Because climate has an impact on the way wine grapes grow, it has an impact on the flavors of the wine those grapes make; wines made from grapes grown in warm climates tend to be fruitier and less acidic, while wines made from grapes grown in cool climates tend to be more tart and acidic. This is because grapes grown in warmer climates have more time to ripen on the vine before they are picked, which lends a fruitier flavor to the finished product, whereas vineyards in cooler climates experience less time in optimal ripening conditions. California, southern France, southern Italy and South Africa are all examples of warm climates where wines are produced, while Northern France, Oregon, Washington State, Chile and Germany are cool-weather places that have famous wine-growing regions.
There is a bit of a trade-off when it comes to grape-growing temperatures and the final flavors of a wine. Warmer temperatures allow the fruit to ripen more fully, but cooler temperatures preserve the fruit's acidity. However, this is all a general rule of thumb. Different weather conditions can be present across different vintages, or years, in which wine is produced in either a generally cool or generally warm climate. For example, a particularly late and warm Oregon summer may produce a fruitier wine in what is normally a cooler climate.