Ontario County Climate
Ontario County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.0°F
Annual Precip
35.7"
Annual Snowfall
55.7"
Extreme Heat Days
7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,522
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Ontario County
Climate Verdict
Ontario County has a cool, averaging 48.0°F annually, moderate rainfall of 35.7 inches per year, rare extreme heat with only 7.475 days above 90°F annually, moderate snowfall of 55.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.1°F. summers are warm — July averages 70.5°F. The 45°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
Ontario County closely matches the New York statewide average temperature of 47.5°F, it is also noticeably drier, receiving 7.7 inches less precipitation than the state average.
Climate Profile
About Ontario County Weather
Temperate Living Near the Finger Lakes
Ontario County records an annual average temperature of 48.0°F, placing it well below the national median. This climate supports the region's famous agricultural and viticultural industries.
Slightly Warmer Than the State Median
At 48.0°F, the county is roughly 0.6 degrees warmer than the New York state average. It ranks as one of the more moderate climates in the upstate region.
Drier Conditions Than Central New York
Ontario’s 35.7 inches of annual precipitation is significantly lower than Onondaga’s 44.4 inches. It also enjoys much lighter snowfall, receiving about 48 inches less than its neighbors to the east.
Moderate Snow and Consistent Summers
The county experiences a manageable 55.7 inches of snow annually compared to the lake-effect belts. Summer remains mild with 7 days of extreme heat and a July average of 70.5°F.
Versatile Gear for Changing Seasons
With 35.7 inches of rain, residents should plan for consistent but not overwhelming precipitation. The 27.2°F winter average requires reliable home insulation and standard winter apparel.
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.