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The West North Central states form one of the nine geographic subdivisions within the United States that are officially recognized by the U.S. Census Bureau.. Seven states compose the division: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota and South Dakota and it makes up the western half of the United States Census Bureau's larger region of the Midwest, the eastern half of which ...
East of the Cascades, in non-mountain settings, the annual totals range from 15 to 75 inches (38 to 191 cm), depending on location; they are smallest in the north-central region and the Snake River basin in the southeast and largest in the northeastern valleys and in the high plateaus of the south-central part of the state. [3]
The region from the southern Plains, to the lower Midwest, eastward to parts of the Upper South, and the central East Coast (the New York City/coastal Connecticut region southward to Virginia) has a humid temperate climate, transitional between the humid continental and humid subtropical climate zones, becoming semi-arid in the western plains.
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [89]
The Intermountain West has a basin and range and plateau topography. Some of the region's rivers reach the Pacific Ocean, such as the Columbia River and Colorado River. Other regional rivers and streams are in endorheic basins and cannot reach the sea, such as the Walker River and Owens River. These flow into brackish or seasonally dry lakes or ...
The climate of the West is semi-arid, yet parts of the region get high amounts of rain or snow. Other parts are true desert which receive less than 5 inches (130 mm) of rain per year. The climate is increasingly unstable, and subject to periods of severe drought. [28] The seasonal temperatures vary greatly throughout the West.
This climate is rare and is predominantly found in climate fringes and isolated areas of the Cascades and Andes Mountains, as the dry-summer climate extends further poleward in the Americas than elsewhere. [10] Rare instances of this climate can be found in some coastal locations in the North Atlantic and at high altitudes in Hawaii.
The Mediterranean climate regime resembles the climate of the lands in the Mediterranean Basin, parts of lower West Coast of the United States, parts of Western and South Australia, in southwestern South Africa and in parts of central Chile. The climate is characterized by hot dry summers and cooler winters with rainfall. [31]