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Weather & Climate in South River, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South River has a cool climate with an average annual temperature of 39°F (4°C). Winters average 10°F in January while summers reach 65°F in July. The area gets 267 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 37.9 inches. The area receives 13.0 inches of snow annually. The city sits at an elevation of 1,217 feet.
Temperature
10°F Jan (-12°C)
65°F Jul (18°C)
| Annual Average | 39.1°F |
| 28% below US avg | |
| January Average | 10°F (-12°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 267 days/yr |
Geography
| Elevation | 1,217 ft (371 m) |
| Area | 1.6 sq mi (4.1 km²) |
| Population Density | 694/sq mi |
| Coordinates | 45.8334°N, 79.3829°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
7 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 | 122 km | 18 km |
| Mar 9, 1998 | Ontario, Canada | M3.9 | 149 km | 1 km |
| Mar 13, 2005 | 5 km N of Greater Sudbury, Canada | M3.6 | 146 km | 18 km |
| Oct 10, 1995 | southern Quebec, Canada | M3.5 | 81 km | 18 km |
| May 2, 2015 | 12 km NE of Notre-Dame-du-Lac, Canada | M3.3 | 116 km | 18 km |
| Jul 29, 2012 | 17 km SSW of Parry Sound, Canada | M2.5 | 90 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 93 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 10°F (-12°C) | 2.5 in | Coldest |
| February | 13°F (-11°C) | 1.9 in | Driest |
| March | 23°F (-5°C) | 2.4 in | |
| April | 38°F (3°C) | 2.5 in | |
| May | 51°F (11°C) | 3.5 in | |
| June | 59°F (15°C) | 3.3 in | |
| July | 65°F (18°C) | 3.7 in | Warmest |
| August | 63°F (17°C) | 3.6 in | |
| September | 55°F (13°C) | 4.3 in | Wettest |
| October | 44°F (6°C) | 4.0 in | |
| November | 31°F (-0°C) | 3.5 in | |
| December | 18°F (-8°C) | 2.7 in |
South River has a seasonal temperature swing of 54°F / from 10°F in January to 65°F in July. Total annual precipitation is 37.9 inches, with September being the wettest month (4.3") and February the driest (1.9").