Corvallis is a city in central western Oregon, United States. It is the county seat of Benton County and the principal city of the Corvallis, Oregon Metropolitan Statistical Area, which encompasses all of Benton County. As of the 2010 United States Census, the population was 54,462. Its population was estimated by the Portland Research Center to be 55,298 in 2013. Corvallis is the location of Oregon State University, a large Hewlett-Packard research campus, and Good Samaritan Regional Medical Center.
Corvallis is at an elevation of 235 feet (72 m) above sea level. Situated midway in the Willamette Valley, Corvallis is about 46 miles (74 km) east of Newport and the Oregon Coast, 85 miles (137 km) south of Portland, 30 miles (48 km) south of the state capital, Salem, 10 miles (16 km) southwest of Albany, about 10 miles (16 km) west of Interstate 5 at its closest point, and 48 miles (77 km) north of Eugene/Springfield. Oregon Route 99W, a secondary north–south route, also runs through Corvallis. U.S. Route 20 (which leads to Newport) and Oregon Route 34 (which leads to Waldport about 56 miles (90 km) to the west) both secondary East-West routes run through Corvallis from the Oregon Coast. Corvallis is at river mile 131–32 of the Willamette River.
Like the rest of the Willamette Valley, Corvallis falls within the dry-summer subtropical climate zone, also referred to as cool-summer Mediterranean (Köppen Csb). Temperatures are mild year round, with warm, dry sunny summers and mild, wet winters with persistent overcast skies. Spring and fall are also moist seasons with varied cloudiness, and light rain falling for extended periods.
Winter snow is rare, but occasionally does fall, and amounts can range between a dusting and a few inches that does not persist on the ground for more than a day. The northwest hills will often experience more snow. During the mid-winter months after extended periods of rain, thick persistent fogs can form, sometimes lasting the entire day. This can severely reduce visibility to as low as 20 feet (6.1 m). The fog will often persist until a new storm system enters the area. This fog could be seen as a type of tule fog.
Rainfall total within the town itself is surprisingly variable. This is due to Corvallis lying right on the eastern edge of the Oregon Coast Range, with a small portion of the town inside of the range. Rainfall amounts can range from an average of 66.40 inches (168.7 cm) per year  in the far northwest hills, compared to 43.66 inches (110.9 cm) per year at Oregon State University which is located in the center of Corvallis.
Because of its close proximity to the coastal range, Corvallis can experience slightly cooler temperatures, particularly in the hills, than the rest of the Willamette Valley. The average annual low temperature is 4 degrees less than that of Portland just 85 miles (137 km) to the north. Despite this, temperatures dropping far below freezing are still a rare event.
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