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St. Lawrence County Climate

St. Lawrence County, New York

JanFebMarAprMayJunJulAugSepOctNovDec44.2°AVG °F

Avg Annual Temp

44.2°F

Annual Precip

39.3"

Annual Snowfall

81.6"

Extreme Heat Days

4.514285714285714

days >= 90°F/yr

Monthly Temperature

54.4°F avgJFMAMJJASOND

Precipitation Calendar

Dry
Wet❄= snowfall
❄2.6"
❄2.1"
❄2.4"
❄3.1"
❄3.4"
4.0"
4.0"
3.5"
4.0"
❄4.2"
❄3.2"
❄2.9"
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Seasonal Overview

Comfort ZoneSpring28°56°9.0"Summer65°69°11.5"Fall36°60°11.3"Winter16°24°7.5"20°40°60°80°100°

National Comparison

Warmer than 10% of US counties
Wetter than 43% of US counties
More seasonal variation than 82% of US counties

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

What is the average temperature in St. Lawrence County?
The average annual temperature in St. Lawrence County, NY is 44.2°F, based on NOAA 30-year climate normals (1991-2020).
How much rain does St. Lawrence County get?
St. Lawrence County receives an average of 39.3 inches of precipitation per year, including both rain and meltwater from snow. This is based on NOAA 30-year climate normals.
Does it snow in St. Lawrence County?
Yes, St. Lawrence County receives an average of 81.6 inches of snowfall per year according to NOAA climate normals.
How hot does St. Lawrence County get in summer?
The average summer temperature (June-August) in St. Lawrence County is 67.0°F. The county experiences an average of 4.514285714285714 days per year above 90°F.
How cold are winters in St. Lawrence County?
The average winter temperature (December-February) in St. Lawrence County is 19.7°F. January, typically the coldest month, averages 16.5°F.

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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.

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