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Weather & Climate in Perth, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Perth experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 25°F in January while summers reach 71°F in July. The area gets 238 sunny days per year, above the national average. Annual precipitation totals 39.5 inches. The area receives 58.7 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 459 feet.
Temperature
25°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 47.1°F |
| 13% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 238 days/yr |
Geography
| Elevation | 459 ft (140 m) |
| Area | 4.7 sq mi (12.2 km²) |
| Population Density | 1,372/sq mi |
| Coordinates | 44.9001°N, 76.2494°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
93 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 | 125 km | 19 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 96 km | 13 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 124 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 145 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 115 km | 11 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 111 km | 5 km |
| Feb 26, 1998 | 33 km SW of Saint-Raphaël, Canada | M3.7 | 130 km | 18 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M3.6 | 96 km | 11 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 123 km | 18 km |
| Apr 23, 2023 | New York | M3.6 | 117 km | 9 km |
| Feb 15, 1995 | 13 km SSE of Notre-Dame-du-Mont-Carmel, Canada | M3.5 | 146 km | 18 km |
| Jan 16, 2013 | 28 km W of Notre-Dame-du-Mont-Carmel, Canada | M3.5 | 144 km | 18 km |
| May 14, 2016 | 8 km NW of Petawawa, Canada | M3.5 | 145 km | 18 km |
| May 28, 2002 | 11 km WNW of Shawville, Canada | M3.4 | 86 km | 18 km |
| Jun 23, 2010 | 28 km NNE of Val-des-Monts, Canada | M3.3 | 124 km | 23 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 131 km | 5 km |
| Jun 11, 2008 | 6 km NNE of Buckingham, Canada | M3.3 | 106 km | 18 km |
| Jul 15, 2015 | 15 km SSE of Hawkesbury, Canada | M3.3 | 148 km | 10 km |
| Jun 24, 2010 | 27 km NNE of Val-des-Monts, Canada | M3.2 | 122 km | 17 km |
| Aug 24, 2011 | 13 km ENE of Saint Regis Falls, New York | M3.2 | 149 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 | 109 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.7 in | |
| February | 16°F (-9°C) | 2.1 in | Coldest, Driest |
| March | 27°F (-3°C) | 2.3 in | |
| April | 41°F (5°C) | 2.6 in | |
| May | 54°F (12°C) | 3.1 in | |
| June | 63°F (17°C) | 3.3 in | |
| July | 71°F (22°C) | 3.2 in | Warmest |
| August | 67°F (19°C) | 3.1 in | |
| September | 58°F (15°C) | 3.7 in | Wettest |
| October | 47°F (8°C) | 3.1 in | |
| November | 35°F (2°C) | 3.4 in | |
| December | 21°F (-6°C) | 2.7 in |
Perth has a seasonal temperature swing of 56°F / from 16°F in February to 71°F in July. Total annual precipitation is 35.1 inches, with September being the wettest month (3.7") and February the driest (2.1").