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According to the Köppen climate classification, most of Western Oregon has a warm-summer Mediterranean climate (or Csb type), which features warm, dry summers, and wet winters with frequent overcast and cloudy skies. Eastern Oregon falls into the cold semi-arid climate (or BSk type), which features drier weather.
Willamette River. Willamette Valley basin. The Willamette Valley ( / wɪˈlæmɪt / ⓘ wil-AM-it) is a 150-mile (240 km) long valley in Oregon, in the Pacific Northwest region of the United States. The Willamette River flows the entire length of the valley and is surrounded by mountains on three sides: the Cascade Range to the east, the Oregon ...
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [ 89]
The Harney Basin of Oregon is an example of arid climate in the Pacific Northwest. Humid continental climates occur inland on windward sides, in places such as Revelstoke, British Columbia. A subarctic climate can be found farther north, especially in Yukon and Alaska. [48] The lack of rain in the hot season is associated with high atmospheric ...
The Oregon Coast Range, often called simply the Coast Range and sometimes the Pacific Coast Range, is a mountain range, in the Pacific Coast Ranges physiographic region, in the U.S. state of Oregon along the Pacific Ocean. This north-south running range extends over 200 miles (320 km) from the Columbia River in the north on the border of Oregon ...
A rain shadow is an area of significantly reduced rainfall behind a ... mostly in Oregon and ... 's 1,075 millimetres (42.3 in). In the cool season, ...
"Climate change can increase the frequency and severity of fires that burn forests, grasslands, and desert vegetation. Since 1984, about 4 percent of the land in Oregon has burned per decade. The changing climate is likely to more than double the area in the Northwest burned by forest fires during an average year by the end of the 21 st century.
The region's climate is unique among AVAs in Oregon; the average temperature is relatively cool and rainfall is low, creating a shorter growing season. Current production is led by hardy grapes such as Riesling , Gewürztraminer , and Chardonnay .
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