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Weather & Climate in Severn, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Severn has a cool climate with an average annual temperature of 43°F (6°C). Winters average 15°F in January while summers reach 67°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 40.6 inches. The area receives 13.2 inches of snow annually. The city sits at an elevation of 643 feet.
Temperature
15°F Jan (-9°C)
67°F Jul (20°C)
| Annual Average | 42.5°F |
| 21% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 262 days/yr |
Geography
| Elevation | 643 ft (196 m) |
| Area | 202.0 sq mi (523.1 km²) |
| Population Density | 72/sq mi |
| Coordinates | 44.7547°N, 79.5149°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 | 123 km | 13 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 111 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 122 km | 5 km |
| Jul 29, 2012 | 17 km SSW of Parry Sound, Canada | M2.5 | 66 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 29 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 | - | 120 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 4.1 in | Coldest |
| February | 17°F (-9°C) | 2.6 in | |
| March | 26°F (-3°C) | 2.5 in | Driest |
| April | 40°F (4°C) | 2.6 in | |
| May | 53°F (12°C) | 3.4 in | |
| June | 62°F (16°C) | 3.2 in | |
| July | 67°F (20°C) | 3.0 in | Warmest |
| August | 66°F (19°C) | 3.4 in | |
| September | 59°F (15°C) | 3.9 in | |
| October | 47°F (8°C) | 3.6 in | |
| November | 36°F (2°C) | 4.2 in | Wettest |
| December | 23°F (-5°C) | 4.0 in |
Severn has a seasonal temperature swing of 52°F / from 15°F in January to 67°F in July. Total annual precipitation is 40.6 inches, with November being the wettest month (4.2") and March the driest (2.5").