Jamestown, NY Climate

Climate Insight: Jamestown, NY

Based on station USC00304207 feeding NOAA's 1991–2020 climate normals, Jamestown, New York averages 47°F a year, ranging from a mean daily high of 58°F to a mean daily low of 37°F. July is typically the warmest month of the year, while January 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 Jamestown should weigh precipitation alongside temperature: the annual average runs 45.9 inches, with 98.4 inches typically falling as snow. The frost-free season averages 158 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 8 and the first fall freeze near October 13. And on the energy front, 6,848 heating degree days and 420 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Jamestown 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 January-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.