WEATHER December in Sonoma is often wonderful, with cool mornings and evenings, and warm afternoons. The temperatures average a high of 60° F and a low of 37° F in early December. However, rain is also common in December. The key is to “layer” since you never can tell this time of year in California. The following website could be helpful to check before you pack -- www.weather.com (linked to Sonoma, CA local weather). |