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Weather & Climate in Brockville, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Brockville experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 27°F in January while summers reach 71°F in July. The area gets 225 sunny days per year, above the national average. Annual precipitation totals 46.6 inches (wetter than the 38-inch national average). The area receives 50.3 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 305 feet.
Temperature
27°F Jan (-3°C)
71°F Jul (22°C)
| Annual Average | 48.0°F |
| 11% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 225 days/yr |
Geography
| Elevation | 305 ft (93 m) |
| Area | 8.1 sq mi (20.9 km²) |
| Population Density | 2,740/sq mi |
| Coordinates | 44.5913°N, 75.6871°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
100 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.
| Jun 23, 2010 | 29 km NNE of Val-des-Monts, Canada | M5.4 | 145 km | 19 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 140 km | 13 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 143 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 122 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 146 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 121 km | 11 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 144 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 145 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 118 km | 5 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 144 km | 18 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 134 km | 5 km |
| Nov 6, 2012 | Ontario-Quebec border region, Canada | M3.7 | 143 km | 11 km |
| Apr 8, 2003 | 17 km ESE of Saint Regis Falls, New York | M3.7 | 107 km | 10 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M3.6 | 140 km | 11 km |
| Apr 23, 2023 | New York | M3.6 | 85 km | 9 km |
| May 28, 2002 | 11 km WNW of Shawville, Canada | M3.4 | 137 km | 18 km |
| Jan 13, 2020 | 5 km SW of Franklin, Canada | M3.4 | 143 km | 6 km |
| Jun 23, 2010 | 28 km NNE of Val-des-Monts, Canada | M3.3 | 143 km | 23 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 109 km | 5 km |
| Jun 11, 2008 | 6 km NNE of Buckingham, Canada | M3.3 | 119 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 15.0 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1908 | NOTRE DAME DE LA SALETTE | Meteorological | 15.0 m | 33 | 131 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.5 in | |
| February | 18°F (-8°C) | 2.2 in | Coldest, Driest |
| March | 29°F (-2°C) | 2.3 in | |
| April | 42°F (6°C) | 2.9 in | |
| May | 55°F (13°C) | 3.1 in | |
| June | 64°F (18°C) | 3.1 in | |
| July | 71°F (22°C) | 3.1 in | Warmest |
| August | 67°F (20°C) | 3.6 in | |
| September | 59°F (15°C) | 3.9 in | Wettest |
| October | 48°F (9°C) | 3.2 in | |
| November | 37°F (3°C) | 3.5 in | |
| December | 23°F (-5°C) | 3.0 in |
Brockville has a seasonal temperature swing of 53°F / from 18°F in February to 71°F in July. Total annual precipitation is 36.5 inches, with September being the wettest month (3.9") and February the driest (2.2").