When the berry was introduced in the 1950s, it was widely hailed as the most delicious blackberry commercial cultivar around. Conversely, at the northern end of the valley, Portland is 50 feet (15 m) above sea level and receives only 36 inches per year. Although night frosts are common, the temperature almost always rises above the freezing point in the daytime. Very cold temperatures are atypical; the temperature very rarely falls below 20 °F (−7 °C), and readings of 5 °F (−15 °C) or lower occur only about once every 25 years. Notable floods include the Historically, the Willamette Valley forests were mostly an Human habitation in the Willamette Valley is estimated to have begun between 6,000 and 10,000 years ago.The Willamette Valley was connected to California's valley in the Pacific Northwest region of the United StatesThis article is about the geographic feature. The valley is synonymous with the cultural and political heart of Oregon, and is home to approximately 70 percent of its populationThe valley's numerous waterways, particularly the Willamette River, are vital to the economy of Oregon, as they continuously deposit highly fertile Today the valley is often considered synonymous with "Oregon Wine Country", as it contains more than 19,000 acres (7,700 ha) of vineyards and Much of the Willamette's fertility is derived from a series of massive ice-age floods that came from Geologists have come to refer to the resulting lake as The valley may be loosely defined as the broad plain of the Willamette, bounded on the west by the Oregon Coast Range and on the east by the Cascade Range. It is bounded on the south by the Calapooya Mountains, which separate the headwaters of the Willamette from the Because of differing cultural and political interests, the Cities in the valley include, from south to north, Winters are consistently wet and cloudy, and often foggy, but quite mild. Eugene, at the southern end of the valley, is 425 feet (130 m) above sea level and receives 46 inches per year. Even today, people rave over its tart-yet-sweet flavor — think of a cross between raspberries and blackberries.
For other uses, see The Willamette Valley contains most of Oregon's population; it extends from Newberg in the north to Eugene in the south. Sometimes, heat waves can occur, with temperatures rising above 90 °F (32 °C) and occasionally even reaching 100 °F (38 °C), but the nights usually bring relief. The Willamette River flows the entire length of the valley, and it is surrounded by mountains on three sides – the Cascade Range to the east, the Oregon Coast Range to the west, and the Calapooya Mountains to the south. )The Willamette Valley is prone to periodic floods. Most rainfall occurs from October to May, and it tends to be heaviest between November and January, when disturbances coming from the Severe storms of any kind are rare, although snow and ice storms can sometimes occur when surface low pressure systems move south along the coast, inducing offshore flow which advects cold air from the The agricultural richness of the valley is partly due to the In the cool moist climate of the Willamette valley, over 170 different crop and livestock items are produced, including grass and legume seeds, tree fruits and nuts, wine grapes, berries, vegetables, nursery, Christmas trees, and field crops such as wheat, oats, mint and hops, hay, livestock and poultry and miscellaneous field crops. Snow occurs on occasion, but accumulations are normally light, and in some winters no snow whatsoever falls. The valley also produces most of the cool-season forage and turf grassIn recent decades, the valley has also become a major The Marionberry, a cross between Chehalem and Olallie blackberries, was bred at Oregon State University as part of a berry-developing partnership with the U.S. Department of Agriculture that dates back to the early 1900s. (Though there is some raspberry in its DNA, the red fruits are more like a genetic great-great grandparent to the marionberry. It's named for Marion County in the Willamette Valley, where most of the field trials took place (not for former D.C. Mayor Marion Barry). The Willamette Valley is a 150-mile long valley in Oregon, in the Pacific Northwest region of the United States. Annual totals range from 36 inches (910 mm) at the lowest elevations to more than 80 inches (2,000 mm) in the foothills.
Precipitation varies considerably across the valley and is closely correlated with elevation. Summers are characterized by warm, sunny afternoons with little or no humidity, and cool evenings.
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