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Weather & Climate in Green Harbor, MA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Green Harbor experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 30°F in January while summers reach 73°F in July. The area gets 259 sunny days per year, above the national average. Annual precipitation totals 52.3 inches (wetter than the 38-inch national average). The area receives 50.9 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 37. The city sits at an elevation of 13 feet.
Temperature
30°F Jan (-1°C)
73°F Jul (23°C)
| Annual Average | 51.3°F |
| 5% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 13 ft (4 m) |
| Area | 0.3 sq mi (0.9 km²) |
| Population Density | 3,800/sq mi |
| Coordinates | 42.0660°N, 70.6487°W |
| Timezone | America/New_York |
| County | Essex County County |
| Nearest Airport | General Edward Lawrence Logan International (BOS) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.6 / 100 |
| Social Vulnerability | 34.2 / 100 |
| Community Resilience | 95.6 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
23 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Jan 27, 2025 | 9 km SE of York Harbor, Maine | M3.8 | 111 km | 11 km |
| Oct 2, 1994 | 6 km W of Hardwick, Massachusetts | M3.7 | 138 km | 10 km |
| Jan 12, 2015 | 0 km NE of Wauregan, Connecticut | M3.3 | 110 km | 5 km |
| Oct 2, 1994 | 1 km NW of Hardwick, Massachusetts | M3.3 | 133 km | 10 km |
| Mar 22, 1996 | 2 km NE of Bristol, Rhode Island | M3.1 | 65 km | 12 km |
| Jan 10, 1999 | 2 km ENE of Merrimac, Massachusetts | M3.1 | 90 km | 2 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 113 km | 1 km |
| Mar 12, 2002 | 52 km E of Chatham, Massachusetts | M3.0 | 120 km | 1 km |
| Jan 10, 1999 | 1 km NNE of Merrimac, Massachusetts | M3.0 | 91 km | 2 km |
| Jul 22, 2003 | 72 km NNE of Provincetown, Massachusetts | M3.0 | 97 km | 10 km |
| Jun 7, 2010 | 29 km SE of York Beach, Maine | M2.9 | 110 km | 10 km |
| Jan 8, 1998 | 52 km ENE of Rockport, Massachusetts | M2.9 | 101 km | 25 km |
| Mar 9, 2008 | 25 km SE of York Beach, Maine | M2.8 | 109 km | 0 km |
| Sep 28, 2002 | 2 km N of Wilton, New Hampshire | M2.8 | 126 km | 5 km |
| Oct 13, 1999 | 2 km E of Littleton Common, Massachusetts | M2.7 | 84 km | 2 km |
| Sep 30, 1991 | 0 km SSE of Bedford, New Hampshire | M2.7 | 120 km | 4 km |
| Feb 15, 2018 | 0 km SE of East Kingston, New Hampshire | M2.7 | 100 km | 7 km |
| Oct 11, 1990 | 5 km NNE of The Pinehills, Massachusetts | M2.7 | 16 km | 13 km |
| Jan 13, 2015 | 2 km E of Wauregan, Connecticut | M2.6 | 108 km | 9 km |
| Apr 22, 1996 | 3 km NE of North Westport, Massachusetts | M2.6 | 55 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
5 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 | 222 km |
| 1996 | Edouard | Category 1 | 81 mph | 254 km |
| 1991 | Bob | Category 2 | 104 mph | 61 km |
| 1985 | Gloria | Category 1 | 86 mph | 179 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
116 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 74 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 29, 1974 | EF3 | 76 km | 0.1 mi | 0 |
| Jun 9, 1953 | EF3 | 93 km | 28.0 mi | 0 |
| Aug 18, 2023 | EF2 | 82 km | 9.1 mi | 0 |
| Jul 28, 2014 | EF2 | 48 km | 1.9 mi | 0 |
| May 21, 2006 | EF2 | 96 km | 0.1 mi | 0 |
| Aug 7, 1986 | EF2 | 74 km | 4.0 mi | 0 |
| Jul 21, 1972 | EF2 | 93 km | 7.6 mi | 0 |
| Aug 28, 1970 | EF2 | 56 km | 1.0 mi | 0 |
| Nov 18, 1967 | EF2 | 23 km | 0.1 mi | 0 |
| Aug 31, 1966 | EF2 | 98 km | 1.0 mi | 0 |
| Aug 28, 1965 | EF2 | 90 km | 2.0 mi | 0 |
| May 20, 1963 | EF2 | 87 km | 0.3 mi | 0 |
| May 20, 1963 | EF2 | 94 km | 1.5 mi | 0 |
| Jul 2, 1961 | EF2 | 99 km | 5.1 mi | 0 |
| Aug 25, 1958 | EF2 | 59 km | 1.0 mi | 0 |
| Jul 11, 1958 | EF2 | 72 km | 1.5 mi | 0 |
| Nov 21, 1956 | EF2 | 94 km | 0.1 mi | 0 |
| Nov 21, 1956 | EF2 | 87 km | 0.8 mi | 0 |
| Nov 21, 1956 | EF2 | 45 km | 0.1 mi | 0 |
| Dec 18, 1951 | EF2 | 78 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: THE RANGE (760 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | THE RANGE | 760 | 96 km |
| 2008 | NOMANS AERIAL RX | 546 | 91 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 4.3 in | Coldest |
| February | 31°F (-1°C) | 3.8 in | |
| March | 37°F (3°C) | 4.5 in | |
| April | 46°F (8°C) | 4.2 in | |
| May | 56°F (13°C) | 3.5 in | |
| June | 65°F (18°C) | 3.5 in | |
| July | 73°F (23°C) | 3.2 in | Warmest, Driest |
| August | 70°F (21°C) | 3.7 in | |
| September | 63°F (17°C) | 4.2 in | |
| October | 53°F (11°C) | 4.1 in | |
| November | 44°F (7°C) | 4.6 in | Wettest |
| December | 35°F (1°C) | 4.3 in |
Green Harbor has a seasonal temperature swing of 43°F / from 30°F in January to 73°F in July. Total annual precipitation is 47.8 inches, with November being the wettest month (4.6") and July the driest (3.2").