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Weather & Climate in Ajax, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ajax experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 25°F in January while summers reach 71°F in July. The area gets 242 sunny days per year, above the national average. Annual precipitation totals 39.2 inches. The area receives 46.9 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 318 feet.
Temperature
25°F Jan (-4°C)
71°F Jul (21°C)
| Annual Average | 48.6°F |
| 10% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 242 days/yr |
Geography
| Elevation | 318 ft (97 m) |
| Area | 25.7 sq mi (66.6 km²) |
| Population Density | 4,923/sq mi |
| Coordinates | 43.8501°N, 79.0329°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
20 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 | 112 km | 6 km |
| Nov 26, 1999 | 14 km ESE of Centennial Scarborough, Canada | M3.8 | 16 km | 13 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 89 km | 18 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 7 km | 18 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 130 km | 18 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 65 km | 5 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 97 km | 5 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 15 km | 5 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 69 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 122 km | 6 km |
| Jun 5, 2009 | 4 km SSE of Attica, New York | M2.9 | 130 km | 5 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 62 km | 7 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 99 km | 6 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 56 km | 8 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 147 km | 5 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 72 km | 5 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 61 km | 4 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 59 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 136 km | 5 km |
| Feb 13, 2014 | 34 km N of Lyndonville, New York | M2.5 | 56 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: MOHAWK POOL (507 acres, 1994).
| Year | Name | Acres Burned | Distance |
| 1994 | MOHAWK POOL | 507 | 95 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.1 in | Driest |
| February | 21°F (-6°C) | 2.2 in | Coldest |
| March | 30°F (-1°C) | 2.2 in | |
| April | 42°F (6°C) | 2.9 in | |
| May | 54°F (12°C) | 3.2 in | |
| June | 63°F (17°C) | 3.0 in | |
| July | 71°F (21°C) | 2.8 in | Warmest |
| August | 67°F (20°C) | 3.5 in | |
| September | 60°F (15°C) | 3.6 in | Wettest |
| October | 48°F (9°C) | 3.1 in | |
| November | 38°F (3°C) | 3.5 in | |
| December | 26°F (-3°C) | 2.7 in |
Ajax has a seasonal temperature swing of 50°F / from 21°F in February to 71°F in July. Total annual precipitation is 34.7 inches, with September being the wettest month (3.6") and January the driest (2.1").