Time to Keep It Cool In the Summer Time

A long-standing convention says that white wines and roses should be served cool, while red wines should be served at room temperature. But if it’s hot outside and you happen to be outside, sometimes it’s time for you and your wine to cool off.

However, over chilling white wines can have a negative effect because you reduce the overall flavor and aroma of the wine.

A good guideline to use is the wine's body (as opposed to its color). Lighter bodied wines are better when they’re chilled to a lower temperature. Full-bodied wines would be spoiled if chilled to the same degree. So, serve your Pinot Grigio, Sauvignon Blanc or Riesling cooler than your Chardonnay. Also, keep your Pinot Noir or Gamay Noir cooler than Cabernet or Shiraz.
As British wine expert Jancis Robinson explains: "Because white wines tend to be lighter than reds, the conventional wisdom of chilling them does usually work -- but there are exceptions."