Climatic regions of Argentina

Argentina is a very large country with many different climates. Because it stretches from near the equator to the southern part of South America, it has many kinds of weather. In the north, it is hot and wet, while in the far south, it can be very cold. The central part, called the Pampas, has mild and wet weather.

In the northeast, a place called Mesopotamia is always warm and wet because winds from the Atlantic Ocean bring lots of rain. The Chaco region is very hot and lies between tropical and temperate areas, which is unusual. As you move west in this area, there is less rain, and the plants change from forests to shrubs.

Central Argentina, including the Pampas and Cuyo, has warm summers and cooler winters. The Andes mountains block rain from the Pacific Ocean, making Cuyo quite dry. However, because the land changes height a lot, the climate can vary, with very cold temperatures at high altitudes.

In the south, Patagonia is dry, except near the west coast where there are forests, glaciers, and snow. The weather there is cooled by winds from the west, and rain mostly falls in the winter, sometimes as snow.

Definition of the regions

Argentina has four main climate types: warm, moderate, arid, and cold. These types are shaped by the country's large size, varied heights, and natural features. Argentina has many different climates, from warm and wet areas in the north to very cold areas in the far south. In between, the Pampas region has a mild and moist climate. This leads to many different kinds of plants and animals across the country.

Argentina can be split into six main areas based on its climates. From north to south, these are Northwest, Chaco, Northeast, Cuyo/Monte, Pampas, and Patagonia. Each area has its own special kinds of plants.
Main article: Köppen climate classification
Main articles: Humid Subtropical, semi-arid, subtropical highland oceanic, Mediterranean, tundra, biomes

Mesopotamia

The region of Mesopotamia includes the provinces of Misiones, Entre Ríos and Corrientes. It is located between the Uruguay and Paraná rivers, which act as natural borders.

Mesopotamia has a humid subtropical climate, with warm temperatures and lots of rain all year. Rain falls often because the area is north of high pressure belts, allowing moist winds from the Atlantic Ocean to reach it. Droughts are rare, and the region usually gets more rain than it loses through evaporation.

Chaco

The Chaco region is found in the north-central part of Argentina. It includes the provinces of Chaco and Formosa, along with parts of Jujuy Province, Salta Province, Tucumán Province, Córdoba Province, Santa Fe Province, and most of Santiago del Estero Province.

This area has a warm, subtropical climate. The western part is drier, while the eastern part gets more rain. Summers are hot and wet, often bringing strong thunderstorms. Winters are dry and milder. The whole region sees a fair amount of rain, but it can vary a lot from year to year. The east gets more rain and has more forests, while the west is drier with different kinds of trees and bushes. Temperatures can get very hot in summer and fairly cool in winter.

Northwest

Northwest Argentina includes the provinces of Catamarca, Jujuy, La Rioja, and western parts of Salta Province and Tucumán Province. Even though Santiago del Estero Province is part of northwest Argentina, much of it lies in a different area called the Chaco region.

Northwest Argentina is mostly dry, hot, and warm, but because of its hilly and mountainous landscape, the weather can change a lot depending on how high you are, how warm it is, and how much rain falls there. Because of these changes, the plants and trees that grow there can also be very different. Generally, the weather can be split into two main types: colder and drier conditions at higher altitudes, and warmer, more tropical conditions in the eastern parts of the region. According to a way scientists classify weather, this area has five different kinds of climates.

The way the air moves in this part of the world is guided by two big, steady high-pressure areas over the South Atlantic and South Pacific Oceans, along with a low-pressure area called the Chaco Low. During the summer, the interaction between the South Atlantic High and the Chaco Low brings winds from the northeast and east, carrying moisture to the region, especially in the northern parts. Most of the rain comes from the east because big mountains called the Andes block moisture from the Pacific Ocean. Cold winds moving north from the southern parts of the region help bring rain during the summer too. In the winter, these wind patterns change, and the area gets much less rain.

Cuyo

The Cuyo region includes the provinces of Mendoza, San Juan, and San Luis. It has a dry or very dry climate, with temperatures that can change a lot depending on the height above sea level. In general, the climate is mild, but at very high altitudes, it can stay icy all year.

Most of the rain in Cuyo falls during the summer months. Some areas get very little rain, while others can get more. The region is known for its sunny weather and is a good place for growing grapes to make wine.

Pampas

The Pampas covers parts of Buenos Aires Province, Córdoba Province, La Pampa Province, and Santa Fe Province. It has two main areas: a wetter part in the east and a drier part in the west.

The Pampas has a warm and wet climate with hot summers and mild winters. The weather changes a lot because different air masses meet here. Cool winds come from the south, while warm, humid air comes from the north. These meeting air masses can create strong thunderstorms with heavy rain and hail. The Pampas also sees some tornadoes, more than most places outside the United States. Rain falls more in the east and less in the west, with most of it coming in the summer. Winters are usually dry and mild, with very little snow.

Patagonia

Chubut, Neuquén, Río Negro, Santa Cruz, and Tierra del Fuego are the provinces that make up Patagonia.

Patagonia has a dry to semi-dry climate that is temperate to cool. One special area is the Bosque Andino Patagónico, a forest in the far west and south of Tierra del Fuego Province, which has a wet, cool climate. Strong winds from the west blow all year, making the region dry. These winds can gust over 100 km/h (62 mph). The Andes mountains, the South Pacific, and the South Atlantic are three big factors that shape Patagonia’s climate.

The Andes mountains block moist air from the Pacific Ocean, creating a dry area on the Argentine side. The winds from the west bring this dry air, making much of Patagonia arid. South of 52^oS, the mountains are lower, allowing more moisture and forests to grow on the Atlantic coast.

Patagonia lies between high pressure to the north and low pressure to the south, so it gets strong westerly winds. In winter, more rain falls, while in summer, there is less. Cold fronts usually move from west to east, bringing cooler weather, but they are not very cold because the ocean around Patagonia moderates the temperature. Sometimes, very cold air comes from Antarctica, bringing much colder weather.