In Roseburg, the summers are short, warm, dry, and mostly clear and the winters are very cold, wet, and overcast. The current PRISM normals cover the period 1981-2010.. In this year, it was common for temperatures … Monthly averages Portland Longitude: -122.676, Latitude: 45.5235 Average weather Portland, OR - 97209. July is the warmest month of the year. Climate is the average of weather over time. Climate can mean the average weather for a particular region and time period taken over 30 years. The dark horizontal line represents the long-term average. Average Weather in Roseburg Oregon, United States. Hot, Humid Weather in Oregon; How often heat combines with humidity at cities in Oregon to create uncomfortably muggy weather. 10-year temperature averages for Eugene, 2010 to 2019 The average temperature in the contiguous United States reached 52.68 degrees Fahrenheit (11.49 degrees Celsius) in 2019. The temperature in July averages 23.4 °C | 74.1 °F. August is the hottest month for Oregon with an average high temperature of 81.9°, which ranks it as cooler than most states. From 1995 to 2004, Oregon experienced a below normal number of days below freezing. The first set of high and low temperatures are averages for 2010 to 2019. Location with respect to the ocean, prevailing wind and storm paths, and topography and elevation are the principal climatic control factors. Here are the average sea temperatures at Astoria, in the north. At -4.5 °C | 23.9 °F on average, January is the coldest month of the year. Oregon - Oregon - Climate: Oregon’s climates range from equable, mild, marine conditions on the coast to continental conditions of dryness and extreme temperature, in the interior. Pacific Ocean Temperatures on the Oregon Coast; Monthly and yearly averages of sea water temperature off Oregon. Oregon average temperature. Monthly: 1981-2010 normals History: 2007-2019 You can jump to a separate table for each region of the state: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon. Station Data. The ocean temperature fluctuates between 9 °C and 15 °C (48 °F and 59 °F) in the north and between 11 °C and 14 °C (52 °C and 57 °C) in the south. The normals are baseline datasets describing average monthly and annual conditions over the most recent three full decades.They are our most popular datasets. Average high and low temperatures, total snowfall and precipitation for each year since 2010. Everything else here is based on 1981 to 2010 weather. Average annual temperatures for cities, towns, parks and lakes throughout Oregon are listed below in degrees Fahrenheit and Celsius. The values in Figure 4c are from NCEI's version 2 climate division dataset. However, the number of days below freezing has been above average in recent years. 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