Gr6 SS Learn 2.3 Climate Zones of North America

Geography of North America

Climate Zones

Climate and vegetation zones are essential to the geography of North America as they determine the continent's diverse ecosystems, agricultural potential, and human settlement patterns. They influence weather, natural resources, and biodiversity, shaping the way people live and interact with the environment.

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Climate Zone

Climate Zone

The Temperate Deciduous Forest Zone

The Temperate Deciduous Forest climate zone covers much of the eastern United States, parts of the Pacific Northwest, and southern Canada. It's one of the most livable and diverse regions in North America. In the Temperate Deciduous Forest:

• There are four distinct seasons: cold winters, warm summers, and mild spring and fall.
• Rain falls fairly evenly throughout the year, supporting a variety of plant life.
• Temperatures range from below freezing in winter to warm and humid in summer.
• This region is home to deciduous forests, where trees like oak, maple, and hickory lose their leaves each fall.
• There are also shrubs, wildflowers, and grasses.
• The fertile soil and balanced climate make this area good for farming and supporting lots of wildlife.

Climate Zone

The Temperate Grassland Zone

The Temperate Grassland zone is found in the heart of North America. In the United States, it's known as the Great Plains, stretching from Texas to the Dakotas. It also extends into parts of southern Canada, like Alberta, Saskatchewan, and Manitoba. In the Temperate Grassland:

• There are hot summers and cold winters.
• There’s moderate rainfall, enough for grasses to grow, but usually not enough for forests.
• Strong winds and occasional droughts are common.
• The natural vegetation is mostly grasses—both tallgrass (in wetter areas) and shortgrass (in drier areas).
• Few trees grow here, except near rivers or where people have planted them.

Climate Zone

The Subtropical Mixed Forest Zone

The Subtropical Mixed Forest climate zone is found in the southeastern United States and along the Pacific coast, including states like California, Florida, Georgia, Alabama, Mississippi, Louisiana, and parts of Texas. It’s warm, humid, and supports lush plant life. In the Subtropical Mixed Forest Zone:

• It is hot and humid in the summer and mild in the winter.
• It gets plenty of rainfall, often from thunderstorms and even hurricanes.
• Snow is rare, but the region still experiences seasonal changes.
• There is a mix of forests and grasslands. You’ll find broadleaf evergreen trees, pine forests, palms, and wetland plants like cypress in swampy areas.
• The warm, wet climate supports rich biodiversity, including crops like cotton, citrus, and sugarcane.

Climate Zone

The Desert Zone

The desert climate zone in North America is found mostly in the southwestern United States and northern Mexico. In the Desert Zone:

• It is very hot summers, especially in low-elevation areas. There are mild winters, with very little frost or snow.
• It is extremely dry. These regions get less than 10 inches of rain per year. Rain is often unpredictable and comes in short bursts which may cause flash floods.
• Plants must survive with very little water, intense sun, and extreme heat. Many have deep roots, waxy coatings, or can store water inside their stems or leaves.
• Common desert plants incude cacti, creosote bush, agave, yucca, mesquite trees, ocotillo, prickly pear, and other drought-tolerant shrubs.

Climate Zone

The Subarctic Taiga Zone

The Subarctic climate zone is found just south of the Polar region. In North America, it stretches across much of central and southern Alaska and a large part of Canada, including areas like Yukon, British Columbia, Alberta, and parts of Quebec. In the Subarctic Taiga:

• It is cold for most of the year, but not as extreme as the Polar zone.
• Winters are long and bitterly cold, with lots of snow and short days.
• Summers are short but warmer, with enough sunlight and warmth to support more plant life.
• Unlike the tundra, trees can grow—mostly tough evergreens like spruce, fir, and pine.
• The ground may still have permafrost in places, but there's a short growing season that supports forests and wildlife.

Climate Zone

The Semiarid Steppe Zone

The Semiarid Steppe climate zone is found in the northern and central parts of Mexico. These areas are dry but not as extreme as desert regions. In the Semiarid Steppe:

• It is hot, dry summers and cool winters.
• Rainfall is low and irregular, mostly coming during short rainy seasons.
• Droughts are common, and the land can go long periods without water.
• The vegetation includes scrubland, grasses, cacti, and hardy desert shrubs. You’ll also find mesquite trees, agave, and thorny bushes.
• Plants are adapted to dry conditions—many store water or have deep roots to survive long dry spells.

Climate Zone

The Highland Zone

The highland climate zone is found in mountainous regions where the elevation (height above sea level) affects the temperature and vegetation. In North America, this includes areas like the Rocky Mountains, the Sierra Nevada (California and Nevada), Cascade Range, and the Sierra Madre in Mexico. In the Higland zone:

• Climate changes with elevation: the higher you go, the colder it gets.
• Lower elevations may be warm and forested, while higher elevations can be cold, even snowy year-round.
• Weather is unpredictable—you might get sun, rain, and snow all in the same day.
• Vegetation depends elevation. In lower slopes there are forests. At mid-elevations there are meadows with grasses and wildflowers. At high elevations there is alpine tundra with low shrubs, mosses, and lichens—no trees grow above the “tree line.”
• Plants here are adapted to cold, wind, and thin air.

Climate Zone

The Polar Tundra Zone

The Polar Tundra climate zone is the coldest region on Earth. In North America, it's found in northern Alaska and northern Canada, including places like Nunavut and Arctic Archipelago. In the Polar Tundra:

• It is extremely cold most of the year, with temperatures often far below freezing.
• Winters are long and dark, with very little sunlight—sometimes none at all for weeks.
• Summers are short and cool, but the sun stays up for nearly 24 hours during this time.
• The ground is often covered in snow, and permafrost (permanently frozen soil) keeps it frozen even in summer.

• Trees can’t grow in the tundra because of the frozen ground and harsh climate.
• Only small, hardy plants like mosses, grasses, and lichens can survive. These hardy plants have adapted to survive the freezing temperatures and limited growing season.

Climate Zone

The Tropical Grassland Zone

The Tropical Grassland climate zone is found in parts of Central America, especially in areas with flat plains between mountains or near coasts, like parts of Honduras, Nicaragua, and eastern Guatemala. These areas are warm all year, but have distinct wet and dry seasons. The land is mostly open with scattered trees and tall grasses. In the Tropical Grassland Zone:

• The weather is warm year-round.
• There are two seasons: a wet season with heavy rain and a dry season with little rainfall.
• Grasses grow tall during the wet season, but dry out in the dry season.
• Scattered trees like acacia and palms can survive the dry months.
• Fires and droughts are common during dry periods, and many plants are adapted to regrow quickly.
• These regions are used for ranching, grazing cattle, and some seasonal farming.