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Weather & Climate in North Grosvenor Dale, CT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
North Grosvenor Dale experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 71°F in July. The area gets 271 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 50.1 inches (wetter than the 38-inch national average). The area receives 38.5 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 372 feet.
Temperature
25°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 48.2°F |
| 11% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 372 ft (113 m) |
| Area | 2.3 sq mi (5.9 km²) |
| Population Density | 483/sq mi |
| Coordinates | 41.9862°N, 71.9033°W |
| Timezone | America/New_York |
| County | Northeastern Connecticut Planning Region County |
| Nearest Airport | Worcester Regional (ORH) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 62.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 61.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | No Rating |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
22 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 | 51 km | 10 km |
| Jan 12, 2015 | 0 km NE of Wauregan, Connecticut | M3.3 | 27 km | 5 km |
| Jun 16, 2000 | 5 km NE of Granville, Massachusetts | M3.3 | 77 km | 10 km |
| Oct 2, 1994 | 1 km NW of Hardwick, Massachusetts | M3.3 | 49 km | 10 km |
| Mar 22, 1996 | 2 km NE of Bristol, Rhode Island | M3.1 | 64 km | 12 km |
| Jan 10, 1999 | 2 km ENE of Merrimac, Massachusetts | M3.1 | 122 km | 2 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 127 km | 1 km |
| Jan 10, 1999 | 1 km NNE of Merrimac, Massachusetts | M3.0 | 121 km | 2 km |
| Mar 10, 1992 | 2 km SW of Napeague, New York | M2.8 | 112 km | 10 km |
| Mar 21, 2016 | 4 km ESE of Warner, New Hampshire | M2.8 | 143 km | 7 km |
| Sep 28, 2002 | 2 km N of Wilton, New Hampshire | M2.8 | 99 km | 5 km |
| Oct 11, 1990 | 5 km NNE of The Pinehills, Massachusetts | M2.7 | 110 km | 13 km |
| Sep 30, 1991 | 0 km SSE of Bedford, New Hampshire | M2.7 | 111 km | 4 km |
| Feb 15, 2018 | 0 km SE of East Kingston, New Hampshire | M2.7 | 127 km | 7 km |
| Oct 13, 1999 | 2 km E of Littleton Common, Massachusetts | M2.7 | 73 km | 2 km |
| Aug 14, 2014 | 6 km SW of Deep River Center, Connecticut | M2.7 | 86 km | 4 km |
| Oct 11, 2013 | New Hampshire | M2.6 | 142 km | 4 km |
| Jan 13, 2015 | 2 km E of Wauregan, Connecticut | M2.6 | 27 km | 9 km |
| Apr 22, 1996 | 3 km NE of North Westport, Massachusetts | M2.6 | 78 km | 5 km |
| Jan 23, 1990 | 3 km NNW of Boxborough, Massachusetts | M2.5 | 67 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
4 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2021 | Henri | Category 1 | 75 mph | 298 km |
| 2014 | Arthur | Category 1 | 75 mph | 271 km |
| 1991 | Bob | Category 2 | 104 mph | 77 km |
| 1985 | Gloria | Category 1 | 86 mph | 75 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
237 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 105 fatalities, 2,030 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Oct 3, 1979 | EF4 | 65 km | 11.3 mi | 3 |
| Jun 9, 1953 | EF4 | 58 km | 34.9 mi | 94 |
| Jun 1, 2011 | EF3 | 71 km | 37.6 mi | 3 |
| Jun 22, 1981 | EF3 | 58 km | 7.1 mi | 0 |
| Sep 29, 1974 | EF3 | 88 km | 0.1 mi | 0 |
| Sep 13, 1971 | EF3 | 74 km | 0.5 mi | 0 |
| Oct 3, 1970 | EF3 | 44 km | 35.4 mi | 1 |
| May 10, 1954 | EF3 | 47 km | 0.3 mi | 0 |
| Jun 9, 1953 | EF3 | 23 km | 28.0 mi | 0 |
| Aug 21, 1951 | EF3 | 67 km | 0.1 mi | 0 |
| Aug 18, 2023 | EF2 | 34 km | 9.1 mi | 0 |
| Jul 28, 2014 | EF2 | 86 km | 1.9 mi | 0 |
| Jul 11, 2006 | EF2 | 75 km | 2.9 mi | 0 |
| Aug 7, 1986 | EF2 | 45 km | 4.0 mi | 0 |
| Jul 5, 1984 | EF2 | 94 km | 3.0 mi | 0 |
| Aug 10, 1979 | EF2 | 42 km | 9.7 mi | 2 |
| Jul 24, 1975 | EF2 | 65 km | 0.3 mi | 0 |
| Sep 18, 1973 | EF2 | 93 km | 0.1 mi | 0 |
| Sep 6, 1973 | EF2 | 56 km | 3.3 mi | 0 |
| Aug 31, 1973 | EF2 | 74 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: THE RANGE (760 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | THE RANGE | 760 | 61 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 4.0 in | Coldest |
| February | 26°F (-4°C) | 3.5 in | Driest |
| March | 35°F (1°C) | 4.0 in | |
| April | 45°F (7°C) | 4.2 in | |
| May | 55°F (13°C) | 4.0 in | |
| June | 64°F (18°C) | 4.0 in | |
| July | 71°F (22°C) | 3.9 in | Warmest |
| August | 70°F (21°C) | 4.0 in | |
| September | 62°F (17°C) | 3.9 in | |
| October | 51°F (10°C) | 4.1 in | |
| November | 42°F (5°C) | 4.6 in | Wettest |
| December | 31°F (-1°C) | 4.3 in |
North Grosvenor Dale has a seasonal temperature swing of 46°F / from 25°F in January to 71°F in July. Total annual precipitation is 48.4 inches, with November being the wettest month (4.6") and February the driest (3.5").