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Weather & Climate in Ontario, OR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ontario experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 29°F in January while summers reach 77°F in July. The area gets 293 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 10.0 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 2,175 feet.
Temperature
29°F Jan (-2°C)
77°F Jul (25°C)
| Annual Average | 51.6°F |
| 4% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 2,175 ft (663 m) |
| Area | 2.0 sq mi (5.2 km²) |
| Population Density | 1,958/sq mi |
| Coordinates | 44.0250°N, 116.9788°W |
| Timezone | America/Los_Angeles |
| County | Payette County County |
| Nearest Airport | Boise Air Trml/Gowen Field (BOI) 49 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 17.1 / 100 |
| Social Vulnerability | 15.4 / 100 |
| Community Resilience | 11.1 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
699 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.
| Feb 26, 2024 | 10 km N of Smiths Ferry, Idaho | M4.9 | 80 km | 12 km |
| Apr 1, 2020 | 21 km WNW of Stanley, Idaho | M4.8 | 148 km | 10 km |
| Jun 25, 2020 | 27 km NW of Stanley, Idaho | M4.6 | 149 km | 8 km |
| Apr 1, 2020 | 23 km NW of Stanley, Idaho | M4.4 | 149 km | 7 km |
| May 14, 2020 | 31 km NW of Stanley, Idaho | M4.4 | 147 km | 13 km |
| Apr 11, 1995 | 20 km SSE of Yellow Pine, Idaho | M4.2 | 149 km | 5 km |
| Apr 21, 2020 | 29 km NW of Stanley, Idaho | M4.1 | 150 km | 10 km |
| Apr 3, 2020 | 20 km NW of Stanley, Idaho | M4.0 | 150 km | 10 km |
| Oct 27, 1994 | 11 km SE of Halfway, Oregon | M4.0 | 88 km | 10 km |
| Apr 1, 2020 | 28 km NW of Stanley, Idaho | M3.9 | 146 km | 10 km |
| Apr 3, 2020 | 26 km NW of Stanley, Idaho | M3.9 | 147 km | 15 km |
| Jul 3, 2020 | 26 km NW of Stanley, Idaho | M3.9 | 150 km | 10 km |
| Apr 5, 2020 | 25 km NW of Stanley, Idaho | M3.8 | 147 km | 9 km |
| Jun 27, 2020 | 17 km SW of Stanley, Idaho | M3.8 | 150 km | 10 km |
| Oct 4, 2002 | 15 km W of Cascade, Idaho | M3.8 | 80 km | 5 km |
| Jul 3, 2020 | 27 km NW of Stanley, Idaho | M3.8 | 149 km | 10 km |
| Mar 12, 2023 | 11 km S of Donnelly, Idaho | M3.7 | 98 km | 12 km |
| Apr 27, 2020 | southern Idaho | M3.7 | 150 km | 10 km |
| Apr 6, 1995 | 11 km N of Smiths Ferry, Idaho | M3.7 | 82 km | 5 km |
| Apr 25, 2020 | 35 km NW of Stanley, Idaho | M3.7 | 148 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
37 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1.
| Date | Rating | Distance | Path | Fatalities |
| Apr 30, 1997 | EF1 | 16 km | 3.0 mi | 0 |
| May 17, 1996 | EF1 | 28 km | 0.3 mi | 0 |
| May 17, 1996 | EF1 | 25 km | 5.5 mi | 0 |
| Jun 19, 1991 | EF1 | 42 km | 0.1 mi | 0 |
| Jul 9, 1990 | EF1 | 34 km | 0.1 mi | 0 |
| Oct 26, 1984 | EF1 | 70 km | 0.3 mi | 0 |
| Mar 21, 1984 | EF1 | 78 km | 0.1 mi | 0 |
| Jul 1, 1983 | EF1 | 10 km | 2.0 mi | 0 |
| Apr 23, 1974 | EF1 | 30 km | 1.0 mi | 0 |
| Aug 25, 1966 | EF1 | 30 km | 19.1 mi | 0 |
| Jun 27, 1958 | EF1 | 89 km | 5.0 mi | 0 |
| Jul 9, 1956 | EF1 | 53 km | 0.1 mi | 0 |
| May 26, 2023 | EF0 | 54 km | 1.0 mi | 0 |
| May 27, 2022 | EF0 | 71 km | 3.8 mi | 0 |
| Aug 25, 2004 | EF0 | 41 km | - | 0 |
| Aug 25, 2004 | EF0 | 30 km | - | 0 |
| Apr 6, 2003 | EF0 | 59 km | 1.0 mi | 0 |
| Sep 29, 2002 | EF0 | 35 km | 1.0 mi | 0 |
| Feb 7, 2002 | EF0 | 42 km | 0.1 mi | 0 |
| Sep 13, 2001 | EF0 | 25 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Jordan Craters (105 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Jordan Craters | Volcanic field | 1,473 m (4,833 ft) | -1250 | 105 km |
| Diamond Craters | Volcanic field | 1,435 m (4,708 ft) | -5610 | 176 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: SODA (282,888 acres, 2015).
| Year | Name | Acres Burned | Distance |
| 2015 | SODA | 282,888 | 79 km |
| 2024 | PADDOCK | 186,842 | 40 km |
| 2024 | COW VALLEY | 134,642 | 53 km |
| 2015 | CORNET-WINDY RIDGE | 102,553 | 87 km |
| 2020 | WOODHEAD | 98,995 | 82 km |
| 2000 | JACKSON | 80,733 | 22 km |
| 2006 | CHERRY | 56,773 | 48 km |
| 2006 | FOSTER GULCH | 52,496 | 98 km |
| 2015 | BENDIRE COMPLEX | 49,260 | 77 km |
| 2006 | RATTLESNAKE COMPLEX | 48,330 | 100 km |
| 2013 | OWYHEE | 48,001 | 47 km |
| 2007 | IRISH SPRING | 47,845 | 91 km |
| 2020 | INDIAN CREEK | 46,275 | 75 km |
| 2006 | STAR MOUNTAIN | 45,243 | 98 km |
| 2002 | TRIMBLY CREEK | 43,085 | 63 km |
| 1986 | BISSELL CK | 40,847 | 29 km |
| 1986 | VAN DUSEN | 39,901 | 43 km |
| 2022 | WILLOW CREEK | 38,585 | 28 km |
| 2016 | CHERRY ROAD | 35,219 | 55 km |
| 2018 | MESA | 34,541 | 87 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.7 in | Coldest |
| February | 34°F (1°C) | 1.3 in | |
| March | 43°F (6°C) | 1.2 in | |
| April | 50°F (10°C) | 0.8 in | |
| May | 59°F (15°C) | 1.0 in | |
| June | 67°F (19°C) | 0.8 in | |
| July | 77°F (25°C) | 0.3 in | Warmest, Driest |
| August | 73°F (23°C) | 0.4 in | |
| September | 63°F (17°C) | 0.5 in | |
| October | 51°F (11°C) | 0.8 in | |
| November | 39°F (4°C) | 1.5 in | |
| December | 29°F (-2°C) | 1.7 in | Wettest |
Ontario has a seasonal temperature swing of 48°F / from 29°F in January to 77°F in July. Total annual precipitation is 12.0 inches, with December being the wettest month (1.7") and July the driest (0.3").