Oswego County Climate
Oswego County, New York
Avg Annual Temp
48.0°F
Annual Precip
45.2"
Annual Snowfall
140.1"
Extreme Heat Days
4.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Oswego County Weather
Heavy Snowfall and Cooler Averages
Oswego County’s 48.0°F annual average temperature is roughly 7 degrees below the national median. The climate is defined by its proximity to Lake Ontario, leading to extreme lake-effect events.
Just Above the New York Average
Despite its reputation for harsh winters, the 48.0°F annual average is 0.6 degrees higher than the state average. This is largely due to the lake’s ability to moderate extreme cold.
New York’s Snow Leader
Oswego’s 140.1 inches of snow dwarfs neighboring Ontario’s 55.7 inches. It receives nearly triple the snowfall of Hudson Valley counties like Orange.
Extreme Snow and Rare Heat
With a massive 140.1 inches of annual snow, winter is the dominant season here. Summers are exceptionally mild, seeing only 5 days of extreme heat and a July average of 70.8°F.
Extreme Winter Readiness Required
Structural roof reinforcements and professional-grade snow equipment are essential for the 140 inches of snowfall. Heating systems must run efficiently to counter the 26.8°F winter average.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.