Washington is part of a region known as the Pacific Northwest, a term which always includes Washington and Oregon and may or may not include some or all of the following, depending on the user's intent: Idaho, western Montana, northern California, British Columbia, and Alaska.

The high mountains of the Cascade Range run north-south, bisecting the state.

This causes Washington's prevailing winds, the Chinooks, to come from the southwest, bringing relatively warm and moist air masses and a predictably wet season.

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Despite western Washington's having a marine climate similar to those of many coastal cities of Europe, there are exceptions such as the "Big Snow" events of 1880, 1881, 18 and the "deep freeze" winters of 1883–84, 1915–16, 1949––56, among others.

During these events western Washington experienced up to 6 feet (1.8 m) of snow, sub-zero (−18 °C) temperatures, three months with snow on the ground, and lakes and rivers frozen over for weeks.

Washington has over 1,000 dams, including the Grand Coulee Dam, built for a variety of purposes including irrigation, power, flood control, and water storage.

Washington was named after President George Washington by an act of the United States Congress during the creation of Washington Territory in 1853.

As described above, Washington's climate varies greatly from west to east.

An oceanic climate (also called "west coast marine climate") predominates in western Washington, and a much drier semi-arid climate prevails east of the Cascade Range.

It was admitted to the Union as the 42nd state in 1889. Washington is sometimes referred to as Washington State to distinguish it from Washington, D.

C., the capital of the United States, which is often shortened to Washington.

The remainder of the state consists of: deep temperate rainforests in the west; mountain ranges in the west, central, northeast and far southeast; and a semi-arid basin region in the east, central, and south, given over to intensive agriculture.