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Weather & Climate in South Dundas, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Dundas has a cool climate with an average annual temperature of 43°F (6°C). Winters average 14°F in January while summers reach 69°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 38.2 inches. The area receives 10.6 inches of snow annually. The city sits at an elevation of 266 feet.
Temperature
14°F Jan (-10°C)
69°F Jul (21°C)
| Annual Average | 43.2°F |
| 20% below US avg | |
| January Average | 14°F (-10°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 267 days/yr |
Geography
| Elevation | 266 ft (81 m) |
| Area | 201.4 sq mi (521.5 km²) |
| Population Density | 55/sq mi |
| Coordinates | 44.9486°N, 75.2648°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
153 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.
| Jun 23, 2010 | 29 km NNE of Val-des-Monts, Canada | M5.4 | 105 km | 19 km |
| Apr 20, 2002 | 8 km NNW of Au Sable Forks, New York | M5.3 | 133 km | 5 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 124 km | 13 km |
| Mar 14, 1996 | 7 km WNW of Saint-Adolphe-d'Howard, Canada | M4.5 | 133 km | 18 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 91 km | 18 km |
| May 24, 1997 | 6 km W of Saint-Adolphe-d'Howard, Canada | M4.2 | 132 km | 10 km |
| Oct 31, 1999 | 7 km SW of Morin-Heights, Canada | M4.2 | 125 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 72 km | 18 km |
| Aug 6, 2000 | 7 km SSW of La Minerve, Canada | M4.0 | 140 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 96 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 76 km | 11 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 96 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 94 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 73 km | 5 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 112 km | 18 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 137 km | 5 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 100 km | 18 km |
| Sep 23, 1993 | 11 km SE of La Conception, Canada | M3.8 | 134 km | 18 km |
| Nov 16, 1993 | 5 km SSE of Saint-Édouard, Canada | M3.8 | 141 km | 17 km |
| Jul 30, 1998 | 0 km ENE of Lac-Simon, Canada | M3.8 | 141 km | 10 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 | 95 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 14°F (-10°C) | 2.6 in | Coldest |
| February | 16°F (-9°C) | 2.4 in | Driest |
| March | 28°F (-2°C) | 2.4 in | |
| April | 42°F (6°C) | 3.2 in | |
| May | 55°F (13°C) | 3.1 in | |
| June | 64°F (18°C) | 3.2 in | |
| July | 69°F (21°C) | 3.7 in | Warmest |
| August | 67°F (20°C) | 3.7 in | Wettest |
| September | 58°F (15°C) | 3.7 in | |
| October | 47°F (8°C) | 3.3 in | |
| November | 36°F (2°C) | 3.6 in | |
| December | 21°F (-6°C) | 3.1 in |
South Dundas has a seasonal temperature swing of 56°F / from 14°F in January to 69°F in July. Total annual precipitation is 38.2 inches, with August being the wettest month (3.7") and February the driest (2.4").