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Weather & Climate in Ontario, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ontario experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 26°F in January while summers reach 71°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 39.3 inches. The area receives 85.9 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 430 feet.
Temperature
26°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 48.7°F |
| 10% below US avg | |
| January Average | 26°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 430 ft (131 m) |
| Area | 4.0 sq mi (10.4 km²) |
| Population Density | 540/sq mi |
| Coordinates | 43.2180°N, 77.2806°W |
| Timezone | America/New_York |
| County | Wayne County County |
| Nearest Airport | Frederick Douglass/Greater Rochester International (ROC) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 56.3 / 100 |
| Social Vulnerability | 39.3 / 100 |
| Community Resilience | 90.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
22 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Feb 6, 2023 | 1 km NE of West Seneca, New York | M3.8 | 129 km | 6 km |
| Nov 26, 1999 | 14 km ESE of Centennial Scarborough, Canada | M3.8 | 149 km | 13 km |
| Apr 23, 2023 | New York | M3.6 | 124 km | 9 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 86 km | 18 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 96 km | 5 km |
| Feb 3, 2001 | 6 km W of Bath, New York | M3.2 | 98 km | 0 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 146 km | 5 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 128 km | 5 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 93 km | 18 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 95 km | 5 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 92 km | 5 km |
| Jun 5, 2009 | 4 km SSE of Attica, New York | M2.9 | 90 km | 5 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 107 km | 6 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 114 km | 8 km |
| Aug 11, 2007 | 4 km N of Kingston, Canada | M2.6 | 134 km | 4 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 92 km | 5 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 91 km | 5 km |
| Apr 14, 2023 | 1 km W of Adams Center, New York | M2.6 | 124 km | 6 km |
| Apr 11, 2007 | 6 km NNE of Sodus Point, New York | M2.6 | 28 km | 7 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 109 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
58 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 4 fatalities, 12 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 2, 1983 | EF3 | 54 km | 20.0 mi | 1 |
| May 2, 1983 | EF3 | 80 km | 3.0 mi | 0 |
| Jun 2, 1969 | EF3 | 53 km | 17.5 mi | 0 |
| Aug 21, 2011 | EF2 | 44 km | 7.9 mi | 0 |
| Jun 2, 1998 | EF2 | 95 km | 15.0 mi | 0 |
| Aug 28, 1990 | EF2 | 87 km | 2.5 mi | 0 |
| Sep 19, 2022 | EF1 | 77 km | 1.9 mi | 0 |
| Sep 12, 2021 | EF1 | 68 km | 0.8 mi | 0 |
| May 3, 2018 | EF1 | 57 km | 1.1 mi | 0 |
| Jul 13, 2014 | EF1 | 92 km | 3.5 mi | 0 |
| Jul 25, 2009 | EF1 | 98 km | 4.1 mi | 0 |
| Jun 21, 2007 | EF1 | 78 km | 1.5 mi | 0 |
| May 11, 2003 | EF1 | 0 km | 2.3 mi | 0 |
| Jul 28, 2002 | EF1 | 74 km | 0.1 mi | 0 |
| Jul 15, 1996 | EF1 | 28 km | 0.5 mi | 0 |
| Jun 22, 1996 | EF1 | 55 km | 3.0 mi | 0 |
| Aug 20, 1994 | EF1 | 46 km | 2.0 mi | 0 |
| Sep 3, 1993 | EF1 | 77 km | 4.2 mi | 2 |
| Aug 24, 1993 | EF1 | 92 km | 0.3 mi | 0 |
| Jun 28, 1993 | EF1 | 78 km | 2.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: DRY MARSH (1,018 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | DRY MARSH | 1,018 | 51 km |
| 1994 | MOHAWK POOL | 507 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-4°C) | 2.3 in | |
| February | 25°F (-4°C) | 2.1 in | Coldest, Driest |
| March | 34°F (1°C) | 2.2 in | |
| April | 45°F (7°C) | 3.0 in | |
| May | 56°F (14°C) | 3.0 in | |
| June | 65°F (19°C) | 3.3 in | |
| July | 71°F (22°C) | 2.7 in | Warmest |
| August | 69°F (21°C) | 3.3 in | |
| September | 61°F (16°C) | 3.5 in | |
| October | 50°F (10°C) | 3.3 in | |
| November | 40°F (5°C) | 3.7 in | Wettest |
| December | 30°F (-1°C) | 2.8 in |
Ontario has a seasonal temperature swing of 46°F / from 25°F in February to 71°F in July. Total annual precipitation is 35.1 inches, with November being the wettest month (3.7") and February the driest (2.1").