Callahan, CA Climate

Climate Insight: Callahan, CA

An annual average temperature of 52°F, ranging from a mean daily high of 67°F to a mean daily low of 37°F is what the NOAA 1991–2020 climate normals report for Callahan, California. July is typically the warmest month of the year, while December is the coldest. That baseline comes from station USC00041316 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Callahan receives roughly 20.8 inches of precipitation each year, with 4.4 inches typically falling as snow. The frost-free season averages 138 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 20 and the first fall freeze near October 5. For energy use, 5,006 heating degree days and 423 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Callahan scores 69/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings December-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.