United States: Viticulturists on impacts of climate change on wine country

Viticulturists report that climate change is causing more cool air to come into the Livermore Valley in California earlier each day, shortening the growing day and necessitating more growing days in the season to achieve optimal ripeness for varieties like Cabernet Sauvignon and Cabernet Franc. At some point in time, the Valley may have perfect conditions to ripen Cabernet Franc but be unable to ripen Cabernet Sauvignon adequately before the winter rains arrive.