Mission Viejo Weather in December

The climate in Mission Viejo during December can be summarized as mild and reasonably dry.

December is in the winter in Mission Viejo and is typically the coldest month of the year. Daytime maximum temperatures average around a cool 18°C (65°F), whilst at night 6°C (43°F) is normal.

On average December is the 4th wettest month of the year in Mission Viejo with around 44mm 1.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.8 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Mission Viejo in December 2024.