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Weather & Climate in Hermon, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hermon has a cool climate with an average annual temperature of 45°F (7°C). Winters average 17°F in January while summers reach 69°F in July. The area gets 270 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 38.2 inches. The area receives 77.3 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 498 feet.
Temperature
17°F Jan (-8°C)
69°F Jul (21°C)
| Annual Average | 44.6°F |
| 17% below US avg | |
| January Average | 17°F (-8°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 498 ft (152 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 1,231/sq mi |
| Coordinates | 44.4671°N, 75.2312°W |
| Timezone | America/New_York |
| County | St. Lawrence County County |
| Nearest Airport | Ogdensburg International (OGS) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 77.9 / 100 |
| Social Vulnerability | 64.7 / 100 |
| Community Resilience | 70.4 / 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 | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
77 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Apr 20, 2002 | 8 km NNW of Au Sable Forks, New York | M5.3 | 122 km | 5 km |
| May 17, 1991 | 7 km WNW of Rigaud, Canada | M4.4 | 132 km | 18 km |
| Apr 18, 1998 | 4 km N of Plantagenet, Canada | M4.1 | 124 km | 18 km |
| Nov 17, 1992 | 16 km ENE of Saint-André-Avellin, Canada | M4.0 | 147 km | 18 km |
| Feb 25, 2006 | 4 km NE of Thurso, Canada | M4.0 | 129 km | 11 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 124 km | 8 km |
| Mar 16, 2011 | 6 km ENE of Hawkesbury, Canada | M3.9 | 139 km | 10 km |
| Sep 18, 2011 | 1 km E of Thurso, Canada | M3.8 | 126 km | 5 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 97 km | 5 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 135 km | 18 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 121 km | 18 km |
| Nov 6, 2012 | Ontario-Quebec border region, Canada | M3.7 | 137 km | 11 km |
| Jan 9, 2006 | 2 km ESE of Franklin, Canada | M3.7 | 123 km | 13 km |
| Apr 20, 2002 | 5 km NNW of Au Sable Forks, New York | M3.7 | 122 km | 5 km |
| Apr 8, 2003 | 17 km ESE of Saint Regis Falls, New York | M3.7 | 73 km | 10 km |
| Sep 12, 1995 | 8 km S of Brownsburg-Chatham, Canada | M3.7 | 142 km | 18 km |
| Apr 23, 2023 | New York | M3.6 | 92 km | 9 km |
| Jan 13, 2020 | 5 km SW of Franklin, Canada | M3.4 | 116 km | 6 km |
| Jun 9, 1998 | 3 km N of Dannemora, New York | M3.3 | 124 km | 5 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 120 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
24 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 4 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 15, 1986 | EF2 | 34 km | 0.2 mi | 1 |
| Sep 19, 1954 | EF2 | 46 km | 0.1 mi | 0 |
| May 6, 1952 | EF2 | 99 km | 4.9 mi | 0 |
| Jul 16, 2024 | EF1 | 92 km | 4.1 mi | 0 |
| Jul 8, 2014 | EF1 | 81 km | 12.3 mi | 0 |
| Aug 1, 2005 | EF1 | 89 km | 1.5 mi | 0 |
| Sep 3, 1993 | EF1 | 70 km | 6.0 mi | 0 |
| Jul 10, 1989 | EF1 | 34 km | 1.7 mi | 0 |
| Jul 26, 1986 | EF1 | 79 km | 1.0 mi | 0 |
| May 31, 1985 | EF1 | 40 km | 5.0 mi | 0 |
| Aug 7, 1972 | EF1 | 0 km | 4.9 mi | 0 |
| Jul 12, 1969 | EF1 | 95 km | 0.8 mi | 0 |
| Jul 1, 1959 | EF1 | 94 km | 0.1 mi | 0 |
| Aug 11, 2024 | EF0 | 31 km | 0.1 mi | 0 |
| Oct 2, 2004 | EF0 | 99 km | 0.1 mi | 0 |
| Jun 9, 2004 | EF0 | 41 km | 2.0 mi | 0 |
| Jun 9, 2004 | EF0 | 23 km | 0.2 mi | 0 |
| Jun 1, 2004 | EF0 | 91 km | 0.1 mi | 0 |
| Aug 5, 2003 | EF0 | 62 km | 0.1 mi | 0 |
| Jun 21, 1993 | EF0 | 30 km | 0.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 15.0 m (49 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1908 | NOTRE DAME DE LA SALETTE | Meteorological | 15.0 m | 33 | 148 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-8°C) | 2.4 in | Coldest |
| February | 18°F (-8°C) | 2.1 in | Driest |
| March | 29°F (-2°C) | 2.5 in | |
| April | 42°F (6°C) | 3.0 in | |
| May | 55°F (13°C) | 3.2 in | |
| June | 63°F (17°C) | 3.3 in | |
| July | 69°F (21°C) | 3.5 in | Warmest |
| August | 66°F (19°C) | 4.0 in | |
| September | 58°F (14°C) | 4.2 in | Wettest |
| October | 47°F (8°C) | 3.3 in | |
| November | 36°F (2°C) | 3.6 in | |
| December | 22°F (-5°C) | 3.0 in |
Hermon has a seasonal temperature swing of 53°F / from 17°F in January to 69°F in July. Total annual precipitation is 38.0 inches, with September being the wettest month (4.2") and February the driest (2.1").