Climate: Moderate, with definite cool marine influence and fog contributing to cool summer mornings and the marine breeze keeping afternoons more comfortable than further up valley. Mid-summer peak temperatures may reach 90°F (31°C), with noticeable diurnal fluctuation to the mid-50°F range (13°C).
Elevation: 20 to 200 ft (6 to 61m).
Rainfall: 32 inches (80 cm) annually.
Soils: Principally gravelly silt loams, sedimentary in origin, and gravelly alluvial soils with rock, moderately fertile.
Principal varieties & characteristics: Cabernet Sauvignon, Merlot: Yountville favors Cabernet and Merlot with ripe, violety aromas and rich, but supple flavors and firm tannins.