Vinifera and even table grapes in the warmest areas of Region V. The general ripening capabilities include hybrid grape varieties through early season, mid-season, and late season ripening V. The system was originally developed for and is used officially in California and was based on the general ripening capabilities and wine styles that can be achieved in the climate due to heat accumulation (growing degree-days). Typically only suitable for extremely high production, fair quality table wine or table grape varieties destined for early season consumption are grown. vinifera.Įarly and mid-season table wine varieties will produce good quality wines.įavorable for high production of standard to good quality table wines.įavorable for high production, but acceptable table wine quality at best. Only early ripening varieties achieve high quality, some hybrid grape varieties but mostly V. Only very early ripening varieties achieve high quality, mostly hybrid grape varieties and some V. General ripening capability and wine style All days during the growing season are then added up (all negative values are set to zero), with the sum of the growing degree-days used to determine the region's classification in the original Winkler index as follows: Each day during the growing season (assumed under the system to be April 1 through October 31 in the Northern Hemisphere October 1 through April 30 in the Southern Hemisphere) are assigned growing degree-days according to the amount that the day's average temperature exceeds this threshold one degree day per degree Fahrenheit over 50 ☏ (or with SI units, degrees Celsius over 10 ☌ is used). The system is based on both the hypothesis and observations that grapevines do not grow if the temperature is below 50 ☏ (10 ☌).
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