Coombsville weather is moderated by its proximity to the San Pablo Bay.  Frosts are mitigated, fog covers settle more frequently and burn off later in the day than our neighbors to the North. The vines bud early and the grapes tend to be harvested later, making for a long, slow ripening period. Daily average high temperatures can be as much as ten degrees cooler during the hot months than most other appellations, and heatspikes tend to be less severe. All of this limits dehydration, preserves acidity levels, and generally aids even ripening patterns.