Bordeaux wines. However, many wines are produced in much warmer areas where a further increase in temperature might produce unbalanced wines with high alcohol content (resulting from high sugar levels and over-ripe fruit), lower acidity, and compromised flavor profiles. The hypothesis “warmer is better” may not be correct for these wine regions. In fact, the correlation of vintage rating and temperature may be negative or non-linear. To account for this possibility, a quadratic relationship between vintage rating and growing season temperatures was used. Equation (2) below assumes that increasing growing season temperatures improve the ripeness of the grapes and therefore the quality of the wines, but at a decreasing rate and that ultimately, if temperature is higher than a certain optimum, grape quality declines: