Source: Napa Valley Vintners

The Napa Valley Vintners (NVV), a non-profit trade association, announced the release of the Napa Valley-specific climate study titled Climate and Phenology in Napa Valley: A Compilation and Analysis of Historical Data by Daniel R. Cayan, Ph.D., Kimberly Nicholas, Ph.D., Mary Tyree and Michael Dettinger, Ph.D.

In 2006, a researcher garnered national media attention by predicting that Napa Valley would soon become too warm to grow fine wine grapes. These reports noted signs of warming in California and the western United States in recent decades, calling attention to several changing indicators in weather, hydrological and biological systems. Evidence from other Mediterranean climate regions around the world indicated that climate warming may be taking hold in these settings. However, the experience of Napa Valley growers has been contrary to the notion that Napa Valley has warmed substantially. A problem in applying this previous research to the Napa Valley is that it has considered just a few weather station records in Napa Valley, which has long been known for very diverse micro-climates and growing conditions. 

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