The climate of the United States varies greatly, due to large
differences in latitude, and a wide range of geographic features,
including mountains and deserts. West of the 100th meridian, much of the
US is semi-arid to arid, including desert in the far southwestern US.
East of the 100th meridian, the climate is humid continental in the
northern areas (locations above 40° north latitude), to humid temperate
in the central and middle Atlantic coast regions, to humid subtropical
in the Gulf and south Atlantic regions. The southern tip of Florida is tropical. Higher-elevation areas of the Rocky Mountains, the Wasatch and Bighorn mountain ranges, the Sierra Nevada and Cascade Range are alpine. The climate along the coast of California is Mediterranean, while upper West Coast areas in coastal Oregon and Washington are cool temperate oceanic. The state of Alaska,
on the northwestern corner of the North American continent, is largely
subarctic, but with a cool oceanic climate in the southeast (Alaska Panhandle), southwestern peninsula and Aleutian Islands, and a polar climate in the north. The archipelago state of Hawaii, in the middle of the Pacific Ocean, is tropical, with rainfall concentrated in the cooler season (November to March).
美国的气候变化多样，因为美国国土面积广阔，多山也有很多沙漠。
