St. Marys, ON

Full City Profile · Ontario

2.8 /5.0

C+ Fair

7,386 Population 1,538/sq mi density

$86,000 Median Income $49,720 per capita

$500,000 Home Value

$970 Median Rent 12.0% income on rent

48°F Avg Temperature 224 sunny days/yr

C+

Overall

2.8 / 5.0

Fair overall score based on economy, affordability, safety and education

Economy

3.4 / 5.0

$86,000 median income, 10.1% unemployment

Affordability

3.4 / 5.0

$500,000 home value, $970/mo rent

C+

Safety

2.5 / 5.0

Education

2.0 / 5.0

12.8% bachelor's degree or higher

St. Marys experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 30°F in January while summers reach 69°F in July. The area gets 224 sunny days per year. Annual precipitation totals 40.6 inches. The area receives 48.4 inches of snow annually.

Temperature

30°F Jan (-1°C) 69°F Jul (20°C)

Annual Average	48.1°F
	11% below US avg
January Average	30°F (-1°C)
July Average	69°F (20°C)
Sunny Days	224 days/yr

Geography

Elevation	1,070 ft (326 m)
Area	4.8 sq mi (12.4 km²)
Population Density	1,538/sq mi
Coordinates	43.2501°N, 81.1330°W
Timezone	America/Toronto

Precipitation & Snow

Annual Rainfall 40.6"

7% above US avg

Snowfall 48.4"

Wettest Month (Sep) 4.09"

Driest Month (Feb) 2.60"

Air Quality

Earthquake History

5 earthquakes (M2.5+) within 150 km since 1990. Strongest: M3.9. Most recent: M2.5 on May 23, 2022.

Jan 26, 2001	8 km NNW of Edgewood, Ohio	M3.9	148 km
Mar 15, 1992	15 km NW of North Perry, Ohio	M3.5	149 km
Mar 28, 2005	16 km NW of Virgil, Canada	M2.8	150 km
Sep 20, 2009	20 km ESE of Oakville, Canada	M2.6	138 km
May 23, 2022	2 km NNW of Corunna, Canada	M2.5	114 km

Source: USGS (M2.5+, 1990-2025)

Tsunami History

2 tsunamis 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	-	107 km
1952	LAKE HURON, MI	Avalanche	1.5 m	-	104 km

Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	30°F (-1°C)	3.2 in
February	21°F (-6°C)	2.6 in	Coldest, Driest
March	30°F (-1°C)	2.9 in
April	42°F (6°C)	3.2 in
May	55°F (13°C)	3.4 in
June	64°F (18°C)	3.2 in
July	69°F (20°C)	3.5 in	Warmest
August	67°F (19°C)	3.5 in
September	60°F (15°C)	4.1 in	Wettest
October	48°F (9°C)	3.5 in
November	37°F (3°C)	4.1 in
December	26°F (-3°C)	3.7 in

St. Marys has a seasonal temperature swing of 48°F / from 21°F in February to 69°F in July. Total annual precipitation is 40.8 inches, with September being the wettest month (4.1") and February the driest (2.6").

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