While much of California’s Sonoma County is warm all year round, the maritime climate of its coastal wine-growing regions is a viticultural sweet spot, combining cool, even temperatures, cold winds and fog. A Pacific marine layer cools down those appellations closest to the coast each morning, lingering in some places before burning off in the midday sun. Cold ocean air funnels its way inland from the coast through corridors, resulting in high winds that affect grape-growing conditions.
