Ontario County Climate
Ontario County, New York
Avg Annual Temp
48.0°F
Annual Precip
35.7"
Annual Snowfall
55.7"
Extreme Heat Days
7.475
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.