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. 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) |
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").