Lewis County Climate
Lewis County, New York
Avg Annual Temp
42.3°F
Annual Precip
49.3"
Annual Snowfall
185.9"
Extreme Heat Days
1.25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lewis County Weather
A Cold Climate with Serious Winter Teeth
Lewis County averages a chilly 42.3°F annually, which sits well below the national median for U.S. counties. This humid continental region experiences some of the most intense winter patterns in the country.
Well Below the New York Temperature Average
With an annual average of 42.3°F, the county is significantly colder than the New York state average of 47.4°F. It remains one of the state's most northern and weather-exposed territories.
The Snow King of the Region
Compared to neighboring Oneida County's 157.7 inches, Lewis County receives an even more staggering 185.9 inches of annual snowfall. It records higher precipitation than the state average, totaling 49.3 inches annually.
Extreme Snowfall Meets Mild Summers
July brings a comfortable average of 66.6°F, and the county sees only one day per year reaching 90°F. Conversely, January temperatures plummet to 15.7°F amidst nearly 186 inches of snow.
Prioritize Insulation and Snow Removal
Residents must invest in high-performance heating systems and heavy-duty snow removal equipment. The mild summers mean air conditioning is rarely a necessity, but winter-grade home sealing is essential.
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.