December in Orange County, California, typically offers mild, Mediterranean-climate conditions. Average daytime temperatures range from the mid-60s to low 70s Fahrenheit (18-22C), while nights cool down to the mid-40s to low 50s Fahrenheit (7-10C). Rainfall is possible, though less frequent than in other parts of the country during this time of year. Sunshine is abundant, and while occasional Santa Ana winds can bring warm, dry air, they can also increase wildfire risk.
Understanding typical climatic conditions for this period is vital for residents and visitors. This information informs decisions about clothing, outdoor activities, and potential travel disruptions. Historically, December has seen varied weather patterns in Orange County, from periods of drought to significant rainfall events. Knowing the typical weather helps prepare for the range of possible conditions, allowing for safer and more enjoyable experiences. This knowledge is particularly important for sectors like tourism and agriculture, which are significantly influenced by weather patterns.