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Weather & Climate in Grassy Lake, AB
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grassy Lake has a cool climate with an average annual temperature of 42°F (6°C). Winters average 15°F in January while summers reach 65°F in July. The area gets 310 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 14.1 inches (drier than the 38-inch national average). The area receives 3.6 inches of snow annually. The city sits at an elevation of 2,618 feet.
Temperature
15°F Jan (-9°C)
65°F Jul (18°C)
| Annual Average | 42.0°F |
| 22% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 310 days/yr |
Geography
| Elevation | 2,618 ft (798 m) |
| Area | 2.2 sq mi (5.7 km²) |
| Population Density | 391/sq mi |
| Coordinates | 49.8168°N, 111.7185°W |
| Timezone | America/Edmonton |
Precipitation & Snow
Air Quality
Earthquake History
17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| May 1, 1997 | 35 km SSE of Magrath, Canada | M3.8 | 102 km | 5 km |
| Sep 29, 2009 | 42 km NW of Santa Rita, Montana | M3.6 | 112 km | 21 km |
| Jan 3, 2008 | 13 km SSE of Magrath, Canada | M3.5 | 95 km | 38 km |
| Jan 20, 2003 | 10 km S of Little Browning, Montana | M3.5 | 150 km | 1 km |
| Jan 1, 1993 | 20 km WSW of Sweet Grass, Montana | M3.4 | 108 km | 5 km |
| Nov 6, 2002 | 3 km SSE of Little Browning, Montana | M3.4 | 142 km | 1 km |
| Jan 22, 1993 | 33 km SSE of Raymond, Canada | M3.4 | 84 km | 5 km |
| Aug 15, 1996 | 33 km WNW of Sweet Grass, Montana | M3.4 | 96 km | 5 km |
| Nov 17, 1992 | 39 km NNW of Santa Rita, Montana | M3.4 | 111 km | 5 km |
| Sep 7, 2014 | 36 km SSE of Magrath, Canada | M3.4 | 103 km | 15 km |
| Mar 5, 1995 | 2 km NW of Cut Bank, Montana | M3.3 | 138 km | 10 km |
| Jan 11, 2003 | 44 km SSE of Magrath, Canada | M3.2 | 110 km | 10 km |
| Apr 4, 1990 | 4 km WNW of Santa Rita, Montana | M3.1 | 131 km | 6 km |
| Jun 9, 2009 | 20 km NNW of Santa Rita, Montana | M3.0 | 118 km | 23 km |
| Jan 20, 2024 | 8 km S of Cardston, Canada | M2.8 | 139 km | 20 km |
| Apr 10, 2024 | 17 km NNW of Santa Rita, Montana | M2.7 | 121 km | 10 km |
| Mar 29, 2008 | 4 km SSE of Little Browning, Montana | M2.6 | 143 km | 3 km |
| Mar 29, 2008 | 3 km SSE of Cut Bank, Montana | M2.5 | 142 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 0.8 in | Coldest |
| February | 21°F (-6°C) | 0.6 in | Driest |
| March | 31°F (-1°C) | 0.9 in | |
| April | 43°F (6°C) | 1.2 in | |
| May | 54°F (12°C) | 1.8 in | |
| June | 61°F (16°C) | 2.6 in | Wettest |
| July | 65°F (18°C) | 1.3 in | Warmest |
| August | 65°F (18°C) | 1.5 in | |
| September | 55°F (13°C) | 1.5 in | |
| October | 45°F (7°C) | 0.7 in | |
| November | 29°F (-2°C) | 0.7 in | |
| December | 19°F (-7°C) | 0.8 in |
Grassy Lake has a seasonal temperature swing of 50°F / from 15°F in January to 65°F in July. Total annual precipitation is 14.2 inches, with June being the wettest month (2.6") and February the driest (0.6").