Oswego, NY Climate

Climate Insight: Oswego, NY

In Oswego, New York, the NOAA 1991–2020 climate normals put the annual average temperature at 49°F, ranging from a mean daily high of 56°F to a mean daily low of 41°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00306314, these numbers smooth out year-to-year noise into a working baseline for a typical month.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Oswego receives roughly 43.1 inches of precipitation each year, with 140.1 inches typically falling as snow. The frost-free season averages 190 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 22 and the first fall freeze near October 29. For energy use, 6,499 heating degree days and 587 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Oswego scores 58/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.