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Weather & Climate in Hemlock, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hemlock experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 71°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 37.3 inches. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 912 feet.
Temperature
25°F Jan (-4°C)
71°F Jul (21°C)
| Annual Average | 48.2°F |
| 11% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 912 ft (278 m) |
| Area | 1.9 sq mi (4.8 km²) |
| Population Density | 396/sq mi |
| Coordinates | 42.7938°N, 77.6074°W |
| Timezone | America/New_York |
| County | Livingston County County |
| Nearest Airport | Frederick Douglass/Greater Rochester International (ROC) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 56.4 / 100 |
| Social Vulnerability | 43.3 / 100 |
| Community Resilience | 83.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
19 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Feb 6, 2023 | 1 km NE of West Seneca, New York | M3.8 | 96 km | 6 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 118 km | 18 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 147 km | 5 km |
| Feb 3, 2001 | 6 km W of Bath, New York | M3.2 | 53 km | 0 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 113 km | 5 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 140 km | 18 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 102 km | 5 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 113 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 120 km | 6 km |
| Jun 5, 2009 | 4 km SSE of Attica, New York | M2.9 | 52 km | 5 km |
| Mar 28, 2005 | 16 km NW of Virgil, Canada | M2.8 | 148 km | 7 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 83 km | 6 km |
| Dec 21, 2009 | 10 km NNE of Olcott, New York | M2.7 | 111 km | 8 km |
| Mar 29, 2020 | 11 km N of Lyndonville, New York | M2.6 | 93 km | 5 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 46 km | 5 km |
| Apr 11, 2007 | 6 km NNE of Sodus Point, New York | M2.6 | 79 km | 7 km |
| Jul 11, 2017 | 11 km NNW of Barker, New York | M2.5 | 107 km | 5 km |
| Jan 25, 1999 | New York | M2.5 | 21 km | 3 km |
| Feb 13, 2014 | 34 km N of Lyndonville, New York | M2.5 | 114 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
90 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 5 fatalities, 8 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 2, 1983 | EF3 | 91 km | 20.0 mi | 1 |
| Jun 2, 1969 | EF3 | 77 km | 17.5 mi | 0 |
| Jul 24, 1967 | EF3 | 96 km | 11.4 mi | 0 |
| Aug 30, 1955 | EF3 | 76 km | 1.0 mi | 0 |
| Jul 28, 2022 | EF2 | 62 km | 10.0 mi | 0 |
| Aug 21, 2011 | EF2 | 74 km | 7.9 mi | 0 |
| Apr 28, 2002 | EF2 | 67 km | 6.5 mi | 0 |
| Jun 2, 1998 | EF2 | 53 km | 15.0 mi | 0 |
| Sep 3, 1993 | EF2 | 65 km | 3.5 mi | 0 |
| Aug 28, 1990 | EF2 | 69 km | 2.5 mi | 0 |
| Jul 30, 1987 | EF2 | 96 km | 1.5 mi | 0 |
| May 2, 1983 | EF2 | 97 km | 9.8 mi | 0 |
| May 2, 1972 | EF2 | 75 km | 12.0 mi | 0 |
| Aug 23, 1971 | EF2 | 90 km | 0.1 mi | 0 |
| Sep 6, 2024 | EF1 | 87 km | 6.0 mi | 0 |
| Jul 10, 2024 | EF1 | 88 km | 2.8 mi | 0 |
| Sep 19, 2022 | EF1 | 24 km | 1.9 mi | 0 |
| Sep 12, 2021 | EF1 | 14 km | 0.8 mi | 0 |
| May 3, 2018 | EF1 | 38 km | 1.1 mi | 0 |
| Jul 20, 2017 | EF1 | 60 km | 4.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: DRY MARSH (1,018 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | DRY MARSH | 1,018 | 73 km |
| 1994 | MOHAWK POOL | 507 | 75 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.9 in | |
| February | 23°F (-5°C) | 1.7 in | Coldest, Driest |
| March | 32°F (0°C) | 2.3 in | |
| April | 44°F (6°C) | 2.9 in | |
| May | 55°F (13°C) | 3.2 in | |
| June | 64°F (18°C) | 3.9 in | Wettest |
| July | 71°F (21°C) | 3.4 in | Warmest |
| August | 67°F (19°C) | 3.5 in | |
| September | 59°F (15°C) | 3.8 in | |
| October | 49°F (9°C) | 3.1 in | |
| November | 39°F (4°C) | 3.1 in | |
| December | 28°F (-2°C) | 2.4 in |
Hemlock has a seasonal temperature swing of 47°F / from 23°F in February to 71°F in July. Total annual precipitation is 35.1 inches, with June being the wettest month (3.9") and February the driest (1.7").