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Weather & Climate in South Glengarry, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Glengarry has a cool climate with an average annual temperature of 42°F (6°C). Winters average 12°F in January while summers reach 69°F in July. The area gets 266 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 38.7 inches. The area receives 14.5 inches of snow annually. The city sits at an elevation of 207 feet.
Temperature
12°F Jan (-11°C)
69°F Jul (20°C)
| Annual Average | 42.2°F |
| 22% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 266 days/yr |
Geography
| Elevation | 207 ft (63 m) |
| Area | 233.6 sq mi (605.0 km²) |
| Population Density | 57/sq mi |
| Coordinates | 45.1870°N, 74.5540°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
174 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 | 106 km | 19 km |
| Apr 20, 2002 | 8 km NNW of Au Sable Forks, New York | M5.3 | 101 km | 5 km |
| Mar 14, 1996 | 7 km WNW of Saint-Adolphe-d'Howard, Canada | M4.5 | 90 km | 18 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 37 km | 18 km |
| May 24, 1997 | 6 km W of Saint-Adolphe-d'Howard, Canada | M4.2 | 89 km | 10 km |
| Oct 31, 1999 | 7 km SW of Morin-Heights, Canada | M4.2 | 76 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 55 km | 18 km |
| Aug 6, 2000 | 7 km SSW of La Minerve, Canada | M4.0 | 116 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 69 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 70 km | 11 km |
| Oct 10, 2012 | 7 km ESE of Verchères, Canada | M3.9 | 119 km | 9 km |
| Oct 7, 1990 | 21 km WNW of La Minerve, Canada | M3.9 | 135 km | 18 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 35 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 48 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 70 km | 5 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 52 km | 18 km |
| Jul 30, 1998 | 0 km ENE of Lac-Simon, Canada | M3.8 | 109 km | 10 km |
| Sep 23, 1993 | 11 km SE of La Conception, Canada | M3.8 | 98 km | 18 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 42 km | 18 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 140 km | 5 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 | 104 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: FLAT ROCK FIRE (658 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | FLAT ROCK FIRE | 658 | 80 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 12°F (-11°C) | 2.9 in | Coldest |
| February | 15°F (-10°C) | 2.6 in | |
| March | 26°F (-3°C) | 2.4 in | Driest |
| April | 41°F (5°C) | 3.2 in | |
| May | 54°F (12°C) | 3.2 in | |
| June | 64°F (18°C) | 3.7 in | Wettest |
| July | 69°F (20°C) | 3.6 in | Warmest |
| August | 67°F (19°C) | 3.5 in | |
| September | 58°F (15°C) | 3.5 in | |
| October | 47°F (8°C) | 3.4 in | |
| November | 35°F (2°C) | 3.6 in | |
| December | 20°F (-7°C) | 3.0 in |
South Glengarry has a seasonal temperature swing of 57°F / from 12°F in January to 69°F in July. Total annual precipitation is 38.7 inches, with June being the wettest month (3.7") and March the driest (2.4").