Lebanon, OR Climate

Climate Insight: Lebanon, OR

The NOAA 1991–2020 climate normals describe Lebanon, Oregon as a location with an annual average temperature of 55°F, ranging from a mean daily high of 65°F to a mean daily low of 45°F. August is typically the warmest month of the year, while December is the coldest. These thirty-year averages, computed from station USC00354819, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Lebanon averages an uncharted amount of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 249 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 14 and the first fall freeze near November 18. As for energy demand, 4,149 heating degree days and 494 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Lebanon scores 57/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, August-driven heat at the peak of summer, and December-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.