F (21°C) | 43°F (6°C)
Daylight and Atmospheric Conditions
Beyond the thermometer, the feel of a December day in Los Angeles is defined by its unique atmospheric quality. The sun rises later and sets earlier, resulting in approximately 10 hours of daylight, with twilight periods becoming more pronounced. The air tends to be clearer and less hazy than in summer, offering stunning visibility of the surrounding mountains and enhancing the perceived sharpness of the landscape.
Rainfall and Its Impact on Temperature
December is a key month in Los Angeles’s rainfall calendar, and precipitation plays a significant role in temperature perception. While the month is generally dry, the first significant storms often arrive in December, dropping temperatures temporarily. Rain-cooled air can push daytime highs into the 60s, but these systems are usually followed by periods of strong sunshine, allowing temperatures to rebound quickly.
What to Wear and Plan For
Navigating the average temperature in Los Angeles in December requires a layered approach to dressing. Light sweaters or fleeces are essential for mornings and evenings, while breathable shirts work perfectly for sunny afternoons. For visitors, this balance creates ideal conditions for exploring the city’s outdoor attractions, from Griffith Observatory to the Getty Center, without the intense summer heat.
Seasonal Activities and Tourism
The moderate temperatures of December support a vibrant calendar of seasonal events that distinguish Los Angeles from other major cities. Holiday markets remain active through the month, and the cooler weather makes outdoor festivals more comfortable than the summer crowds. Furthermore, the reduced tourist volume compared to spring break allows for a more relaxed experience at popular destinations, from the beaches to the city’s renowned dining scene.
