Lewis County Climate
Lewis County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
42.3°F
Annual Precip
49.3"
Annual Snowfall
185.9"
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
1,848
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lewis County
Climate Verdict
Lewis County has a cool, averaging 42.3°F annually, moderately wet with 49.3 inches of annual precipitation, rare extreme heat with only 1.25 days above 90°F annually, heavy winter snowfall averaging 185.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 15.7°F. summers are pleasantly cool with July averaging 66.6°F. Residents experience a substantial 51°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Lewis County is 5.2°F cooler than the New York statewide average of 47.5°F, it is also noticeably wetter, receiving 6.0 inches more precipitation than the state average.
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 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.