Chester, CA Climate

Climate Insight: Chester, CA

Based on station USC00041700 feeding NOAA's 1991–2020 climate normals, Chester, California averages 48°F a year, ranging from a mean daily high of 62°F to a mean daily low of 33°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.

Anyone planning to live, garden, or travel in Chester should weigh precipitation alongside temperature: the annual average runs 34.3 inches, with 109.6 inches typically falling as snow. The frost-free season averages 123 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 28 and the first fall freeze near September 28. And on the energy front, 6,512 heating degree days and 210 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Chester scores 54/100 (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, 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.