Spanish Wine - Geography and Climate

Geography and Climate

One of the dominant geographical influences of Spanish viticulture is the vast plateau known as the Meseta Central that covers much of central Spain. From there flow to the sea several of Spain's principal rivers that are at the heart of many Spanish wine regions. These include the eastward flowing Ebro river that runs through the Rioja and several Catalan wine regions; the Duero which flows westward through the Ribera del Duero region in Spain before crossing the border into Portugal's Douro Valley which is at the heart of Port wine production; the Tajo which runs through the La Mancha region; Guadalquivir which flows into the Atlantic at the Sherry producing village of Sanlúcar de Barrameda. In addition to the Meseta Central, several mountain ranges known as cordilleras serve to isolate and influence the climate of several Spanish wine regions. These include the Cantabrian Mountains that spur westward from the Pyrenees and protect regions like the Rioja from the rain and the cool of westerlies coming from the Bay of Biscay. The Cantabrian Mountains act as a rain shadow with the coastal regions of the Basque Country receiving an average of 59 inches (1,500 mm) while the winemaking region of Rioja, near Haro, around 62 miles (100 km) away receives only 18 inches (460 mm). In Galicia on the northwest coast, the region receives annual rainfall that ranges from 39 inches (990 mm) on the coast to 79 inches (2.0 m) near the mountainous border of Castile and León.

The climate gets more extreme further inland towards the Meseta Central and is characterized by hot summers with temperatures that can reach 104 °F (40 °C) with drought conditions. Many regions receive less than 12 inches (300 mm) of rain annually with most of the rain falling during sudden downpours in the spring and autumn that can pose the risk of flash flooding. Winters in these regions are characterized by cold temperatures that can often fall below freezing around −8 °F (−22 °C). Towards the southeast, around Valencia, the climate is more moderate with the strong Mediterranean influence. In the south, the Sherry and Malaga producing regions of Andalusia contain some of the hottest parts of Spain. North of the Sierra Nevada mountains in the Guadalquivir Valley, temperatures often reach 113 °F (45 °C) in the summer. To adapt to these high temperatures, many Spanish vineyards will be planted on higher elevations, with many vineyards located over 2,000 feet (610 m) above sea level. These high altitudes create a large diurnal temperature variation with low night time temperatures that allow the grapes to maintain acidity levels and colouring. Regions with lower altitude vineyards, such as along the southern Mediterranean coast are suitable for producing grapes of high alcohol levels and low acidity.