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Weather & Climate in Mattawa, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mattawa has a cool climate with an average annual temperature of 39°F (4°C). Winters average 9°F in January while summers reach 65°F in July. The area gets 271 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 35.8 inches. The area receives 11.9 inches of snow annually. The city sits at an elevation of 535 feet.
Temperature
9°F Jan (-13°C)
65°F Jul (18°C)
| Annual Average | 38.8°F |
| 28% below US avg | |
| January Average | 9°F (-13°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 535 ft (163 m) |
| Area | 77.3 sq mi (200.1 km²) |
| Population Density | 2/sq mi |
| Coordinates | 46.3168°N, 78.6996°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Jan 1, 2000 | 17 km NNE of Notre-Dame-du-Lac, Canada | M4.7 | 66 km | 18 km |
| Mar 6, 1991 | 49 km NNW of Fort-Coulonge, Canada | M3.9 | 140 km | 18 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 124 km | 18 km |
| Oct 10, 1995 | southern Quebec, Canada | M3.5 | 13 km | 18 km |
| May 14, 2016 | 8 km NW of Petawawa, Canada | M3.5 | 111 km | 18 km |
| Mar 29, 2011 | 66 km NE of Deep River, Canada | M3.5 | 136 km | 18 km |
| May 2, 2015 | 12 km NE of Notre-Dame-du-Lac, Canada | M3.3 | 59 km | 18 km |
| Jul 4, 2005 | 45 km NNW of Fort-Coulonge, Canada | M3.3 | 140 km | 13 km |
| Oct 3, 2009 | 18 km NNE of Pembroke, Canada | M3.1 | 135 km | 18 km |
| Apr 1, 2020 | 3 km NE of Saint-Isidore, Canada | M2.9 | 134 km | 10 km |
| Jul 27, 2014 | 13 km SW of Pembroke, Canada | M2.9 | 128 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 9°F (-13°C) | 2.2 in | Coldest |
| February | 11°F (-12°C) | 2.0 in | |
| March | 22°F (-5°C) | 1.9 in | Driest |
| April | 37°F (3°C) | 2.4 in | |
| May | 51°F (11°C) | 2.8 in | |
| June | 60°F (16°C) | 3.5 in | |
| July | 65°F (18°C) | 4.1 in | Warmest, Wettest |
| August | 63°F (17°C) | 3.9 in | |
| September | 55°F (13°C) | 4.0 in | |
| October | 44°F (7°C) | 3.3 in | |
| November | 32°F (-0°C) | 3.2 in | |
| December | 17°F (-8°C) | 2.6 in |
Mattawa has a seasonal temperature swing of 56°F / from 9°F in January to 65°F in July. Total annual precipitation is 35.8 inches, with July being the wettest month (4.1") and March the driest (1.9").