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Weather & Climate in North Granby, CT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
North Granby experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 25°F in January while summers reach 72°F in July. The area gets 259 sunny days per year, above the national average. Annual precipitation totals 52.4 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 394 feet.
Temperature
25°F Jan (-4°C)
72°F Jul (22°C)
| Annual Average | 48.7°F |
| 10% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 394 ft (120 m) |
| Area | 8.3 sq mi (21.6 km²) |
| Population Density | 181/sq mi |
| Coordinates | 42.0160°N, 72.8432°W |
| Timezone | America/New_York |
| County | Hampden County County |
| Nearest Airport | Bradley International (BDL) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 92.8 / 100 |
| Social Vulnerability | 64.5 / 100 |
| Community Resilience | 73.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
30 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.
| Oct 2, 1994 | 6 km W of Hardwick, Massachusetts | M3.7 | 59 km | 10 km |
| Oct 2, 1994 | 1 km NW of Hardwick, Massachusetts | M3.3 | 64 km | 10 km |
| Jan 12, 2015 | 0 km NE of Wauregan, Connecticut | M3.3 | 83 km | 5 km |
| Jun 16, 2000 | 5 km NE of Granville, Massachusetts | M3.3 | 10 km | 10 km |
| Dec 13, 2009 | 15 km N of Medusa, New York | M3.2 | 121 km | 10 km |
| Mar 22, 1996 | 2 km NE of Bristol, Rhode Island | M3.1 | 138 km | 12 km |
| May 18, 2009 | 15 km N of Medusa, New York | M3.1 | 121 km | 9 km |
| Jul 24, 2007 | 12 km SSW of Altamont, New York | M3.1 | 124 km | 15 km |
| Oct 28, 1991 | 3 km WNW of Stamford, Connecticut | M3.0 | 122 km | 10 km |
| Oct 21, 2009 | 15 km N of Medusa, New York | M2.9 | 121 km | 7 km |
| Aug 5, 2025 | 1 km N of Hillsdale, New Jersey | M2.8 | 149 km | 12 km |
| Sep 28, 2002 | 2 km N of Wilton, New Hampshire | M2.8 | 132 km | 5 km |
| Mar 10, 1992 | 2 km SW of Napeague, New York | M2.8 | 130 km | 10 km |
| Aug 27, 2011 | 5 km WSW of Altamont, New York | M2.8 | 127 km | 22 km |
| Mar 22, 2009 | 9 km SW of Altamont, New York | M2.8 | 125 km | 16 km |
| Oct 13, 1999 | 2 km E of Littleton Common, Massachusetts | M2.7 | 130 km | 2 km |
| Apr 12, 1991 | 2 km ENE of North Castle, New York | M2.7 | 117 km | 9 km |
| Sep 30, 1991 | 0 km SSE of Bedford, New Hampshire | M2.7 | 150 km | 4 km |
| Aug 25, 2011 | 5 km WSW of Altamont, New York | M2.7 | 127 km | 18 km |
| Feb 18, 2009 | 15 km N of Medusa, New York | M2.7 | 121 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 1991 | Bob | Category 2 | 104 mph | 138 km |
| 1985 | Gloria | Category 1 | 86 mph | 13 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
267 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 111 fatalities, 2,241 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 29, 1995 | EF4 | 53 km | 11.5 mi | 3 |
| Jul 10, 1989 | EF4 | 71 km | 3.0 mi | 0 |
| Oct 3, 1979 | EF4 | 21 km | 11.3 mi | 3 |
| Aug 28, 1973 | EF4 | 65 km | 9.8 mi | 4 |
| Jun 9, 1953 | EF4 | 75 km | 34.9 mi | 94 |
| Jun 1, 2011 | EF3 | 12 km | 37.6 mi | 3 |
| Jun 22, 1981 | EF3 | 86 km | 7.1 mi | 0 |
| Jun 16, 1974 | EF3 | 85 km | 49.1 mi | 0 |
| Sep 13, 1971 | EF3 | 38 km | 0.5 mi | 0 |
| Jul 29, 1971 | EF3 | 55 km | 0.1 mi | 0 |
| Oct 3, 1970 | EF3 | 66 km | 35.4 mi | 1 |
| May 24, 1962 | EF3 | 57 km | 11.6 mi | 1 |
| May 10, 1954 | EF3 | 33 km | 0.3 mi | 0 |
| Jun 9, 1953 | EF3 | 90 km | 28.0 mi | 0 |
| Aug 21, 1951 | EF3 | 56 km | 0.1 mi | 0 |
| May 15, 2018 | EF2 | 90 km | 1.2 mi | 0 |
| Jul 11, 2006 | EF2 | 70 km | 2.9 mi | 0 |
| Jul 21, 2003 | EF2 | 95 km | 1.5 mi | 0 |
| Jul 21, 2003 | EF2 | 83 km | 1.3 mi | 0 |
| Jun 23, 2001 | EF2 | 33 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | — | 137 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: EAST MOUNTAIN (964 acres, 2021).
| Year | Name | Acres Burned | Distance |
| 2021 | EAST MOUNTAIN | 964 | 83 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 3.7 in | |
| February | 24°F (-5°C) | 3.5 in | Coldest, Driest |
| March | 32°F (0°C) | 3.9 in | |
| April | 44°F (6°C) | 4.1 in | |
| May | 55°F (13°C) | 4.5 in | Wettest |
| June | 63°F (17°C) | 4.1 in | |
| July | 72°F (22°C) | 4.0 in | Warmest |
| August | 67°F (20°C) | 4.3 in | |
| September | 60°F (15°C) | 3.9 in | |
| October | 49°F (9°C) | 3.8 in | |
| November | 39°F (4°C) | 4.5 in | |
| December | 28°F (-2°C) | 4.2 in |
North Granby has a seasonal temperature swing of 49°F / from 24°F in February to 72°F in July. Total annual precipitation is 48.6 inches, with May being the wettest month (4.5") and February the driest (3.5").