Sarnia, ON

Full City Profile · Ontario

2.8 /5.0

C+ Fair

648 Population 133/sq mi density

$77,500 Median Income $53,350 per capita

$400,000 Home Value

$990 Median Rent 18.0% income on rent

47°F Avg Temperature 274 sunny days/yr

C+

Overall

2.8 / 5.0

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

Economy

3.1 / 5.0

$77,500 median income, 13.0% unemployment

B+

Affordability

3.8 / 5.0

$400,000 home value, $990/mo rent

C+

Safety

2.5 / 5.0

Education

2.0 / 5.0

12.5% bachelor's degree or higher

Sarnia experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 23°F in January while summers reach 71°F in July. The area gets 274 sunny days per year. Annual precipitation totals 33.9 inches. The area receives 8.9 inches of snow annually.

Temperature

23°F Jan (-5°C) 71°F Jul (22°C)

Annual Average	47.4°F
	12% below US avg
January Average	23°F (-5°C)
July Average	71°F (22°C)
Sunny Days	274 days/yr

Geography

Elevation	610 ft (186 m)
Area	4.9 sq mi (12.6 km²)
Population Density	133/sq mi
Coordinates	42.9787°N, 82.4041°W
Timezone	America/Toronto

Precipitation & Snow

Annual Rainfall 33.9"

11% below US avg

Snowfall 8.9"

Wettest Month (Sep) 3.90"

Driest Month (Feb) 1.97"

Air Quality

Earthquake History

9 earthquakes (M2.5+) within 150 km since 1990. Strongest: M3.4. Most recent: M2.5 on May 23, 2022.

Apr 20, 2018	Michigan	M3.4	108 km
Feb 23, 2011	18 km NE of Leamington, Canada	M3.0	91 km
Apr 12, 2007	11 km NW of Put-in-Bay, Ohio	M2.8	146 km
Sep 22, 1999	16 km NW of Mentor-on-the-Lake, Ohio	M2.8	149 km
May 14, 2017	18 km ENE of Leamington, Canada	M2.6	94 km
Sep 7, 2012	17 km ESE of Stony Point, Michigan	M2.5	136 km
Mar 8, 2010	7 km ENE of Grosse Ile, Michigan	M2.5	106 km
May 23, 2022	2 km NNW of Corunna, Canada	M2.5	9 km
Feb 17, 2013	31 km E of Leamington, Canada	M2.5	108 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	—	138 km
1952	LAKE HURON, MI	Avalanche	1.5 m	—	14 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	23°F (-5°C)	2.1 in	Coldest
February	24°F (-5°C)	2.0 in	Driest
March	33°F (1°C)	2.3 in
April	44°F (7°C)	2.9 in
May	56°F (13°C)	3.0 in
June	66°F (19°C)	3.3 in
July	71°F (22°C)	2.8 in	Warmest
August	70°F (21°C)	3.1 in
September	63°F (17°C)	3.9 in	Wettest
October	52°F (11°C)	2.8 in
November	40°F (4°C)	3.2 in
December	29°F (-2°C)	2.6 in

Sarnia has a seasonal temperature swing of 48°F / from 23°F in January to 71°F in July. Total annual precipitation is 33.9 inches, with September being the wettest month (3.9") and February the driest (2.0").

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