Which factor is not typically associated with high-quality grape production in Mendoza?

Mendoza, renowned for its exceptional wine production, particularly Malbec, benefits from specific climatic and geographical factors that contribute to high-quality grape cultivation. High altitude is crucial in Mendoza because it allows for cooler temperatures, which help keep grapes healthy while promoting acidity and flavor development. Low temperatures at night are also beneficial, as they slow down the ripening process that can lead to the development of more concentrated flavors and aromas in grapes. Furthermore, the region's high sunlight intensity helps enhance the physiological ripening of grapes, ensuring they achieve their optimal flavor profiles and sugar concentrations.

Excessive rainfall, on the other hand, is typically not associated with high-quality grape production. It can lead to various problems such as dilution of flavors, increased disease pressure, and issues with harvesting. Grapes thrive in drier conditions, where they can develop more concentrated flavors and sugars without the complications associated with high moisture levels in the environment. Thus, excessive rainfall would be detrimental to the high-quality grape production that Mendoza is known for.