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Weather & Climate in Selwyn, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Selwyn has a cool climate with an average annual temperature of 43°F (6°C). Winters average 15°F in January while summers reach 68°F in July. The area gets 271 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 35.8 inches. The area receives 13.9 inches of snow annually. The city sits at an elevation of 919 feet.
Temperature
15°F Jan (-9°C)
68°F Jul (20°C)
| Annual Average | 42.7°F |
| 21% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 919 ft (280 m) |
| Area | 122.1 sq mi (316.1 km²) |
| Population Density | 153/sq mi |
| Coordinates | 44.4653°N, 78.3180°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
16 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 | 100 km | 13 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 77 km | 18 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 144 km | 18 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 96 km | 18 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 96 km | 5 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 86 km | 5 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 85 km | 18 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 84 km | 5 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 149 km | 7 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 119 km | 8 km |
| Aug 11, 2007 | 4 km N of Kingston, Canada | M2.6 | 148 km | 4 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 116 km | 5 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 150 km | 4 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 117 km | 5 km |
| May 17, 2010 | 19 km WNW of Gravenhurst, Canada | M2.5 | 116 km | 5 km |
| Feb 13, 2014 | 34 km N of Lyndonville, New York | M2.5 | 92 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 2.8 in | Coldest |
| February | 18°F (-8°C) | 2.2 in | Driest |
| March | 28°F (-3°C) | 2.4 in | |
| April | 42°F (5°C) | 2.7 in | |
| May | 54°F (12°C) | 3.3 in | |
| June | 63°F (17°C) | 3.2 in | |
| July | 68°F (20°C) | 2.8 in | Warmest |
| August | 66°F (19°C) | 3.3 in | |
| September | 58°F (14°C) | 3.5 in | |
| October | 46°F (8°C) | 3.1 in | |
| November | 35°F (2°C) | 3.6 in | Wettest |
| December | 22°F (-5°C) | 2.9 in |
Selwyn has a seasonal temperature swing of 52°F / from 15°F in January to 68°F in July. Total annual precipitation is 35.8 inches, with November being the wettest month (3.6") and February the driest (2.2").