St. Lawrence County Climate
St. Lawrence County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.2°F
Annual Precip
39.3"
Annual Snowfall
81.6"
Extreme Heat Days
5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,220
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: St. Lawrence County
Climate Verdict
St. Lawrence County has a cool, averaging 44.2°F annually, moderate rainfall of 39.3 inches per year, rare extreme heat with only 4.514285714285714 days above 90°F annually, heavy winter snowfall averaging 81.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 16.5°F. summers are pleasantly cool with July averaging 69.0°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
St. Lawrence County is 3.4°F cooler than the New York statewide average of 47.5°F, it is somewhat drier than average for New York.
Climate Profile
About St. Lawrence County Weather
Frigid Winters and Significant Snow
St. Lawrence County is one of the coldest in the nation with a 44.2°F annual average. Its 81.6 inches of annual snowfall is massive compared to national medians.
A Cold Leader in New York
At 44.2°F, the county is much colder than the state average of 47.4°F. It is also drier than the state average, receiving 39.3 inches of total precipitation.
Dominating the North in Snowfall
St. Lawrence receives 81.6 inches of snow, far exceeding the 50-60 inches seen in more southern counties like Steuben or Saratoga. It is also significantly colder than any neighbor in this group.
Deep Winter and Brief Summers
Winter is intense, averaging 19.7°F with January dipping to 16.5°F. Summers are short but mild, averaging 67.0°F with only 5 days of extreme heat.
Serious Equipment for Heavy Snow
Heavy-duty snowblowers are essential for the 81.6 inches of annual snow. Home insulation must be rated for extreme cold to handle the 16.5°F average in January.
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.