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U S A : C l i m a t e  &  W e a t h e r

Climatical changes north america

» Weather is the atmospheric conditions experienced at a particular place or time. Climate is the average weather conditions in a particular region over a period of years. Weather affects everything on earth. It shapes how the earth looks. It is necessary for food production. It influences the way we live, where we live, and even what we wear.

The vast North American continent ranges from the lush sub-tropical climate of Florida to the frozen ice and tundra of the Arctic . Within these extremes are two wealthy industrialized countries with diverse ecosystems at risk. Yet the United States and Canada are two of the largest global emitters of the greenhouse gases that contribute to a warming climate.

In this climate zone, winters are cold and summers are hot. January temperatures usually average below 0° C (32° F), while July temperatures average between 18° C (65° F) and 24° C (75° F). Summers are humid with thunderstorms that may produce hail or tornadoes. Annual precipitation averages from 500 to 1,000 mm (between 20 and 40 in). Long, hot summer days provide ideal conditions for rapid plant growth.

» Because of its multitudes location and vast size, the United States experiences a wide variety of climates. At one extreme are the tropical islands of Hawaii ; at the other, the arctic conditions of northern Alaska . The majority of Americans live between these two extremes in a group of climatic regions with unique moisture and temperature patterns. Geographers have traditionally divided the 48 contiguous United States into two broad patterns of continental climate: the humid East and the arid West. The dividing line most often used is 100 degrees west longitude, an imaginary north-south line extending through the Great Plains from Texas to North Dakota .SA climatic transition zone occurs on either side of the 100 degrees west longitude line. The eastern woodlands gradually give way to tall grass prairies, which in turn give way to steppes, where short grasses flourish. Few natural tall grass prairies exist today on the Plains. Over the past few centuries, farmers cultivated and planted most of the region with corn or wheat.

» The eastern part of the United States includes two climate types: Humid Continental and Subtropical. Humid Continental is the largest climate type in the United States . It has two subtypes: those areas with hot summers and those with warm summers. The Humid Continental climates are transitional climates between the severe Subarctic climate region in Canada and the warmer Humid Subtropical region of the southern and southeastern United States . These climates are battlegrounds between cold polar air masses surging southward and tropical air moving northward. Humid Continental climates have four distinct seasons and large variations in temperature. They are warm in summer and cold enough to sustain winter snow for some months.



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