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Weather & Climate in Thomaston, CT

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Thomaston experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 24°F in January while summers reach 70°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 54.3 inches (wetter than the 38-inch national average). The area receives 59.1 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 641 feet.

Temperature

24°F Jan (-4°C) 70°F Jul (21°C)
Annual Average47.3°F
12% below US avg
January Average24°F (-4°C)
July Average70°F (21°C)
Sunny Days271 days/yr

Geography

Elevation641 ft (195 m)
Area1.0 sq mi (2.7 km²)
Population Density1,728/sq mi
Coordinates41.6768°N, 73.0830°W
TimezoneAmerica/New_York
CountyNaugatuck Valley Planning Region County
Nearest AirportBradley International (BDL)
27 miles away

Precipitation & Snow

Annual Rainfall 54.3"
43% above US avg
Snowfall 59.1"
Wettest Month (Nov) 4.37"
Driest Month (Feb) 3.43"

Air Quality

AQI Median39.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score93.2 / 100
Social Vulnerability35.7 / 100
Community Resilience77.2 / 100

Hazard Breakdown

Tornado Relatively Moderate
Hurricane Relatively High
Earthquake Relatively Low
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 Relatively High
Drought Relatively Low
Cold Wave Relatively Moderate
Landslide Relatively Low
Coastal Flood Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

26 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.

Oct 2, 1994 6 km W of Hardwick, Massachusetts M3.7 100 km 10 km
Jan 12, 2015 0 km NE of Wauregan, Connecticut M3.3 98 km 5 km
Jun 16, 2000 5 km NE of Granville, Massachusetts M3.3 52 km 10 km
Oct 2, 1994 1 km NW of Hardwick, Massachusetts M3.3 104 km 10 km
Dec 13, 2009 15 km N of Medusa, New York M3.2 131 km 10 km
May 18, 2009 15 km N of Medusa, New York M3.1 131 km 9 km
Jul 24, 2007 12 km SSW of Altamont, New York M3.1 134 km 15 km
Aug 3, 2025 0 km W of Little Ferry, New Jersey M3.0 122 km 10 km
Oct 28, 1991 3 km WNW of Stamford, Connecticut M3.0 79 km 10 km
Oct 21, 2009 15 km N of Medusa, New York M2.9 130 km 7 km
Aug 5, 2025 1 km N of Hillsdale, New Jersey M2.8 109 km 12 km
Mar 10, 1992 2 km SW of Napeague, New York M2.8 113 km 10 km
Aug 27, 2011 5 km WSW of Altamont, New York M2.8 139 km 22 km
Mar 22, 2009 9 km SW of Altamont, New York M2.8 136 km 16 km
Apr 12, 1991 2 km ENE of North Castle, New York M2.7 75 km 9 km
Aug 25, 2011 5 km WSW of Altamont, New York M2.7 139 km 18 km
Feb 18, 2009 15 km N of Medusa, New York M2.7 130 km 9 km
Feb 20, 2009 15 km SSW of Altamont, New York M2.7 130 km 8 km
Aug 14, 2014 6 km SW of Deep River Center, Connecticut M2.7 61 km 4 km
Oct 27, 2001 1 km NNW of Manhattan, New York M2.6 123 km 5 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 135 km
1985 Gloria Category 1 86 mph 34 km
Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

244 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 16 fatalities, 997 injuries.

Date Rating Distance Path Fatalities
May 29, 1995 EF4 65 km 11.5 mi 3
Jul 10, 1989 EF4 36 km 3.0 mi 0
Oct 3, 1979 EF4 41 km 11.3 mi 3
Aug 28, 1973 EF4 87 km 9.8 mi 4
Jun 1, 2011 EF3 55 km 37.6 mi 3
Jun 16, 1974 EF3 89 km 49.1 mi 0
Sep 13, 1971 EF3 80 km 0.5 mi 0
Jul 29, 1971 EF3 14 km 0.1 mi 0
May 24, 1962 EF3 14 km 11.6 mi 1
May 10, 1954 EF3 58 km 0.3 mi 0
Aug 21, 1951 EF3 50 km 0.1 mi 0
May 15, 2018 EF2 54 km 1.2 mi 0
Jul 12, 2006 EF2 94 km 10.1 mi 0
Jul 21, 2003 EF2 95 km 1.3 mi 0
Jul 21, 2003 EF2 94 km 1.5 mi 0
Jun 23, 2001 EF2 14 km 0.5 mi 0
May 18, 2000 EF2 75 km 0.2 mi 0
Aug 8, 1999 EF2 89 km 4.0 mi 0
Jul 3, 1997 EF2 56 km 4.5 mi 0
Jul 3, 1997 EF2 56 km 3.7 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 — 98 km
Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

3 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (2,224 acres, 2008).

Year Name Acres Burned Distance
2008 UNNAMED 2,224 99 km
2012 CRESCENT BOW FIRE 1,068 91 km
1988 UNNAMED 833 100 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 24°F (-4°C) 3.7 in Coldest
February 26°F (-3°C) 3.4 in Driest
March 35°F (2°C) 4.0 in
April 46°F (8°C) 4.1 in
May 57°F (14°C) 4.3 in
June 65°F (18°C) 4.1 in
July 70°F (21°C) 4.0 in Warmest
August 69°F (20°C) 4.2 in
September 61°F (16°C) 4.1 in
October 50°F (10°C) 4.0 in
November 40°F (5°C) 4.4 in Wettest
December 30°F (-1°C) 4.2 in

Thomaston has a seasonal temperature swing of 46°F / from 24°F in January to 70°F in July. Total annual precipitation is 48.4 inches, with November being the wettest month (4.4") and February the driest (3.4").

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