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Weather & Climate in Plantsville, CT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Plantsville experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 28°F in January while summers reach 73°F in July. The area gets 275 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 44.9 inches. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 151 feet.
Temperature
28°F Jan (-2°C)
73°F Jul (23°C)
| Annual Average | 50.7°F |
| 6% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 151 ft (46 m) |
| Area | 1.0 sq mi (2.6 km²) |
| Population Density | 2,045/sq mi |
| Coordinates | 41.5832°N, 72.8919°W |
| Timezone | America/New_York |
| County | South Central Connecticut Planning Region County |
| Nearest Airport | Bradley International (BDL) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.1 / 100 |
| Social Vulnerability | 45.2 / 100 |
| Community Resilience | 79.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Coastal Flood | Relatively High |
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 | 99 km | 10 km |
| Jan 12, 2015 | 0 km NE of Wauregan, Connecticut | M3.3 | 84 km | 5 km |
| Oct 2, 1994 | 1 km NW of Hardwick, Massachusetts | M3.3 | 103 km | 10 km |
| Jun 16, 2000 | 5 km NE of Granville, Massachusetts | M3.3 | 58 km | 10 km |
| Dec 13, 2009 | 15 km N of Medusa, New York | M3.2 | 149 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 | 149 km | 9 km |
| Aug 3, 2025 | 0 km W of Little Ferry, New Jersey | M3.0 | 126 km | 10 km |
| Oct 28, 1991 | 3 km WNW of Stamford, Connecticut | M3.0 | 81 km | 10 km |
| Oct 21, 2009 | 15 km N of Medusa, New York | M2.9 | 149 km | 7 km |
| Aug 5, 2025 | 1 km N of Hillsdale, New Jersey | M2.8 | 115 km | 12 km |
| Mar 10, 1992 | 2 km SW of Napeague, New York | M2.8 | 94 km | 10 km |
| Apr 12, 1991 | 2 km ENE of North Castle, New York | M2.7 | 80 km | 9 km |
| Feb 18, 2009 | 15 km N of Medusa, New York | M2.7 | 149 km | 9 km |
| Feb 20, 2009 | 15 km SSW of Altamont, New York | M2.7 | 148 km | 8 km |
| Aug 14, 2014 | 6 km SW of Deep River Center, Connecticut | M2.7 | 42 km | 4 km |
| Oct 27, 2001 | 1 km NNW of Manhattan, New York | M2.6 | 126 km | 5 km |
| Aug 22, 2000 | 2 km WSW of Brewster Hill, New York | M2.6 | 64 km | 7 km |
| Jan 13, 2015 | 2 km E of Wauregan, Connecticut | M2.6 | 86 km | 9 km |
| Dec 13, 2009 | 14 km N of Medusa, New York | M2.6 | 149 km | 10 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 | 291 km |
| 2014 | Arthur | Category 1 | 75 mph | 296 km |
| 1991 | Bob | Category 2 | 109 mph | 116 km |
| 1985 | Gloria | Category 1 | 86 mph | 36 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
234 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 12 fatalities, 944 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 29, 1995 | EF4 | 82 km | 11.5 mi | 3 |
| Jul 10, 1989 | EF4 | 23 km | 3.0 mi | 0 |
| Oct 3, 1979 | EF4 | 38 km | 11.3 mi | 3 |
| Jun 1, 2011 | EF3 | 59 km | 37.6 mi | 3 |
| Sep 13, 1971 | EF3 | 85 km | 0.5 mi | 0 |
| Jul 29, 1971 | EF3 | 14 km | 0.1 mi | 0 |
| May 24, 1962 | EF3 | 19 km | 11.6 mi | 1 |
| May 10, 1954 | EF3 | 51 km | 0.3 mi | 0 |
| Aug 21, 1951 | EF3 | 33 km | 0.1 mi | 0 |
| May 15, 2018 | EF2 | 67 km | 1.2 mi | 0 |
| Jul 12, 2006 | EF2 | 100 km | 10.1 mi | 0 |
| Jun 23, 2001 | EF2 | 31 km | 0.5 mi | 0 |
| May 18, 2000 | EF2 | 93 km | 0.2 mi | 0 |
| Aug 8, 1999 | EF2 | 72 km | 4.0 mi | 0 |
| Jul 3, 1997 | EF2 | 71 km | 4.5 mi | 0 |
| Jul 3, 1997 | EF2 | 70 km | 3.7 mi | 0 |
| Jul 10, 1989 | EF2 | 19 km | 5.0 mi | 0 |
| Jul 10, 1989 | EF2 | 85 km | 0.2 mi | 0 |
| Jul 10, 1989 | EF2 | 68 km | 0.5 mi | 0 |
| Jul 10, 1989 | EF2 | 46 km | 10.0 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 | — | 89 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: CRESCENT BOW FIRE (1,068 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | CRESCENT BOW FIRE | 1,068 | 78 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 3.7 in | Coldest |
| February | 28°F (-2°C) | 3.4 in | Driest |
| March | 37°F (3°C) | 4.0 in | |
| April | 48°F (9°C) | 4.3 in | |
| May | 58°F (15°C) | 4.3 in | Wettest |
| June | 67°F (20°C) | 4.0 in | |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 71°F (21°C) | 3.9 in | |
| September | 63°F (17°C) | 4.0 in | |
| October | 52°F (11°C) | 3.9 in | |
| November | 42°F (6°C) | 4.3 in | |
| December | 32°F (-0°C) | 4.1 in |
Plantsville has a seasonal temperature swing of 45°F / from 28°F in January to 73°F in July. Total annual precipitation is 47.9 inches, with May being the wettest month (4.3") and February the driest (3.4").