Weather & Climate in Marlborough, MA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Marlborough experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 26°F in January while summers reach 74°F in July. Annual precipitation totals 49.7 inches (wetter than the 38-inch national average). The area receives 45.7 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 37. 86% of days have good air quality. The city sits at an elevation of 453 feet.
Temperature
26°F Jan (-3°C)
74°F Jul (23°C)
| Annual Average | 49.9°F |
| 8% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 453 ft (138 m) |
| Area | 22.1 sq mi (57.2 km²) |
| Population Density | 1,985/sq mi |
| Coordinates | 42.3496°N, 71.5472°W |
| Timezone | America/New_York |
| County | Middlesex County County |
| Nearest Airport | Worcester Regional (ORH) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
| Good Days % | 85.8% |
| Unhealthy Days | 0 |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.0 / 100 |
| Social Vulnerability | 15.8 / 100 |
| Community Resilience | 89.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
29 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 | 113 km | 11 km |
| Oct 2, 1994 | 6 km W of Hardwick, Massachusetts | M3.7 | 60 km | 10 km |
| Oct 6, 1992 | 1 km SW of Canterbury, New Hampshire | M3.4 | 108 km | 5 km |
| Jan 12, 2015 | 0 km NE of Wauregan, Connecticut | M3.3 | 73 km | 5 km |
| Jun 16, 2000 | 5 km NE of Granville, Massachusetts | M3.3 | 108 km | 10 km |
| Oct 2, 1994 | 1 km NW of Hardwick, Massachusetts | M3.3 | 55 km | 10 km |
| Sep 26, 2010 | 2 km SW of Canterbury, New Hampshire | M3.2 | 108 km | 5 km |
| Mar 22, 1996 | 2 km NE of Bristol, Rhode Island | M3.1 | 78 km | 12 km |
| Jan 10, 1999 | 2 km ENE of Merrimac, Massachusetts | M3.1 | 72 km | 2 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 78 km | 1 km |
| Jan 10, 1999 | 1 km NNE of Merrimac, Massachusetts | M3.0 | 71 km | 2 km |
| Jun 7, 2010 | 29 km SE of York Beach, Maine | M2.9 | 126 km | 10 km |
| Jan 8, 1998 | 52 km ENE of Rockport, Massachusetts | M2.9 | 136 km | 25 km |
| Sep 28, 2002 | 2 km N of Wilton, New Hampshire | M2.8 | 60 km | 5 km |
| Mar 9, 2008 | 25 km SE of York Beach, Maine | M2.8 | 122 km | 0 km |
| Mar 21, 2016 | 4 km ESE of Warner, New Hampshire | M2.8 | 103 km | 7 km |
| Mar 23, 1992 | 5 km SE of Hill, New Hampshire | M2.8 | 128 km | 5 km |
| Oct 13, 1999 | 2 km E of Littleton Common, Massachusetts | M2.7 | 24 km | 2 km |
| Oct 11, 1990 | 5 km NNE of The Pinehills, Massachusetts | M2.7 | 93 km | 13 km |
| Sep 30, 1991 | 0 km SSE of Bedford, New Hampshire | M2.7 | 66 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2014 | Arthur | Category 1 | 75 mph | 285 km |
| 1991 | Bob | Category 2 | 104 mph | 90 km |
| 1985 | Gloria | Category 1 | 86 mph | 115 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
232 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 100 fatalities, 1,339 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 9, 1953 | EF4 | 53 km | 34.9 mi | 94 |
| Jun 22, 1981 | EF3 | 43 km | 7.1 mi | 0 |
| Sep 29, 1974 | EF3 | 38 km | 0.1 mi | 0 |
| Sep 13, 1971 | EF3 | 92 km | 0.5 mi | 0 |
| Oct 3, 1970 | EF3 | 51 km | 35.4 mi | 1 |
| May 20, 1963 | EF3 | 76 km | 14.0 mi | 0 |
| May 10, 1954 | EF3 | 90 km | 0.3 mi | 0 |
| Jun 9, 1953 | EF3 | 84 km | 1.5 mi | 0 |
| Jun 9, 1953 | EF3 | 27 km | 28.0 mi | 0 |
| Aug 18, 2023 | EF2 | 61 km | 9.1 mi | 0 |
| Jul 28, 2014 | EF2 | 44 km | 1.9 mi | 0 |
| Jul 24, 2008 | EF2 | 91 km | 50.5 mi | 1 |
| Jul 11, 2006 | EF2 | 73 km | 2.9 mi | 0 |
| May 21, 2006 | EF2 | 85 km | 0.1 mi | 0 |
| May 31, 1998 | EF2 | 83 km | 0.5 mi | 0 |
| Jul 3, 1997 | EF2 | 71 km | 2.0 mi | 0 |
| Aug 7, 1986 | EF2 | 65 km | 4.0 mi | 0 |
| Aug 10, 1979 | EF2 | 48 km | 9.7 mi | 2 |
| Jul 24, 1975 | EF2 | 97 km | 0.3 mi | 0 |
| Aug 27, 1972 | EF2 | 80 km | 1.0 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 | 19 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 3.6 in | Coldest |
| February | 28°F (-2°C) | 3.3 in | Driest |
| March | 36°F (2°C) | 4.6 in | |
| April | 48°F (9°C) | 4.4 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 68°F (20°C) | 4.2 in | |
| July | 74°F (23°C) | 4.0 in | Warmest |
| August | 72°F (22°C) | 4.4 in | |
| September | 64°F (18°C) | 3.9 in | |
| October | 52°F (11°C) | 5.1 in | Wettest |
| November | 41°F (5°C) | 3.8 in | |
| December | 32°F (-0°C) | 4.9 in |
Marlborough has a seasonal temperature swing of 48°F / from 26°F in January to 74°F in July. Total annual precipitation is 49.7 inches, with October being the wettest month (5.1") and February the driest (3.3").