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Weather & Climate in Altmar, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Altmar has a cool climate with an average annual temperature of 45°F (7°C). Winters average 20°F in January while summers reach 68°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 48.0 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 540 feet.
Temperature
20°F Jan (-7°C)
68°F Jul (20°C)
| Annual Average | 44.7°F |
| 17% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 540 ft (165 m) |
| Area | 2.1 sq mi (5.4 km²) |
| Population Density | 107/sq mi |
| Coordinates | 43.5124°N, 76.0056°W |
| Timezone | America/New_York |
| County | Oswego County County |
| Nearest Airport | Syracuse Hancock International (SYR) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 67.6 / 100 |
| Social Vulnerability | 40.5 / 100 |
| Community Resilience | 87.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jun 17, 1991 | 7 km NE of Worcester, New York | M4.0 | 146 km | 5 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 149 km | 5 km |
| Apr 23, 2023 | New York | M3.6 | 39 km | 9 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 34 km | 5 km |
| Jul 31, 1997 | 0 km WSW of Lyons Falls, New York | M3.2 | 53 km | 5 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 129 km | 18 km |
| Oct 13, 1997 | 18 km NW of Cranberry Lake, New York | M3.0 | 126 km | 4 km |
| Mar 2, 1995 | 3 km ENE of Tupper Lake, New York | M3.0 | 150 km | 4 km |
| Aug 11, 2007 | 4 km N of Kingston, Canada | M2.6 | 93 km | 4 km |
| Apr 14, 2023 | 1 km W of Adams Center, New York | M2.6 | 39 km | 6 km |
| Apr 11, 2007 | 6 km NNE of Sodus Point, New York | M2.6 | 80 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
94 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 8 fatalities, 21 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 7, 2023 | EF3 | 40 km | 16.0 mi | 0 |
| May 2, 1983 | EF3 | 39 km | 3.0 mi | 0 |
| May 2, 1983 | EF3 | 63 km | 20.0 mi | 1 |
| May 2, 1983 | EF3 | 51 km | 3.0 mi | 0 |
| Jun 2, 1969 | EF3 | 80 km | 17.5 mi | 0 |
| Jul 16, 2024 | EF2 | 54 km | 5.3 mi | 0 |
| Jul 8, 2014 | EF2 | 65 km | 2.5 mi | 4 |
| Aug 21, 2011 | EF2 | 80 km | 7.9 mi | 0 |
| May 16, 2009 | EF2 | 87 km | 5.7 mi | 0 |
| Jul 23, 1990 | EF2 | 55 km | 17.0 mi | 0 |
| Aug 15, 1986 | EF2 | 92 km | 0.2 mi | 1 |
| Sep 18, 1977 | EF2 | 80 km | 2.0 mi | 0 |
| Jul 16, 2024 | EF1 | 52 km | 1.4 mi | 1 |
| Jul 16, 2024 | EF1 | 41 km | 6.5 mi | 0 |
| Jul 16, 2024 | EF1 | 93 km | 4.1 mi | 0 |
| Jul 16, 2024 | EF1 | 85 km | 0.7 mi | 0 |
| Jul 15, 2024 | EF1 | 96 km | 8.7 mi | 0 |
| Jul 10, 2024 | EF1 | 15 km | 2.2 mi | 0 |
| Jun 22, 2024 | EF1 | 96 km | 2.0 mi | 0 |
| Aug 7, 2023 | EF1 | 67 km | 1.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: DRY MARSH (1,018 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | DRY MARSH | 1,018 | 85 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 3.9 in | Coldest |
| February | 22°F (-6°C) | 3.2 in | Driest |
| March | 31°F (-0°C) | 3.2 in | |
| April | 43°F (6°C) | 3.6 in | |
| May | 55°F (13°C) | 3.5 in | |
| June | 64°F (18°C) | 3.7 in | |
| July | 68°F (20°C) | 3.4 in | Warmest |
| August | 68°F (20°C) | 4.1 in | |
| September | 60°F (15°C) | 4.3 in | |
| October | 49°F (9°C) | 4.1 in | |
| November | 38°F (3°C) | 5.0 in | Wettest |
| December | 26°F (-3°C) | 4.5 in |
Altmar has a seasonal temperature swing of 48°F / from 20°F in January to 68°F in July. Total annual precipitation is 46.3 inches, with November being the wettest month (5.0") and February the driest (3.2").