What type of climate is Sonoma County?

Coastal Weather Temperate year-round, the weather on the Sonoma Coast follows a pattern of maritime fog in the morning which gives way to California sunshine around noon. When inland valleys heat up, the coast remains cool. The weather can be changeable; layered clothing is recommended.



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Instead, the county comprises 19 microclimates, with diverse soils, topography, and weather, all of which affect the terroir, or wine-growing environment. Sonoma County is a study in geography and topography, which determines what types of grapes can be successfully grown in each microclimate.

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Most of the County receives but little snowfall, average seasonal totals of less than 1 inch being characteristic of all low elevation stations.

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The annual one-day snapshot found a total of 2,266 individuals experiencing some form of homelessness. The official results from the 2022 count were 2,893. The 22 percent decrease in homelessness is the largest reduction since a 27 percent decrease in 2015.

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During an average summer there are many days when fog maintains a band of cold air all along the coastline and cold breezes blow a fog bank in through the Petaluma gap northward toward Santa Rosa, and northwestward toward Sebastopol. It also moves around Sonoma Mountain, not quite reaching Glen Ellen.

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Highlights of Climate Action 2020 and Beyond The plan is focused on near term actions that will put Sonoma County on a path towards a 2050 goal of 80% below 1990 levels. Plan success will require collaboration and investment by government, businesses, and citizens.

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