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Weather & Climate in Bethlehem, NH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Bethlehem has a cool climate with an average annual temperature of 42°F (6°C). Winters average 16°F in January while summers reach 66°F in July. The area gets 251 sunny days per year, above the national average. Annual precipitation totals 41.0 inches. The area receives 100.9 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 1,466 feet.
Temperature
16°F Jan (-9°C)
66°F Jul (19°C)
| Annual Average | 42.1°F |
| 22% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 1,466 ft (447 m) |
| Area | 1.6 sq mi (4.2 km²) |
| Population Density | 673/sq mi |
| Coordinates | 44.2787°N, 71.6890°W |
| Timezone | America/New_York |
| County | Essex County County |
| Nearest Airport | Mount Washington Regional (HIE) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 3.2 / 100 |
| Social Vulnerability | 14.8 / 100 |
| Community Resilience | 38.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| 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 | 112 km | 16 km |
| Jun 16, 1995 | 8 km N of Lisbon, New Hampshire | M3.8 | 18 km | 5 km |
| Aug 21, 1996 | 12 km N of Livermore, New Hampshire | M3.8 | 29 km | 10 km |
| Jan 17, 2000 | 4 km NNE of Dixfield, Maine | M3.6 | 104 km | 16 km |
| Jan 3, 2000 | 4 km W of Leeds, Maine | M3.5 | 121 km | 10 km |
| Oct 6, 1992 | 1 km SW of Canterbury, New Hampshire | M3.4 | 107 km | 5 km |
| Sep 26, 2010 | 2 km SW of Canterbury, New Hampshire | M3.2 | 107 km | 5 km |
| May 6, 2020 | 9 km SE of Bedford, Canada | M3.1 | 129 km | 14 km |
| Nov 20, 1994 | 4 km WNW of Norway, Maine | M3.0 | 87 km | 5 km |
| Apr 15, 2010 | 7 km WNW of Valcourt, Canada | M3.0 | 150 km | 18 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 148 km | 1 km |
| Apr 25, 2023 | 4 km SW of Center Sandwich, New Hampshire | M2.9 | 58 km | 8 km |
| Feb 4, 2022 | 0 km SSW of Gorham, New Hampshire | M2.9 | 43 km | 8 km |
| May 14, 2007 | 5 km ESE of Benson, Vermont | M2.8 | 141 km | 8 km |
| Mar 23, 1992 | 5 km SE of Hill, New Hampshire | M2.8 | 87 km | 5 km |
| Mar 21, 2016 | 4 km ESE of Warner, New Hampshire | M2.8 | 113 km | 7 km |
| Feb 12, 1995 | 1 km NNE of Turner, Maine | M2.8 | 115 km | 5 km |
| Jul 28, 2024 | 6 km W of Gardiner, Maine | M2.8 | 146 km | 8 km |
| Sep 30, 1991 | 0 km SSE of Bedford, New Hampshire | M2.7 | 150 km | 4 km |
| Feb 13, 1998 | 1 km SSE of Tamworth, New Hampshire | M2.7 | 59 km | 8 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 |
| 1991 | Bob | Category 1 | — | 210 km |
| 1985 | Gloria | Category 1 | 86 mph | 280 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
79 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 14 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 25, 1969 | EF3 | 46 km | 5.7 mi | 0 |
| May 11, 1973 | EF2 | 82 km | 0.5 mi | 0 |
| Jul 3, 1972 | EF2 | 98 km | 1.0 mi | 0 |
| Aug 11, 1966 | EF2 | 45 km | 9.0 mi | 0 |
| Jul 18, 1963 | EF2 | 85 km | 0.1 mi | 0 |
| Jul 16, 2024 | EF1 | 63 km | 1.8 mi | 0 |
| Jul 1, 2017 | EF1 | 74 km | 1.5 mi | 0 |
| Jul 1, 2017 | EF1 | 76 km | 0.3 mi | 0 |
| Jul 1, 2017 | EF1 | 81 km | 2.5 mi | 0 |
| Aug 21, 2011 | EF1 | 78 km | 2.7 mi | 0 |
| Jun 1, 2011 | EF1 | 81 km | 0.3 mi | 0 |
| Jul 21, 2010 | EF1 | 98 km | 2.0 mi | 0 |
| Jun 5, 2010 | EF1 | 69 km | 2.1 mi | 0 |
| Jun 5, 2010 | EF1 | 98 km | 4.2 mi | 0 |
| Aug 21, 2009 | EF1 | 87 km | 16.4 mi | 0 |
| May 9, 2009 | EF1 | 63 km | 0.6 mi | 0 |
| May 31, 2002 | EF1 | 89 km | 2.1 mi | 0 |
| Jun 17, 2001 | EF1 | 76 km | 0.4 mi | 0 |
| Jul 18, 2000 | EF1 | 85 km | 0.5 mi | 0 |
| Aug 13, 1999 | EF1 | 93 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 16°F (-9°C) | 2.7 in | Coldest |
| February | 18°F (-8°C) | 2.2 in | Driest |
| March | 28°F (-2°C) | 2.8 in | |
| April | 40°F (5°C) | 2.9 in | |
| May | 53°F (12°C) | 3.6 in | |
| June | 62°F (16°C) | 3.8 in | |
| July | 66°F (19°C) | 3.9 in | Warmest |
| August | 64°F (18°C) | 4.5 in | Wettest |
| September | 56°F (13°C) | 3.6 in | |
| October | 45°F (7°C) | 3.3 in | |
| November | 34°F (1°C) | 3.4 in | |
| December | 21°F (-6°C) | 3.4 in |
Bethlehem has a seasonal temperature swing of 51°F / from 16°F in January to 66°F in July. Total annual precipitation is 40.0 inches, with August being the wettest month (4.5") and February the driest (2.2").