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Weather & Climate in Grimsby, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grimsby experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 27°F in January while summers reach 73°F in July. The area gets 270 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 37.3 inches. The area receives 41.5 inches of snow annually, making winter weather a significant factor for residents. The city sits at an elevation of 292 feet.
Temperature
27°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 50.3°F |
| 7% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 292 ft (89 m) |
| Area | 26.5 sq mi (68.7 km²) |
| Population Density | 1,089/sq mi |
| Coordinates | 43.2001°N, 79.5663°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
20 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Feb 6, 2023 | 1 km NE of West Seneca, New York | M3.8 | 74 km | 6 km |
| Nov 26, 1999 | 14 km ESE of Centennial Scarborough, Canada | M3.8 | 73 km | 13 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 149 km | 18 km |
| May 24, 2000 | 4 km ENE of Centennial Scarborough, Canada | M3.1 | 77 km | 18 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 119 km | 5 km |
| May 8, 2018 | 14 km SSE of Ajax, Canada | M3.0 | 78 km | 5 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 64 km | 5 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 125 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 63 km | 6 km |
| Jun 5, 2009 | 4 km SSE of Attica, New York | M2.9 | 115 km | 5 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 26 km | 7 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 83 km | 6 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 77 km | 8 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 128 km | 5 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 101 km | 5 km |
| Sep 20, 2009 | 20 km ESE of Oakville, Canada | M2.6 | 23 km | 4 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 83 km | 5 km |
| Dec 17, 1990 | 5 km SSE of Middleboro, Pennsylvania | M2.5 | 146 km | 5 km |
| Jan 25, 1999 | New York | M2.5 | 149 km | 3 km |
| Feb 13, 2014 | 34 km N of Lyndonville, New York | M2.5 | 106 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: MOHAWK POOL (507 acres, 1994).
| Year | Name | Acres Burned | Distance |
| 1994 | MOHAWK POOL | 507 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.5 in | Coldest |
| February | 27°F (-3°C) | 2.2 in | Driest |
| March | 33°F (1°C) | 2.5 in | |
| April | 43°F (6°C) | 2.9 in | |
| May | 54°F (12°C) | 2.9 in | |
| June | 64°F (18°C) | 3.0 in | |
| July | 73°F (23°C) | 2.8 in | Warmest |
| August | 69°F (21°C) | 3.1 in | |
| September | 62°F (17°C) | 3.4 in | Wettest |
| October | 51°F (11°C) | 2.6 in | |
| November | 42°F (5°C) | 2.9 in | |
| December | 32°F (0°C) | 2.9 in |
Grimsby has a seasonal temperature swing of 45°F / from 27°F in January to 73°F in July. Total annual precipitation is 33.8 inches, with September being the wettest month (3.4") and February the driest (2.2").