Lake County Climate

For detailed information on the effect of climate in the Lake County winegrowing region, download this 2015 report by Dr. Gregory Jones PhD, Southern Oregon University.

Lake County’s winegrape regions are the beneficiaries of ideal climate conditions that complement the pure air, elevated locales, and rich, varied soils.

Clear Lake, the valley floors, the surrounding mountain ranges, and Lake County’s proximity to the Pacific Ocean are factors in the microclimates found in the region’s AVAs – High Valley, Kelsey Bench, Middletown, Big Valley, Red Hills, and Upper Lake.

Most of Lake County experiences a mix of bright sunlight bringing warm days and afternoon breezes that bring cooling that often results in 50-degree diurnal cycles.

Climate Page (Beckstoffer, Red Hills)

In the High Valley AVA, elevation along with the cooling effects of Clear Lake create a natural and perpetual “wind machine.” During July and August, daily temperature swings of 50 degrees are not uncommon. This intense cooling effect promotes good acidity, improved tannic structure, darker color, and more concentrated fruit character.

Lake County’s wine grapes enjoy high levels of UV light due to climate and clean air. UV levels can reach up to 10 percent more than regions in neighboring sea level valleys. This UV intensity triggers thicker winegrape skins, greater tannins, and intense wines with high phenolic content.

With vineyards starting at 1,350 feet and reaching up to 2,600 feet above sea level, Red Hills of Lake County grapes are grown in mountain climate conditions. Upper level airflows from the Pacific Ocean combine with local convections to moderate daytime highs. Low relative humidity and varied topography permit quick radiative cooling of ridgetop vineyards in the late afternoon and evenings. Both factors allow for good acid retention during ripening.

Grapes grown in the Upper Lake AVA at 3,000-4,000 feet in elevation are surrounded by the Mayacamas range and the mountains of the Mendocino National Forest which impart a strong influence on the local climate. Summer’s heat loses its grip in September when temperatures swing dramatically from morning chill to afternoon warmth. The cool nights preserve the acidity of the grapes and slow the ripening process, enhancing the flavor and complexity of the wine.

Cold winters and dry summer conditions throughout the regions are important factors in Lake County’s reduced pesticide and other application rates, one of the lowest in California.

Calendar of Events

Sun Mon Tue Wed Thu Fri Sat
U.S. Sustainable Winegrowing Summit West 2:00 pm
U.S. Sustainable Winegrowing Summit West @ Sonoma County, CA
Jun 6 @ 2:00 pm – Jun 7 @ 3:00 pm
Who: A gathering of regional winery and vineyard associations, engaged grower and vintner leaders, and others committed to the sustainability of their local vineyards, wineries and regions. What: Learn some of the driving forces behind consumers’ and[...]
Implementing Sustainable Farming Practices: Water and Pest Management 8:30 am
Implementing Sustainable Farming Practices: Water and Pest Management
Jun 13 @ 8:30 am – 1:00 pm
Special Targeted Education Event for Growers sponsored by: California Sustainable Winegrowing Alliance & Lake County Winegrape Commission Welcome, Debra Sommerfield, Lake County Winegrape Commission & Clint Nelson, Vineyard Manager, Beckstoffer Vineyards – Red Hills Increasing Performance[...]
AgVenture Lite: What we know about Clear Lake 5:30 pm
AgVenture Lite: What we know about Clear Lake @ Soper Reese Community Theatre
Jun 13 @ 5:30 pm – 8:00 pm
The Lake County Chapter of California Women for Agriculture and Lake County Winegrape Growers present AgVenture Lite: What we know about Clear Lake Clear Lake is thought to be over 450,000 years old making it[...]
LCWC Executive Committee Meeting 2:30 pm
LCWC Executive Committee Meeting @ LCWC Office
Jun 18 @ 2:30 pm – 3:00 pm
Agenda – LCWC Executive Committee, June 18, 2019
LCWC Board Meeting 3:00 pm
LCWC Board Meeting @ LCWC Office
Jun 18 @ 3:00 pm – 4:30 pm
Agenda – LCWC Board Meeting, June 18, 2019
Master Vigneron Academy®
Master Vigneron Academy®
Jun 19 all-day
Session #6 Lake County vineyards