Weather & Climate in Mount Ivy, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mount Ivy experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 26°F in January while summers reach 72°F in July. Annual precipitation totals 47.2 inches (wetter than the 38-inch national average). The area receives 39.5 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 37. 84% of days have good air quality. The city sits at an elevation of 409 feet.
Temperature
26°F Jan (-3°C)
72°F Jul (22°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 409 ft (125 m) |
| Area | 1.5 sq mi (3.8 km²) |
| Population Density | 5,383/sq mi |
| Coordinates | 41.1927°N, 74.0296°W |
| Timezone | America/New_York |
| County | Rockland County County |
| Nearest Airport | New York Stewart International (SWF) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
| Good Days % | 84.2% |
| Unhealthy Days | 5 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 88.4 / 100 |
| Social Vulnerability | 68.2 / 100 |
| Community Resilience | 69.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
20 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 5, 2024 | 2024 Tewksbury, New Jersey Earthquake | M4.8 | 83 km | 3 km |
| Apr 5, 2024 | 7 km WSW of Gladstone, New Jersey | M3.7 | 82 km | 4 km |
| Jun 16, 2000 | 5 km NE of Granville, Massachusetts | M3.3 | 142 km | 10 km |
| Aug 26, 2003 | 4 km NNW of Milford, New Jersey | M3.1 | 112 km | 3 km |
| Jan 9, 1992 | 4 km WNW of Robertsville, New Jersey | M3.1 | 96 km | 8 km |
| Oct 28, 1991 | 3 km WNW of Stamford, Connecticut | M3.0 | 40 km | 10 km |
| Aug 3, 2025 | 0 km W of Little Ferry, New Jersey | M3.0 | 38 km | 10 km |
| Feb 3, 2009 | 1 km ESE of Victory Gardens, New Jersey | M3.0 | 55 km | 0 km |
| May 24, 2024 | 6 km E of Califon, New Jersey | M2.9 | 81 km | 7 km |
| Apr 27, 2024 | 7 km WSW of Gladstone, New Jersey | M2.9 | 82 km | 5 km |
| Aug 5, 2025 | 1 km N of Hillsdale, New Jersey | M2.8 | 20 km | 12 km |
| Apr 12, 1991 | 2 km ENE of North Castle, New York | M2.7 | 32 km | 9 km |
| Aug 14, 2014 | 6 km SW of Deep River Center, Connecticut | M2.7 | 129 km | 4 km |
| Oct 27, 2001 | 1 km NNW of Manhattan, New York | M2.6 | 45 km | 5 km |
| Aug 14, 2015 | 3 km SE of Mendham, New Jersey | M2.6 | 67 km | 8 km |
| Aug 22, 2000 | 2 km WSW of Brewster Hill, New York | M2.6 | 42 km | 7 km |
| May 1, 2024 | 1 km NW of Gladstone, New Jersey | M2.6 | 75 km | 5 km |
| Apr 10, 2024 | 5 km WSW of Gladstone, New Jersey | M2.6 | 80 km | 9 km |
| Apr 5, 2024 | 6 km ESE of Califon, New Jersey | M2.6 | 83 km | 6 km |
| Jan 15, 1992 | 5 km NNE of Tuxedo Park, New York | M2.5 | 12 km | 7 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 | 109 mph | 183 km |
| 1985 | Gloria | Category 1 | 86 mph | 90 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
222 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 13 fatalities, 296 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 10, 1989 | EF4 | 97 km | 3.0 mi | 0 |
| May 31, 1998 | EF3 | 90 km | 20.0 mi | 0 |
| Jul 14, 1988 | EF3 | 45 km | 7.2 mi | 0 |
| Mar 21, 1976 | EF3 | 99 km | 0.5 mi | 0 |
| May 28, 1973 | EF3 | 69 km | 0.4 mi | 0 |
| May 28, 1973 | EF3 | 59 km | 0.4 mi | 0 |
| Jul 29, 1971 | EF3 | 91 km | 0.1 mi | 0 |
| May 24, 1962 | EF3 | 86 km | 11.6 mi | 1 |
| May 15, 2018 | EF2 | 45 km | 1.2 mi | 0 |
| Jul 29, 2009 | EF2 | 54 km | 7.4 mi | 0 |
| Aug 8, 2007 | EF2 | 63 km | 5.9 mi | 0 |
| Jul 12, 2006 | EF2 | 19 km | 10.1 mi | 0 |
| May 27, 2001 | EF2 | 97 km | 1.5 mi | 0 |
| May 18, 2000 | EF2 | 70 km | 0.2 mi | 0 |
| Sep 7, 1998 | EF2 | 67 km | 0.2 mi | 0 |
| May 31, 1998 | EF2 | 97 km | 3.0 mi | 0 |
| May 31, 1998 | EF2 | 99 km | 2.0 mi | 0 |
| Jul 10, 1989 | EF2 | 88 km | 5.0 mi | 0 |
| Jul 10, 1989 | EF2 | 92 km | 10.0 mi | 0 |
| Jul 10, 1989 | EF2 | 39 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | - | 89 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | - | - | 93 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
13 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (23,000 acres, 1985).
| Year | Name | Acres Burned | Distance |
| 1985 | UNNAMED | 23,000 | 7 km |
| 2016 | 16 MILE | 7,896 | 94 km |
| 2024 | JENNINGS CREEK | 5,069 | 22 km |
| 2015 | ROOSA GAP | 2,747 | 59 km |
| 2008 | UNNAMED | 2,224 | 63 km |
| 2016 | SAMS POINT FIRE-VERKEERDER FIRE | 1,929 | 60 km |
| 2006 | CHERRYTOWN FIRE | 943 | 79 km |
| 1988 | UNNAMED | 833 | 10 km |
| 1985 | UNNAMED | 737 | 97 km |
| 2016 | BEAR TOWN | 649 | 100 km |
| 2016 | SHERWOOD | 642 | 6 km |
| 2024 | WHITEHOUSE | 607 | 87 km |
| 1999 | WORTHINGTO | 514 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 3.1 in | Coldest |
| February | 28°F (-2°C) | 2.6 in | Driest |
| March | 36°F (2°C) | 3.9 in | |
| April | 48°F (9°C) | 4.0 in | |
| May | 58°F (14°C) | 3.9 in | |
| June | 67°F (19°C) | 4.2 in | |
| July | 72°F (22°C) | 4.8 in | Warmest |
| August | 70°F (21°C) | 4.9 in | Wettest |
| September | 63°F (17°C) | 3.7 in | |
| October | 52°F (11°C) | 4.5 in | |
| November | 41°F (5°C) | 3.6 in | |
| December | 32°F (0°C) | 4.1 in |
Mount Ivy has a seasonal temperature swing of 46°F / from 26°F in January to 72°F in July. Total annual precipitation is 47.2 inches, with August being the wettest month (4.9") and February the driest (2.6").