CLIMATE
Elevation has a major influence on Lake County's climate. At 1300 to 2500 feet, cooler winters delay budbreak. This pushes wine grape harvest into September and October, and these cooler months allow gradual ripening and excellent flavor development.
Most summers see at least a handful of days with temperatures over 100°F, however several factors reduce the frequency and duration of these highs. Cool winds off the Pacific frequently moderate afternoon temperatures, and the county's elevation and exceptionally clear air leads to significant radiational cooling at night. Diurnal temperature swings are frequently 30 to 50 degrees.
Lake County's climate may also give growers a boost in pest management. A recent study of the four North Coast Counties plus San Joaquin and Monterey Counties confirmed what Lake County growers have long suspected. Pesticide use in almost all categories was lower in Lake and Mendocino counties. Why the difference? Cold winters and a compressed growing season may reduce pest build up, and dry conditions discourage powdery mildew and botrytis. Grower efforts to reduce pesticide use are also part of the equation. Organic and biodynamic farming is quickly transitioning from conventional farming practices.
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