Introductory Sommelier Practice Test

Grape quality is strongly influenced by climate, which is largely shaped by latitude. Most quality wines come from temperate zones where summers are warm enough to ripen grapes but winters aren’t severe. This favorable band runs roughly from 30 to 50 degrees latitude in both hemispheres, covering many renowned wine regions. Moving toward the equator tends to bring hotter, more challenging conditions for ripening, while farther toward higher latitudes can shorten the growing season and reduce ripening reliability. So, the latitudinal range that best describes where most quality wines are produced is about 30 to 50 degrees.