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Weather & Climate in Harriston, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Harriston has a cool climate with an average annual temperature of 43°F (6°C). Winters average 18°F in January while summers reach 67°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 42.1 inches. The area receives 13.2 inches of snow annually. The city sits at an elevation of 1,260 feet.
Temperature
18°F Jan (-8°C)
67°F Jul (19°C)
| Annual Average | 43.0°F |
| 20% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 67°F (19°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,260 ft (384 m) |
| Area | 258.2 sq mi (668.7 km²) |
| Population Density | 7/sq mi |
| Coordinates | 43.9120°N, 80.8720°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 143 km | 18 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 144 km | 7 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 129 km | 4 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 | - | 121 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 3.8 in | Coldest |
| February | 18°F (-8°C) | 2.9 in | |
| March | 27°F (-3°C) | 2.7 in | Driest |
| April | 40°F (5°C) | 3.0 in | |
| May | 53°F (12°C) | 3.5 in | |
| June | 62°F (16°C) | 3.2 in | |
| July | 67°F (19°C) | 3.5 in | Warmest |
| August | 65°F (18°C) | 3.9 in | |
| September | 58°F (15°C) | 4.2 in | Wettest |
| October | 47°F (9°C) | 3.6 in | |
| November | 36°F (2°C) | 4.1 in | |
| December | 25°F (-4°C) | 3.8 in |
Harriston has a seasonal temperature swing of 48°F / from 18°F in January to 67°F in July. Total annual precipitation is 42.1 inches, with September being the wettest month (4.2") and March the driest (2.7").