Sonoma Valley Chamber of Commerce

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climate

The climate and geography of the Sonoma Valley make it not only a delightful place to live year-round, but also one of the world’s great grape-growing regions. Averaging 29 inches of rainfall per year, it is one of the driest areas in Sonoma County. The Mayacamas and Sonoma mountain ranges on either side isolate the Valley, allowing in just enough coastal fog to cool the vineyards on summer nights. Predominantly southerly winds off San Pablo Bay also moderate temperatures and extend the growing season. The Valley’s geological diversity features numerous microclimates and a variety of soils that enable growers to select the optimal growing conditions for each grape varietal.