Weather & Climate in St. George, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. George has a cool climate with an average annual temperature of 45°F (7°C). Winters average 21°F in January while summers reach 69°F in July. Annual precipitation totals 35.5 inches. The area receives 9.1 inches of snow annually. The city sits at an elevation of 778 feet.
Temperature
21°F Jan (-6°C)
69°F Jul (21°C)
| Annual Average | 45.4°F |
| 16% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 69°F (21°C) |
Geography
| Elevation | 778 ft (237 m) |
| Area | 51.1 sq mi (132.3 km²) |
| Population Density | 64/sq mi |
| Coordinates | 43.2450°N, 80.2514°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Nov 26, 1999 | 14 km ESE of Centennial Scarborough, Canada | M3.8 | 114 km | 13 km |
| Feb 6, 2023 | 1 km NE of West Seneca, New York | M3.8 | 127 km | 6 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 112 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 118 km | 5 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 119 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 110 km | 6 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 79 km | 7 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 138 km | 6 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 130 km | 8 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 68 km | 4 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 136 km | 5 km |
| Dec 17, 1990 | 5 km SSE of Middleboro, Pennsylvania | M2.5 | 144 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: 2.7 m (9 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1823 | LAKE ERIE | Unknown | 2.7 m | - | 123 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 2.1 in | Coldest |
| February | 22°F (-6°C) | 2.0 in | Driest |
| March | 31°F (-1°C) | 2.3 in | |
| April | 43°F (6°C) | 2.8 in | |
| May | 55°F (13°C) | 3.2 in | |
| June | 64°F (18°C) | 3.0 in | |
| July | 69°F (21°C) | 4.0 in | Warmest, Wettest |
| August | 67°F (20°C) | 3.5 in | |
| September | 60°F (16°C) | 3.5 in | |
| October | 49°F (9°C) | 2.9 in | |
| November | 38°F (3°C) | 3.5 in | |
| December | 27°F (-3°C) | 2.7 in |
St. George has a seasonal temperature swing of 48°F / from 21°F in January to 69°F in July. Total annual precipitation is 35.5 inches, with July being the wettest month (4.0") and February the driest (2.0").