weather in south california in december

3 min read 24-02-2025

Meta Description: Planning a December trip to Southern California? Discover what to expect from the weather: sunny days, mild temperatures, and the occasional rain shower. Pack light layers and prepare for beach days, but be aware of potential December surprises! Learn about regional variations and what to pack for a perfect SoCal December getaway.

December in Southern California: A Climate Overview

Southern California enjoys a Mediterranean climate, meaning warm, dry summers and mild, wetter winters. December falls squarely within the winter season, but "winter" here is a far cry from blizzards and freezing temperatures. Instead, expect pleasant days perfect for outdoor activities, punctuated by occasional rain showers. This makes December a popular time to visit.

While the overall climate is mild, significant regional variations exist. Coastal areas tend to be cooler and slightly wetter than inland regions. Mountain areas, such as Big Bear and Lake Arrowhead, experience significantly colder temperatures and more snowfall.

Average Temperatures and Rainfall in December

The average high temperature in December for Southern California's coastal regions hovers in the mid-60s Fahrenheit (around 18° Celsius). Inland areas, such as Los Angeles, see slightly warmer temperatures, with highs reaching the low 70s Fahrenheit (around 21° Celsius).

Rainfall in December is relatively low compared to other months, but it is the wettest month of the year for the region. Expect occasional showers, often brief and interspersed with sunny periods. Coastal areas typically receive slightly more rainfall than inland locations.

What to Pack for a Southern California December Trip

Layers: Pack layers to adapt to fluctuating temperatures throughout the day. A light jacket or sweater will suffice for daytime warmth, but evenings can be cool, particularly near the coast.
Sunscreen: Even on cloudy days, the Southern California sun can be strong. Don't forget your sunscreen!
Rain gear: A light raincoat or umbrella is recommended, especially if you plan on spending significant time outdoors.
Comfortable shoes: You'll likely be doing a lot of walking, so comfortable shoes are essential.

Regional Variations: Weather Across Southern California in December

While the overall climate is mild across Southern California, significant differences exist depending on location:

Coastal Regions (e.g., San Diego, Santa Monica):

Temperatures: Cooler temperatures, averaging highs in the mid-60s°F (around 18°C).
Rainfall: Slightly higher chance of rain than inland areas.
Activities: Beach walks, surfing (depending on conditions), exploring coastal towns.

Inland Regions (e.g., Los Angeles, Inland Empire):

Temperatures: Warmer temperatures, with average highs in the low 70s°F (around 21°C).
Rainfall: Less rain than coastal areas.
Activities: Hiking, exploring museums, visiting theme parks.

Mountain Regions (e.g., Big Bear, Lake Arrowhead):

Temperatures: Significantly colder temperatures, with potential for snow at higher elevations.
Rainfall/Snowfall: Higher chance of snow, especially at higher elevations.
Activities: Skiing, snowboarding, snowshoeing (if there's sufficient snow).

December Events and Activities

December in Southern California offers a variety of festive events and activities:

Holiday parades and celebrations: Many cities host holiday parades and celebrations throughout December.
Christmas tree light displays: Many locations feature spectacular Christmas tree lighting displays.
Outdoor concerts and events: Take advantage of the pleasant weather and attend outdoor concerts or events.
Whale watching: Gray whales migrate along the Southern California coast during December.

Planning Your Trip: Weather Considerations

When planning your Southern California December trip, consider these weather factors:

Check the forecast: Check the weather forecast closer to your travel dates for the most up-to-date information.
Be prepared for rain: Even though rainfall is not heavy, be prepared for occasional showers.
Pack layers: Be prepared for fluctuating temperatures throughout the day.
Choose activities wisely: Consider your chosen activities and choose ones appropriate for the weather conditions.

Conclusion

December in Southern California offers a delightful blend of sunshine, mild temperatures, and the occasional rain shower. Whether you prefer beach walks, theme park visits, or exploring the mountains, Southern California offers a diverse range of activities to enjoy. By understanding the regional variations and preparing accordingly, you can ensure a memorable and enjoyable December getaway in the Golden State. Remember to pack those layers and enjoy the Southern California sunshine!