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The United States of America covers a large region, stretching from east to west across nine time zones. It's therefore no surprise that the country has a varied climate, ranging from arctic regions to deserts.
California, on the West Coast of the US, has a pleasant, Mediterranean climate, while the Pacific Northwest has more of a maritime climate, with cooler summers and mild winters influenced by westerly winds.
The central part of the US has extreme temperature variations and a continental climate, with cold winters and hot summers. The eastern central US tends to be more humid, while the western central US is semi-arid.
The east side of the country has a continental climate caused by air masses moving from west to east, with hot summers and a prevalence of tornadoes in the Mississippi River area. Florida has the warmest winters on the eastern seaboard.