Chilean Wine - Climate and Geography

Climate and Geography

Chile is a long, narrow country that is geographically and climatically dominated by the Andes to the east and the Pacific Ocean to the west. Chile's vineyards are found along an 800-mile stretch of land from Atacama Region to the Bio-Bio Region in the south. The climate is varied with the northern regions being very hot and dry compared to the cooler, wetter regions in the south. In the Valle Central around Santiago, the climate is dry with an average of 15 inches (38 centimeters) of rain and little risk of springtime frost. The close proximity to the Dry Andes help create a wide diurnal temperature variation between day and nighttime temperatures. This cool drop in temperature is vital in maintaining the grapes' acidity levels.

Most of Chile's premium wine regions are dependent on irrigation to sustain vineyards, getting the necessary water from melting snow caps in the Andes. In the developing wine regions along the Coastal Ranges and in the far south, there is not a lack in needed rainfall but vineyard owners have to deal with other factors such as the Humboldt Current from the Pacific which can bathe a vineyard with a blanket of cool air. For the rest of Chile's wine regions, the Coastal Ranges serve a buffer from the current and also acts as a rain shadow. The vineyards in these regions are planted on the valley plains of the Andes foothills along a major river such as the Maipo, Rapel and Maule Rivers.

The vineyards of Chile fall between the latitudes of 32 and 38° s which, in the Northern Hemisphere would be the equivalent of southern Spain and North Africa. However the climate in Chile's wine regions is much more temperate than those regions, comparing more closely to California and Bordeaux. Overall, it is classified as a Mediterranean climate with average summer temperatures of 59-64°F (15-18°C) and potential highs of 86°F (30°C).