Southern Oregon Weather. 2009' finished the year as the fourth driest calender year on record for Medford Oregon since 1928. Unfortunately, that means less water in rivers and streams, which may spell disaster for fire season in the summer months. Perhaps El Nino isn't finished with Southern Oregon yet. Here are the five driest calendar years in Southern Oregon since 1928, and the five wettest years in Southern Oregon, based on data collected by the National Weather Service. Average annual rainfall is 18.37 inches for the 30 years from 1971 to 2000. Driest Years in Medford, Oregon 1959 - 10.42 inches 1985 - 10.69 inches 1933 - 11.09 inches 2009 - 11.27 inches 1930 - 11.67 inches Wettest Years in Medford, Oregon 1996 - 31.41 inches 1983 - 30.15 inches 1964 - 29.98 inches 1956 - 28...
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