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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 heaviest snowfalls in Oregon occur in the Cascade Range.. Snowfall in Oregon is greatest in the Cascade Range. Based on data from ski resorts and a few official weather stations, average annual snowfall in the Cascades can range from 300 to 550 inches (760 to 1,400 cm). [3]
Although it is not arid or semi-arid, total precipitation is still low, at 13.41 inches (340.6 mm) per year, due to Klamath Falls being in the rain shadow of the Cascade Mountains to the west. The wettest "rain year" has been from July 1955 to June 1956 with 21.78 inches (553.2 mm) and the driest from July 1954 to June 1955 with 6.09 inches ...
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 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 ...
On average, precipitation falls in Ashland on 114 days each year and totals about 20 inches (510 mm). [32] The average annual snowfall is only 1.4 inches or 0.04 metres. [ 32 ] The average relative humidity, measured at 4 p.m. daily, is 47 percent in Medford, varying from 26 percent in July to 76 percent in December. [ 33 ]
Beginning Jan. 1 through this Thursday, Sept. 14, Portland has seen 40.62 inches of rainfall and melted snow. The 30-year rainfall average in Portland for that same time period, Becker explained ...
Average annual rainfall is 60.74 inches (1,543 mm) and there are an average of 138 days with measurable precipitation. The wettest year was 1996 with 95.35 inches (2,422 mm) and the driest year was 1976 with 31.69 inches (805 mm). The most rainfall in one month was 26.99 inches (686 mm) in November 1973.