Mid-April is upon us in the Valley, which means temperatures are beginning to hint at summer. The macho among us will make a point of bragging about not turning their A/C on until it hits such and such temperature, as if were a contest to see how much heat they can endure. I, however have already turned mine on and have already begun thinking about how to keep cool during the hot season. Naturally, my thoughts turn to which wines will slake the inevitable summer thirst. Northern Italian whites fit the bill perfectly. Northern Italy is home to many unique, accessible, and refreshing white wines. Here are a few of my favorites.