Oswego County Climate
Oswego County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.0°F
Annual Precip
45.2"
Annual Snowfall
140.1"
Extreme Heat Days
5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
2,544
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Oswego County
Climate Verdict
Oswego County has a cool, averaging 48.0°F annually, moderately wet with 45.2 inches of annual precipitation, rare extreme heat with only 4.6 days above 90°F annually, heavy winter snowfall averaging 140.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.1°F. summers are warm — July averages 70.8°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Oswego County closely matches the New York statewide average temperature of 47.5°F.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.