Napa Valley in December experiences a transition into its wet season. Average temperatures typically range from highs in the mid-50sF (low 10sC) to lows around 40F (4C). Rainfall becomes more frequent, contributing to the region’s annual precipitation total. This cooler, damper period marks a shift from the warmer, drier months of summer and fall.
Understanding the climatic conditions of this period is crucial for visitors planning trips and for businesses operating within the wine and tourism industries. The dormant season for grapevines begins, allowing the soil to absorb rainwater vital for the following year’s growth. Historically, this period offered a respite for vineyard workers after the harvest season. While some wineries maintain regular hours, others adjust their schedules or operations for the winter months. This period offers a unique perspective on the valley, showcasing its quieter, more introspective side.