The climate of the USA

the world, after Russia, Canada and China.

from the warm, wet conditions of the Appalachians to the semi-desert or desert conditions in some of the western states. It varies from southern Arizona and southern Florida, where almost there is no winter at all, to the territory of Montana, North Dakota and South Dakota, where there are long, very cold and severe winters. In other words, the US has practically all the climatic zones. The climatic conditions of the country are determined by the great mountains and the wind. West of the Rocky Mountains, running all the way from the Canadian border to Mexico, there are vast areas where almost no trees grow. In this section of the country there are deserts, which receive as little as 12-13 centimetres of rainfall a year. Yet, west of the Sierra Nevada Mountains, there are places in which 250 centimetres of rain fall annually.

US. For instance, all along the western coast, the temperature changes little between winter and summer. In some places, the average difference between July and January is as little as 10 degrees Centigrade. The climate along the northern part of this coast is similar to that of England. the north central part of the country the temperature difference between winter and summer is very great — 36 degrees Centigrade and even more. The coldest days of January may be — 40 degrees Centigrade, and the hottest July days may be 45 degrees.

lying in the Pacific and stretching from southeast to northwest for 2,575 kilometres.

favourable, because of the ocean currents that pass its shores and the winds that blow across the land from the northeast

state which lie above the Arctic Circle, Alaska still is a land of icebergs and polar bears. Ice masses lie buried in the earth, which is permanently frozen land to a depth of 90 or more meters.

From early May until early August, the midnight sun never sets on this flat, treeless region, but the sun cannot melt the icy soil more than two thirds of a meter down.