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Weather & Climate in Groton, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Groton has a cool climate with an average annual temperature of 45°F (7°C). Winters average 21°F in January while summers reach 68°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 39.5 inches. The area receives 64.4 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 1,122 feet.
Temperature
21°F Jan (-6°C)
68°F Jul (20°C)
| Annual Average | 45.2°F |
| 16% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,122 ft (342 m) |
| Area | 1.7 sq mi (4.5 km²) |
| Population Density | 1,134/sq mi |
| Coordinates | 42.5834°N, 76.3599°W |
| Timezone | America/New_York |
| County | Tompkins County County |
| Nearest Airport | Ithaca Tompkins International (ITH) 8 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 73.9 / 100 |
| Social Vulnerability | 30.9 / 100 |
| Community Resilience | 83.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
10 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 | 138 km | 5 km |
| Apr 23, 2023 | New York | M3.6 | 145 km | 9 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 127 km | 5 km |
| Feb 3, 2001 | 6 km W of Bath, New York | M3.2 | 89 km | 0 km |
| Jul 31, 1997 | 0 km WSW of Lyons Falls, New York | M3.2 | 141 km | 5 km |
| Jun 10, 2025 | 10 km NW of Forksville, Pennsylvania | M2.8 | 116 km | 8 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 147 km | 5 km |
| Apr 14, 2023 | 1 km W of Adams Center, New York | M2.6 | 145 km | 6 km |
| Apr 11, 2007 | 6 km NNE of Sodus Point, New York | M2.6 | 96 km | 7 km |
| Jan 25, 1999 | New York | M2.5 | 123 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
147 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 10 fatalities, 51 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 31, 1998 | EF3 | 60 km | 62.0 mi | 0 |
| May 2, 1983 | EF3 | 67 km | 15.0 mi | 0 |
| May 2, 1983 | EF3 | 72 km | 3.0 mi | 0 |
| May 2, 1983 | EF3 | 69 km | 20.0 mi | 1 |
| May 2, 1983 | EF3 | 66 km | 2.0 mi | 0 |
| Jun 2, 1969 | EF3 | 54 km | 17.5 mi | 0 |
| Aug 30, 1955 | EF3 | 54 km | 1.0 mi | 0 |
| Jul 16, 2024 | EF2 | 99 km | 5.3 mi | 0 |
| Jun 13, 2018 | EF2 | 100 km | 5.2 mi | 0 |
| Jul 8, 2014 | EF2 | 74 km | 2.5 mi | 4 |
| Aug 21, 2011 | EF2 | 64 km | 7.9 mi | 0 |
| Apr 28, 2011 | EF2 | 48 km | 7.4 mi | 0 |
| Apr 27, 2011 | EF2 | 53 km | 0.9 mi | 0 |
| May 16, 2009 | EF2 | 39 km | 5.7 mi | 0 |
| May 31, 1998 | EF2 | 62 km | 1.0 mi | 0 |
| Aug 28, 1990 | EF2 | 43 km | 2.5 mi | 0 |
| Jul 23, 1990 | EF2 | 88 km | 17.0 mi | 0 |
| Oct 14, 1989 | EF2 | 49 km | 2.0 mi | 2 |
| Sep 18, 1977 | EF2 | 61 km | 2.0 mi | 0 |
| Sep 19, 1954 | EF2 | 85 km | 1.0 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 | 54 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 2.4 in | Coldest |
| February | 23°F (-5°C) | 2.2 in | Driest |
| March | 32°F (0°C) | 2.7 in | |
| April | 44°F (7°C) | 3.3 in | |
| May | 55°F (13°C) | 3.3 in | |
| June | 64°F (18°C) | 3.9 in | |
| July | 68°F (20°C) | 3.7 in | Warmest |
| August | 67°F (19°C) | 3.4 in | |
| September | 59°F (15°C) | 4.0 in | Wettest |
| October | 48°F (9°C) | 3.3 in | |
| November | 39°F (4°C) | 3.4 in | |
| December | 27°F (-3°C) | 3.0 in |
Groton has a seasonal temperature swing of 48°F / from 21°F in January to 68°F in July. Total annual precipitation is 38.6 inches, with September being the wettest month (4.0") and February the driest (2.2").