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Weather & Climate in Grand Isle, ME
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grand Isle has a cool climate with an average annual temperature of 40°F (5°C). Winters average 11°F in January while summers reach 66°F in July. The area gets 249 sunny days per year, above the national average. Annual precipitation totals 32.9 inches. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 544 feet.
Temperature
11°F Jan (-12°C)
66°F Jul (19°C)
| Annual Average | 40.1°F |
| 26% below US avg | |
| January Average | 11°F (-12°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 249 days/yr |
Geography
| Elevation | 544 ft (166 m) |
| Area | 0.7 sq mi (1.8 km²) |
| Population Density | 394/sq mi |
| Coordinates | 47.3074°N, 68.1587°W |
| Timezone | America/New_York |
| County | Aroostook County County |
| Nearest Airport | Northern Aroostook Regional (WFK) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 80.4 / 100 |
| Social Vulnerability | 67.6 / 100 |
| Community Resilience | 51.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Very High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
64 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.
| Mar 6, 2005 | 15 km SE of Saint-Siméon, Canada | M4.9 | 128 km | 13 km |
| Oct 28, 1997 | 18 km E of La Malbaie, Canada | M4.8 | 138 km | 12 km |
| Sep 25, 1994 | 10 km SW of Saint-Siméon, Canada | M4.1 | 145 km | 17 km |
| Jul 15, 1998 | 84 km W of Miramichi, Canada | M4.0 | 121 km | 5 km |
| May 6, 1995 | 83 km W of Miramichi, Canada | M3.9 | 123 km | 5 km |
| Jul 14, 2006 | 13 km SW of Winterville, Maine | M3.9 | 62 km | 14 km |
| Jul 14, 1994 | 83 km W of Miramichi, Canada | M3.8 | 123 km | 5 km |
| Jan 5, 2005 | 81 km W of Miramichi, Canada | M3.7 | 125 km | 5 km |
| Jun 15, 2000 | 16 km N of Saint-Pascal, Canada | M3.7 | 131 km | 11 km |
| Dec 8, 1991 | 17 km SSE of Saint-Siméon, Canada | M3.6 | 131 km | 18 km |
| Jun 1, 2006 | 19 km NE of Florenceville-Bristol, Canada | M3.6 | 97 km | 5 km |
| Dec 12, 1990 | 83 km W of Miramichi, Canada | M3.5 | 123 km | 5 km |
| Oct 18, 2003 | 48 km ESE of Hamlin, Maine | M3.5 | 84 km | 18 km |
| Mar 30, 1990 | 6 km WSW of Grand Isle, Maine | M3.5 | 6 km | 18 km |
| Dec 1, 1993 | 15 km SSE of La Malbaie, Canada | M3.5 | 145 km | 8 km |
| Apr 28, 2014 | 81 km W of Miramichi, Canada | M3.4 | 125 km | 5 km |
| Apr 23, 1991 | 83 km W of Miramichi, Canada | M3.3 | 123 km | 5 km |
| Jun 28, 2015 | 5 km NW of La Pocatière, Canada | M3.3 | 146 km | 7 km |
| Aug 28, 2013 | 84 km W of Miramichi, Canada | M3.2 | 123 km | 5 km |
| Jan 10, 2022 | 14 km N of Saint-Pascal, Canada | M3.2 | 131 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
24 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 4 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 15, 1958 | EF2 | 48 km | 17.0 mi | 0 |
| Aug 11, 1954 | EF2 | 34 km | 1.0 mi | 1 |
| May 31, 2009 | EF1 | 86 km | 2.8 mi | 0 |
| May 31, 2009 | EF1 | 81 km | 7.0 mi | 0 |
| May 24, 2009 | EF1 | 47 km | 2.7 mi | 0 |
| Jun 18, 1994 | EF1 | 60 km | 3.5 mi | 0 |
| Jun 18, 1994 | EF1 | 50 km | 10.0 mi | 0 |
| Oct 12, 1971 | EF1 | 36 km | 0.1 mi | 0 |
| Jul 1, 1971 | EF1 | 49 km | 1.0 mi | 0 |
| Sep 21, 1965 | EF1 | 50 km | 0.1 mi | 0 |
| May 19, 1963 | EF1 | 47 km | 1.5 mi | 0 |
| Jul 18, 1961 | EF1 | 62 km | 0.5 mi | 0 |
| Jun 29, 1961 | EF1 | 19 km | 0.5 mi | 0 |
| Aug 29, 1960 | EF1 | 50 km | 9.7 mi | 0 |
| Aug 15, 1959 | EF1 | 94 km | 1.0 mi | 0 |
| Jul 18, 2016 | EF0 | 44 km | 0.1 mi | 0 |
| Jun 9, 2011 | EF0 | 63 km | 0.3 mi | 0 |
| Jun 8, 2011 | EF0 | 35 km | 9.0 mi | 0 |
| Jun 8, 2011 | EF0 | 74 km | 0.1 mi | 0 |
| Jun 26, 2009 | EF0 | 31 km | 0.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 11°F (-12°C) | 3.4 in | |
| February | 10°F (-12°C) | 2.6 in | Coldest, Driest |
| March | 22°F (-6°C) | 2.8 in | |
| April | 36°F (2°C) | 2.7 in | |
| May | 49°F (10°C) | 3.4 in | |
| June | 59°F (15°C) | 3.5 in | |
| July | 66°F (19°C) | 4.4 in | Warmest, Wettest |
| August | 62°F (17°C) | 4.1 in | |
| September | 53°F (12°C) | 3.6 in | |
| October | 42°F (6°C) | 3.7 in | |
| November | 31°F (-1°C) | 3.7 in | |
| December | 15°F (-9°C) | 3.8 in |
Grand Isle has a seasonal temperature swing of 56°F / from 10°F in February to 66°F in July. Total annual precipitation is 41.6 inches, with July being the wettest month (4.4") and February the driest (2.6").