December in Los Angeles presents a distinct shift from the bustling energy of late autumn, offering a more relaxed pace as the holiday season begins to take hold. While the city rarely experiences the dramatic weather changes found elsewhere in the nation, this month introduces a nuanced transition that defines the Southern California winter. Travelers planning visits and locals adjusting their routines both find value in understanding the specific conditions, from temperature fluctuations to the occasional rain event. This overview details the typical atmospheric patterns, providing a reliable guide for anyone navigating LA during this festive period.
Temperature and Overall Climate
The most defining feature of Los Angeles weather in December is its inherent mildness, serving as a refuge for those escaping harsher climates. Average high temperatures typically range from the mid-60s to low 70s Fahrenheit (18-22°C), creating an environment suitable for light layers rather than heavy winter coats. Overnight lows, however, tell a different story, often dipping into the upper 40s to low 50s Fahrenheit (9-11°C), particularly in areas farther from the moderating influence of the ocean. This significant day-to-night temperature swing dictates wardrobe choices, making a light jacket or sweater essential for evenings while shorts and t-shirts remain appropriate for sunny afternoons.
Microclimates and Geographic Variation
Los Angeles is not a monolith when it comes to weather, and December amplifies the city's famous microclimates. Coastal districts like Santa Monica and Venice Beach benefit from the Pacific Ocean's inertia, enjoying cooler temperatures, persistent sea breezes, and a higher likelihood of marine layer intrusion. Inland areas, such as the San Fernando Valley or neighborhoods like Downtown and East LA, tend to be warmer, sunnier, and more sheltered from the ocean's cooling effect. Mountain communities like Beverly Hills or the Hollywood Hills occupy an intermediate zone, often experiencing temperatures similar to the basin but with increased chances of frost at higher elevations.
Precipitation and Humidity
While Los Angeles is synonymous with sunshine, December is a key month in the region's wet season, marking the start of the rainy period that continues through early spring. The month contributes a meaningful portion of the city's annual rainfall, though significant downpours are not the norm. Occasional atmospheric river events can deliver intense bursts of rain over short periods, while more typical systems provide gentle, multi-day soaks that replenish reservoirs and green spaces. Humidity levels rise compared to the arid summer months, creating a dampness in the air that is noticeable but rarely oppressive, adding a crispness to the atmosphere.
Rainfall Expectations and Planning
Visitors and residents should anticipate a mix of dry and wet days rather than a constant drizzle. It is common to experience stretches of several consecutive sunny days followed by a system that brings clouds and rain for a few days. When planning outdoor activities, checking the forecast becomes increasingly important as the month progresses. Carrying a compact umbrella or a waterproof jacket is a practical recommendation, ensuring that a passing shower does not disrupt plans. The rain, when it arrives, is generally welcomed as it breaks the dry spell and contributes to the region's water supply.
Sunshine, Clouds, and Daylight
December offers Los Angeles its shortest days of the year, with the winter solstice occurring near the middle of the month. Daylight hours are reduced, providing roughly 10 hours of light, with sunrise occurring around 6:45 AM and sunset around 4:45 PM. This shift means that the city’s famous sunshine is concentrated into a smaller window, making midday appearances particularly valuable. Cloud cover increases compared to the summer months, but the iconic blue skies often return between systems, creating dramatic contrasts against the deep ocean and mountain backdrops.
