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Weather & Climate in Perth South, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Perth South has a cool climate with an average annual temperature of 45°F (7°C). Winters average 20°F in January while summers reach 68°F in July. The area gets 262 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 40.8 inches. The area receives 12.4 inches of snow annually. The city sits at an elevation of 1,093 feet.
Temperature
20°F Jan (-7°C)
68°F Jul (20°C)
| Annual Average | 44.6°F |
| 17% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 262 days/yr |
Geography
| Elevation | 1,093 ft (333 m) |
| Area | 151.3 sq mi (391.9 km²) |
| Population Density | 25/sq mi |
| Coordinates | 43.3117°N, 81.1365°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.8.
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 150 km | 7 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 138 km | 4 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 116 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
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 | - | 114 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 105 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 3.2 in | Coldest |
| February | 21°F (-6°C) | 2.6 in | 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 | 68°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 |
Perth South has a seasonal temperature swing of 48°F / from 20°F in January to 68°F in July. Total annual precipitation is 40.8 inches, with September being the wettest month (4.1") and February the driest (2.6").