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. 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) |
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").