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Oregon rainfall varies widely from region to region. Precipitation in the state varies widely: some western coastal slopes approach 200 inches (5,100 mm) annually, while the driest places, such as the Alvord Desert (in the rain shadow of Steens Mountain) in eastern Oregon, get as little as 5 inches (130 mm). [2] [3]
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]
Bend, the region's largest city, only receives 12 inches (300 mm) of precipitation per year. Burns receives roughly 11 inches (280 mm) of precipitation annually, while Rome, in central Malheur County, and the official weather station at Whitehorse Ranch in southern Harney County receive only 8 inches (200 mm) in an average year. Some of the ...
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A total of three of the systems have hit Oregon since Dec. 1, bringing around 5 inches of rainfall in the Willamette Valley and over 6 inches on the Oregon Coast.
The most rainfall in one month was 26.99 inches (686 mm) in November 1973. The greatest 24-hour rainfall was 6.25 inches (159 mm) on November 19, 1996. While snow is common during the winter in the mountains surrounding Powers, the city itself averages only 2.5 inches (6.4 cm) of snow each year.
The higher rainfall totals come from longer-term NOAA forecasts across seven days. Bryant said Oregon said totals as high as 4 to 5 in the valley and 10 to 15 in the mountains was possible, but ...
Despite winter temperatures being above freezing on an average 72 of 89 afternoons – and minima above 32 °F (0 °C) on 31 mornings during a typical winter – precipitation is so heavy that snow cover in an average January reaches 9 inches (0.23 m), whilst the record seasonal snowfall is 323.50 inches (8.22 m) between July 1998 and June 1999.