All Countries
Weather & Climate in Plymouth, NH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Plymouth has a cool climate with an average annual temperature of 43°F (6°C). Winters average 18°F in January while summers reach 67°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 44.5 inches. The area receives 68.3 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 886 feet.
Temperature
18°F Jan (-8°C)
67°F Jul (20°C)
| Annual Average | 43.4°F |
| 20% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 886 ft (270 m) |
| Area | 3.7 sq mi (9.6 km²) |
| Population Density | 829/sq mi |
| Coordinates | 43.7388°N, 71.7026°W |
| Timezone | America/New_York |
| County | Grafton County County |
| Nearest Airport | Eastern Slopes Regional (FRY) 41 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 81.8 / 100 |
| Social Vulnerability | 27.4 / 100 |
| Community Resilience | 72.7 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Avalanche | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
40 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 | 86 km | 16 km |
| Jun 16, 1995 | 8 km N of Lisbon, New Hampshire | M3.8 | 63 km | 5 km |
| Jan 27, 2025 | 9 km SE of York Harbor, Maine | M3.8 | 118 km | 11 km |
| Aug 21, 1996 | 12 km N of Livermore, New Hampshire | M3.8 | 57 km | 10 km |
| Jan 17, 2000 | 4 km NNE of Dixfield, Maine | M3.6 | 137 km | 16 km |
| Jan 3, 2000 | 4 km W of Leeds, Maine | M3.5 | 138 km | 10 km |
| Oct 6, 1992 | 1 km SW of Canterbury, New Hampshire | M3.4 | 47 km | 5 km |
| Sep 26, 2010 | 2 km SW of Canterbury, New Hampshire | M3.2 | 47 km | 5 km |
| Jan 10, 1999 | 2 km ENE of Merrimac, Massachusetts | M3.1 | 116 km | 2 km |
| Jan 10, 1999 | 1 km NNE of Merrimac, Massachusetts | M3.0 | 115 km | 2 km |
| Nov 20, 1994 | 4 km WNW of Norway, Maine | M3.0 | 104 km | 5 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 92 km | 1 km |
| Apr 25, 2023 | 4 km SW of Center Sandwich, New Hampshire | M2.9 | 18 km | 8 km |
| Feb 4, 2022 | 0 km SSW of Gorham, New Hampshire | M2.9 | 83 km | 8 km |
| Jun 7, 2010 | 29 km SE of York Beach, Maine | M2.9 | 138 km | 10 km |
| May 14, 2007 | 5 km ESE of Benson, Vermont | M2.8 | 124 km | 8 km |
| Mar 23, 1992 | 5 km SE of Hill, New Hampshire | M2.8 | 27 km | 5 km |
| Mar 21, 2016 | 4 km ESE of Warner, New Hampshire | M2.8 | 53 km | 7 km |
| Mar 9, 2008 | 25 km SE of York Beach, Maine | M2.8 | 134 km | 0 km |
| Sep 28, 2002 | 2 km N of Wilton, New Hampshire | M2.8 | 97 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 | 160 km |
| 1985 | Gloria | Category 1 | 86 mph | 223 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
101 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 20 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 25, 1969 | EF3 | 15 km | 5.7 mi | 0 |
| May 20, 1963 | EF3 | 99 km | 14.0 mi | 0 |
| Jul 24, 2008 | EF2 | 73 km | 50.5 mi | 1 |
| Jul 6, 1999 | EF2 | 57 km | 7.5 mi | 0 |
| May 31, 1998 | EF2 | 81 km | 0.5 mi | 0 |
| Jul 3, 1997 | EF2 | 89 km | 2.0 mi | 0 |
| Jun 22, 1981 | EF2 | 55 km | 8.7 mi | 0 |
| May 3, 1976 | EF2 | 97 km | 1.0 mi | 0 |
| May 11, 1973 | EF2 | 27 km | 0.5 mi | 0 |
| Jul 3, 1972 | EF2 | 42 km | 1.0 mi | 0 |
| Oct 10, 1966 | EF2 | 82 km | 0.2 mi | 0 |
| Aug 11, 1966 | EF2 | 79 km | 1.0 mi | 0 |
| Aug 11, 1966 | EF2 | 43 km | 9.0 mi | 0 |
| Jul 18, 1963 | EF2 | 43 km | 0.1 mi | 0 |
| Jun 9, 1963 | EF2 | 84 km | 10.0 mi | 0 |
| May 14, 1963 | EF2 | 75 km | 8.7 mi | 0 |
| Jul 9, 1962 | EF2 | 83 km | 7.7 mi | 0 |
| Jul 9, 1962 | EF2 | 87 km | 7.6 mi | 0 |
| Jul 2, 1961 | EF2 | 71 km | 2.0 mi | 0 |
| Oct 24, 1955 | EF2 | 76 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 2.9 in | Coldest |
| February | 20°F (-7°C) | 2.8 in | Driest |
| March | 30°F (-1°C) | 3.1 in | |
| April | 42°F (5°C) | 3.3 in | |
| May | 54°F (12°C) | 3.9 in | |
| June | 62°F (17°C) | 3.7 in | |
| July | 67°F (20°C) | 3.8 in | Warmest |
| August | 65°F (18°C) | 4.0 in | |
| September | 57°F (14°C) | 3.2 in | |
| October | 46°F (8°C) | 3.7 in | |
| November | 35°F (2°C) | 4.1 in | Wettest |
| December | 23°F (-5°C) | 3.6 in |
Plymouth has a seasonal temperature swing of 49°F / from 18°F in January to 67°F in July. Total annual precipitation is 42.1 inches, with November being the wettest month (4.1") and February the driest (2.8").