December in Los Angeles represents a seasonal pivot, where the frantic energy of late autumn fades and the city prepares for its mild winter. While much of the United States braces for freezing temperatures, Southern California enters a period of comfortable transition, blending lingering autumn warmth with the first hints of winter moisture. This month marks the beginning of the region’s rainy season, although sunshine remains a dominant feature, making it a popular time for visitors seeking a reprieve from colder climates.
Typical December Temperature Range
The defining characteristic of Los Angeles weather in December is its remarkable moderation. Daytime highs typically hover between the mid-60s and low 70s Fahrenheit (18-22°C), providing a pleasant respite from the chill found in other major cities. Overnight lows, however, can dip into the upper 40s to low 50s Fahrenheit (9-11°C), necessitating a light jacket or sweater for evening activities. This narrow diurnal temperature range creates an ideal environment, where layers are essential for comfort from morning to night.
December Weather Data at a Glance
Ocean and Sea Conditions
The Pacific Ocean remains a significant climatic influence throughout December, though the water temperature is at its coldest for the year. By mid-month, the sea temperature typically cools to around 58°F (14°C), making extended swimming without a wetsuit impractical for most people. However, dedicated surfers and winter swimmers embrace these conditions, drawn by the larger swells and consistent waves that the winter storms generate along the coast.
Rainfall and Humidity Patterns
December is a crucial month in Los Angeles’s water cycle, as it often signals the onset of the rainy season. While major downpours are not guaranteed, the month averages around 3.2 inches of precipitation, falling on approximately 4 to 5 days. When rain does arrive, it is often intense but brief, followed by clear, sunny breaks. The humidity levels remain comfortable, generally hovering around 65%, which prevents the muggy feeling common in other climates during the wet season.
What to Pack for a December Visit
Packing for Los Angeles in December requires a strategic approach focused on versatility. Lightweight sweaters and long-sleeve shirts form the base of the wardrobe, while a medium-weight jacket or a stylish wool coat is essential for evenings. Comfortable walking shoes are a must, as the city is best explored on foot, but ensure they are water-resistant to handle occasional showers. Sunglasses remain relevant during the day, but a compact umbrella should occupy a small corner of your luggage to be prepared for the sporadic winter shower.
