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Weather & Climate in Gravenhurst, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Gravenhurst experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 25°F in January while summers reach 69°F in July. The area gets 231 sunny days per year, above the national average. Annual precipitation totals 43.3 inches. The area receives 67.6 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 860 feet.
Temperature
25°F Jan (-4°C)
69°F Jul (20°C)
| Annual Average | 46.3°F |
| 14% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 231 days/yr |
Geography
| Elevation | 860 ft (262 m) |
| Area | 188.9 sq mi (489.1 km²) |
| Population Density | 70/sq mi |
| Coordinates | 44.9168°N, 79.3663°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
5 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 | 137 km | 13 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 125 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 136 km | 5 km |
| Jul 29, 2012 | 17 km SSW of Parry Sound, Canada | M2.5 | 64 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 19 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 | - | 129 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 4.0 in | |
| February | 16°F (-9°C) | 2.6 in | Coldest, Driest |
| March | 26°F (-3°C) | 2.7 in | |
| April | 39°F (4°C) | 3.0 in | |
| May | 52°F (11°C) | 3.5 in | |
| June | 61°F (16°C) | 3.2 in | |
| July | 69°F (20°C) | 3.2 in | Warmest |
| August | 65°F (19°C) | 3.5 in | |
| September | 58°F (14°C) | 4.2 in | |
| October | 47°F (8°C) | 3.9 in | |
| November | 35°F (2°C) | 4.3 in | Wettest |
| December | 22°F (-5°C) | 4.1 in |
Gravenhurst has a seasonal temperature swing of 53°F / from 16°F in February to 69°F in July. Total annual precipitation is 42.1 inches, with November being the wettest month (4.3") and February the driest (2.6").