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Weather & Climate in Black River-Matheson, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Black River-Matheson has a cool climate with an average annual temperature of 34°F (1°C). Winters average -1°F in January while summers reach 63°F in July / a wide seasonal temperature swing of 64°F. The area gets 277 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 32.3 inches. The area receives 12.5 inches of snow annually. The city sits at an elevation of 856 feet.
Temperature
-1°F Jan (-18°C)
63°F Jul (17°C)
| Annual Average | 33.9°F |
| 37% below US avg | |
| January Average | -1°F (-18°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 277 days/yr |
Geography
| Elevation | 856 ft (261 m) |
| Area | 448.6 sq mi (1,161.9 km²) |
| Population Density | 6/sq mi |
| Coordinates | 48.5355°N, 80.4647°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.
| Jan 3, 2006 | 68 km NNW of Iroquois Falls, Canada | M3.7 | 99 km | 15 km |
| Mar 4, 2006 | 63 km E of Kapuskasing, Canada | M3.4 | 136 km | 18 km |
| Feb 1, 1999 | 58 km NNW of Iroquois Falls, Canada | M3.4 | 88 km | 18 km |
| Apr 1, 2020 | 3 km NE of Saint-Isidore, Canada | M2.9 | 150 km | 10 km |
| Jul 25, 2020 | 33 km NW of Malartic, Canada | M2.9 | 150 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | -1°F (-18°C) | 2.1 in | Coldest |
| February | 3°F (-16°C) | 1.7 in | Driest |
| March | 16°F (-9°C) | 2.0 in | |
| April | 33°F (0°C) | 1.8 in | |
| May | 48°F (9°C) | 2.7 in | |
| June | 58°F (14°C) | 3.4 in | |
| July | 63°F (17°C) | 3.6 in | Warmest |
| August | 61°F (16°C) | 3.7 in | Wettest |
| September | 52°F (11°C) | 3.7 in | |
| October | 40°F (5°C) | 2.8 in | |
| November | 26°F (-4°C) | 2.6 in | |
| December | 8°F (-13°C) | 2.4 in |
Black River-Matheson has a seasonal temperature swing of 63°F / from -1°F in January to 63°F in July. Total annual precipitation is 32.3 inches, with August being the wettest month (3.7") and February the driest (1.7").