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Weather & Climate in Chalk River, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chalk River has a cool climate with an average annual temperature of 39°F (4°C). Winters average 9°F in January while summers reach 66°F in July. The area gets 273 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 34.6 inches. The area receives 11.9 inches of snow annually. The city sits at an elevation of 522 feet.
Temperature
9°F Jan (-13°C)
66°F Jul (19°C)
| Annual Average | 39.4°F |
| 27% below US avg | |
| January Average | 9°F (-13°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 273 days/yr |
Geography
| Elevation | 522 ft (159 m) |
| Area | 19.4 sq mi (50.3 km²) |
| Population Density | 53/sq mi |
| Coordinates | 46.0168°N, 77.4495°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
51 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.1.
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 90 km | 13 km |
| Jan 1, 2000 | 17 km NNE of Notre-Dame-du-Lac, Canada | M4.7 | 149 km | 18 km |
| Jun 16, 1991 | 78 km NW of Saint-Boniface, Canada | M4.5 | 124 km | 18 km |
| Oct 12, 2003 | 63 km NNW of Saint-Boniface, Canada | M4.2 | 138 km | 18 km |
| Mar 19, 2001 | 65 km NNW of Saint-Boniface, Canada | M3.9 | 146 km | 18 km |
| Mar 6, 1991 | 49 km NNW of Fort-Coulonge, Canada | M3.9 | 53 km | 18 km |
| Sep 7, 2002 | southern Quebec, Canada | M3.7 | 137 km | 18 km |
| Feb 26, 1998 | 33 km SW of Saint-Raphaël, Canada | M3.7 | 84 km | 18 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M3.6 | 90 km | 11 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 45 km | 18 km |
| Mar 29, 2011 | 66 km NE of Deep River, Canada | M3.5 | 72 km | 18 km |
| May 14, 2016 | 8 km NW of Petawawa, Canada | M3.5 | 10 km | 18 km |
| Oct 10, 1995 | southern Quebec, Canada | M3.5 | 111 km | 18 km |
| May 28, 2002 | 11 km WNW of Shawville, Canada | M3.4 | 77 km | 18 km |
| Mar 31, 2005 | 27 km ESE of Maniwaki, Canada | M3.4 | 142 km | 18 km |
| Jun 3, 1995 | southern Quebec, Canada | M3.4 | 143 km | 18 km |
| Jan 6, 2007 | 61 km NNW of Saint-Boniface, Canada | M3.3 | 146 km | 18 km |
| Aug 27, 2021 | 55 km NW of Saint-Boniface, Canada | M3.3 | 118 km | 14 km |
| May 2, 2015 | 12 km NE of Notre-Dame-du-Lac, Canada | M3.3 | 145 km | 18 km |
| Jul 4, 2005 | 45 km NNW of Fort-Coulonge, Canada | M3.3 | 50 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 15.0 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1908 | NOTRE DAME DE LA SALETTE | Meteorological | 15.0 m | 33 | 146 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 9°F (-13°C) | 2.2 in | Coldest |
| February | 12°F (-11°C) | 1.9 in | Driest |
| March | 23°F (-5°C) | 2.3 in | |
| April | 38°F (3°C) | 2.5 in | |
| May | 52°F (11°C) | 3.3 in | |
| June | 61°F (16°C) | 3.4 in | |
| July | 66°F (19°C) | 3.4 in | Warmest |
| August | 64°F (18°C) | 3.4 in | |
| September | 56°F (13°C) | 3.5 in | Wettest |
| October | 44°F (7°C) | 3.3 in | |
| November | 32°F (0°C) | 3.0 in | |
| December | 17°F (-8°C) | 2.5 in |
Chalk River has a seasonal temperature swing of 57°F / from 9°F in January to 66°F in July. Total annual precipitation is 34.6 inches, with September being the wettest month (3.5") and February the driest (1.9").