Green Valley, AZ Climate

Climate Insight: Green Valley, AZ

Based on station USC00023668 feeding NOAA's 1991–2020 climate normals, Green Valley, Arizona averages 68°F a year, ranging from a mean daily high of 84°F to a mean daily low of 53°F. July is typically the warmest month of the year, while December is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Green Valley averages 12.8 inches of precipitation a year, with negligible snowfall, and that matters as much to daily life here as temperature does. The frost-free season averages 275 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near February 25 and the first fall freeze near November 27. As for energy demand, 1,631 heating degree days and 2,909 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Green Valley scores 87/100 (Excellent), 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, July-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.