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Weather & Climate in Thomaston, ME
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Thomaston experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 21°F in January while summers reach 68°F in July. The area gets 234 sunny days per year, above the national average. Annual precipitation totals 56.2 inches (wetter than the 38-inch national average). The area receives 68.7 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 128 feet.
Temperature
21°F Jan (-6°C)
68°F Jul (20°C)
| Annual Average | 45.5°F |
| 16% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 234 days/yr |
Geography
| Elevation | 128 ft (39 m) |
| Area | 2.1 sq mi (5.5 km²) |
| Population Density | 953/sq mi |
| Coordinates | 44.0819°N, 69.1795°W |
| Timezone | America/New_York |
| County | Knox County County |
| Nearest Airport | Knox County Regional (RKD) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 28.6 / 100 |
| Social Vulnerability | 16.3 / 100 |
| Community Resilience | 99.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Coastal Flood | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
37 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Oct 16, 2012 | 5 km W of Hollis Center, Maine | M4.7 | 130 km | 16 km |
| Feb 26, 1999 | 0 km NW of China, Maine | M3.8 | 52 km | 3 km |
| Jan 17, 2000 | 4 km NNE of Dixfield, Maine | M3.6 | 114 km | 16 km |
| Jan 3, 2000 | 4 km W of Leeds, Maine | M3.5 | 83 km | 10 km |
| Jan 14, 2023 | 7 km ESE of Dedham, Maine | M3.3 | 81 km | 10 km |
| Oct 25, 2001 | 4 km S of Howland, Maine | M3.3 | 131 km | 9 km |
| Sep 7, 2000 | 7 km WSW of Liberty, Maine | M3.2 | 34 km | 5 km |
| Sep 5, 1994 | 13 km NNE of Monhegan, Maine | M3.1 | 25 km | 5 km |
| Nov 20, 1994 | 4 km WNW of Norway, Maine | M3.0 | 115 km | 5 km |
| Dec 25, 1999 | 4 km NE of Saint Albans, Maine | M3.0 | 97 km | 5 km |
| Mar 30, 2010 | 7 km WSW of Dedham, Maine | M3.0 | 74 km | 4 km |
| Aug 17, 2022 | 3 km SE of Centerville, Maine | M3.0 | 140 km | 5 km |
| Jun 7, 2010 | 29 km SE of York Beach, Maine | M2.9 | 149 km | 10 km |
| Jan 17, 2021 | 4 km ESE of Centerville, Maine | M2.9 | 140 km | 5 km |
| Jul 28, 2024 | 6 km W of Gardiner, Maine | M2.8 | 57 km | 8 km |
| Feb 12, 1995 | 1 km NNE of Turner, Maine | M2.8 | 88 km | 5 km |
| Aug 11, 2022 | Maine | M2.8 | 141 km | 4 km |
| Aug 11, 2022 | 4 km E of Centerville, Maine | M2.8 | 142 km | 6 km |
| Feb 17, 1995 | 7 km WSW of Greene, Maine | M2.7 | 85 km | 8 km |
| Mar 25, 2011 | 6 km NNE of Burlington, Maine | M2.7 | 145 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 1.
| Year | Name | Category | Max Wind | Closest |
| 2008 | Kyle | Category 1 | 81 mph | 241 km |
| 1991 | Bob | Category 2 | 98 mph | 196 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
33 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 4 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 9, 2000 | EF2 | 92 km | 3.0 mi | 0 |
| Jul 8, 1996 | EF2 | 67 km | 1.5 mi | 0 |
| Nov 7, 1971 | EF2 | 88 km | 4.1 mi | 0 |
| Jul 31, 1971 | EF2 | 97 km | 1.9 mi | 0 |
| Jul 31, 1971 | EF2 | 73 km | 2.0 mi | 0 |
| Jul 31, 1971 | EF2 | 85 km | 0.5 mi | 0 |
| Sep 4, 1961 | EF2 | 90 km | 0.5 mi | 0 |
| Jul 15, 2014 | EF1 | 94 km | 2.8 mi | 0 |
| Nov 24, 2005 | EF1 | 59 km | 3.8 mi | 0 |
| Jun 21, 1997 | EF1 | 77 km | 0.2 mi | 0 |
| Jun 28, 1991 | EF1 | 99 km | 0.7 mi | 0 |
| Jun 18, 1989 | EF1 | 100 km | 1.3 mi | 0 |
| Jul 14, 1988 | EF1 | 87 km | 0.2 mi | 0 |
| Aug 14, 1977 | EF1 | 47 km | 0.3 mi | 0 |
| Oct 3, 1970 | EF1 | 82 km | 9.5 mi | 0 |
| Aug 8, 1969 | EF1 | 11 km | 1.0 mi | 0 |
| Jul 1, 1968 | EF1 | 50 km | 2.3 mi | 0 |
| Jul 1, 1968 | EF1 | 33 km | 0.3 mi | 0 |
| Jun 17, 1967 | EF1 | 80 km | 1.0 mi | 0 |
| Jul 13, 1966 | EF1 | 76 km | 0.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2008 | MAINE | Avalanche | 3.6 m | — | 52 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 3.7 in | Coldest |
| February | 24°F (-5°C) | 3.4 in | |
| March | 33°F (0°C) | 4.0 in | |
| April | 43°F (6°C) | 4.3 in | |
| May | 53°F (12°C) | 4.1 in | |
| June | 62°F (17°C) | 3.5 in | |
| July | 68°F (20°C) | 3.1 in | Warmest, Driest |
| August | 66°F (19°C) | 3.2 in | |
| September | 59°F (15°C) | 3.5 in | |
| October | 48°F (9°C) | 4.3 in | |
| November | 39°F (4°C) | 5.1 in | Wettest |
| December | 27°F (-3°C) | 4.7 in |
Thomaston has a seasonal temperature swing of 47°F / from 21°F in January to 68°F in July. Total annual precipitation is 46.8 inches, with November being the wettest month (5.1") and July the driest (3.1").