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Weather & Climate in Alliston, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Alliston experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 28°F in January while summers reach 69°F in July. The area gets 236 sunny days per year, above the national average. Annual precipitation totals 36.8 inches. The area receives 51.6 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 732 feet.
Temperature
28°F Jan (-2°C)
69°F Jul (21°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 236 days/yr |
Geography
| Elevation | 732 ft (223 m) |
| Area | 103.0 sq mi (266.7 km²) |
| Population Density | 183/sq mi |
| Coordinates | 44.1501°N, 79.8664°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
13 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 | 85 km | 13 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 72 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 87 km | 5 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 139 km | 5 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 142 km | 5 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 104 km | 7 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 126 km | 8 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 145 km | 5 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 92 km | 4 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 130 km | 5 km |
| Jul 29, 2012 | 17 km SSW of Parry Sound, Canada | M2.5 | 117 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 99 km | 5 km |
| Feb 13, 2014 | 34 km N of Lyndonville, New York | M2.5 | 131 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 |
| 1855 | OWEN SOUND, LAKE HURON | Unknown | 2.7 m | — | 130 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.3 in | |
| February | 18°F (-8°C) | 2.0 in | Coldest, Driest |
| March | 27°F (-3°C) | 2.0 in | |
| April | 40°F (5°C) | 2.6 in | |
| May | 53°F (11°C) | 3.1 in | |
| June | 62°F (17°C) | 3.1 in | |
| July | 69°F (21°C) | 3.0 in | Warmest |
| August | 66°F (19°C) | 3.2 in | Wettest |
| September | 59°F (15°C) | 3.2 in | |
| October | 48°F (9°C) | 2.8 in | |
| November | 37°F (3°C) | 3.2 in | |
| December | 25°F (-4°C) | 2.4 in |
Alliston has a seasonal temperature swing of 51°F / from 18°F in February to 69°F in July. Total annual precipitation is 32.8 inches, with August being the wettest month (3.2") and February the driest (2.0").