Degree Days: A method of classifying the climate based on the number of days the temperature is within a range that vines can grow. In California, climates are rated from coolest (Region I) to the warmest (Region V). This classification can help winemakers determine where to plant which variety.

日度值: 一种葡萄树生长温度区间天数持续的分类方法。在加州，气候带被分为最冷的（1区）到最热的（5区）。这种分类可以帮助酿酒师决定在哪个区域种植哪个品种。