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Weather & Climate in Mississippi Mills, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mississippi Mills experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 23°F in January while summers reach 70°F in July. The area gets 232 sunny days per year, above the national average. Annual precipitation totals 43.7 inches. The area receives 73.7 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 472 feet.
Temperature
23°F Jan (-5°C)
70°F Jul (21°C)
| Annual Average | 45.9°F |
| 15% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 232 days/yr |
Geography
| Elevation | 472 ft (144 m) |
| Area | 197.4 sq mi (511.2 km²) |
| Population Density | 75/sq mi |
| Coordinates | 45.2334°N, 76.1994°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
128 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 | 92 km | 19 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M5.1 | 59 km | 13 km |
| Oct 19, 1990 | 11 km SW of Mont-Laurier, Canada | M4.6 | 145 km | 13 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 144 km | 18 km |
| Dec 25, 1993 | 9 km WSW of Mont-Laurier, Canada | M4.3 | 149 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 102 km | 18 km |
| Aug 6, 2000 | 7 km SSW of La Minerve, Canada | M4.0 | 143 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 120 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 89 km | 11 km |
| Mar 6, 1991 | 49 km NNW of Fort-Coulonge, Canada | M3.9 | 128 km | 18 km |
| Oct 7, 1990 | 21 km WNW of La Minerve, Canada | M3.9 | 144 km | 18 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 137 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 86 km | 5 km |
| Nov 6, 2012 | Ontario-Quebec border region, Canada | M3.7 | 132 km | 11 km |
| Feb 26, 1998 | 33 km SW of Saint-Raphaël, Canada | M3.7 | 94 km | 18 km |
| Sep 12, 1995 | 8 km S of Brownsburg-Chatham, Canada | M3.7 | 144 km | 18 km |
| May 17, 2013 | 20 km NNE of Shawville, Canada | M3.6 | 60 km | 11 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 106 km | 18 km |
| Nov 2, 2009 | 5 km S of Lac-Simon, Canada | M3.6 | 149 km | 4 km |
| May 6, 1993 | 27 km S of Mont-Laurier, Canada | M3.5 | 130 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 | 76 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 2.2 in | |
| February | 14°F (-10°C) | 1.8 in | Coldest, Driest |
| March | 25°F (-4°C) | 2.2 in | |
| April | 40°F (4°C) | 2.6 in | |
| May | 53°F (12°C) | 2.7 in | |
| June | 63°F (17°C) | 3.0 in | |
| July | 70°F (21°C) | 3.4 in | Warmest, Wettest |
| August | 66°F (19°C) | 3.1 in | |
| September | 58°F (14°C) | 3.1 in | |
| October | 46°F (8°C) | 2.8 in | |
| November | 35°F (1°C) | 2.8 in | |
| December | 20°F (-7°C) | 2.4 in |
Mississippi Mills has a seasonal temperature swing of 56°F / from 14°F in February to 70°F in July. Total annual precipitation is 32.2 inches, with July being the wettest month (3.4") and February the driest (1.8").