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Weather & Climate in Underhill Flats, VT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Underhill Flats has a cool climate with an average annual temperature of 38°F (4°C). Winters average 13°F in January while summers reach 62°F in July. The area gets 251 sunny days per year, above the national average. Annual precipitation totals 81.1 inches (wetter than the 38-inch national average). The area receives 234.9 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 31. The city sits at an elevation of 706 feet.
Temperature
13°F Jan (-10°C)
62°F Jul (17°C)
| Annual Average | 38.4°F |
| 29% below US avg | |
| January Average | 13°F (-10°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 706 ft (215 m) |
| Area | 0.8 sq mi (1.9 km²) |
| Population Density | 716/sq mi |
| Coordinates | 44.5233°N, 72.9462°W |
| Timezone | America/New_York |
| County | Lamoille County County |
| Nearest Airport | Patrick Leahy Burlington International (BTV) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 31.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 18.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 82.1 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
62 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 | 60 km | 5 km |
| Oct 10, 2012 | 7 km ESE of Verchères, Canada | M3.9 | 139 km | 9 km |
| Jul 30, 1993 | 1 km NE of Salaberry-de-Valleyfield, Canada | M3.9 | 124 km | 8 km |
| Jul 5, 1991 | 7 km WSW of Sainte-Martine, Canada | M3.8 | 109 km | 18 km |
| Oct 6, 2000 | 1 km WSW of Ormstown, Canada | M3.8 | 108 km | 18 km |
| Nov 16, 1993 | 5 km SSE of Saint-Édouard, Canada | M3.8 | 85 km | 17 km |
| Apr 20, 2000 | 7 km WSW of Newcomb, New York | M3.8 | 122 km | 5 km |
| Jun 16, 1995 | 8 km N of Lisbon, New Hampshire | M3.8 | 86 km | 5 km |
| Aug 21, 1996 | 12 km N of Livermore, New Hampshire | M3.8 | 132 km | 10 km |
| Jan 9, 2006 | 2 km ESE of Franklin, Canada | M3.7 | 93 km | 13 km |
| Apr 8, 2003 | 17 km ESE of Saint Regis Falls, New York | M3.7 | 111 km | 10 km |
| Apr 20, 2002 | 5 km NNW of Au Sable Forks, New York | M3.7 | 59 km | 5 km |
| Jan 13, 2020 | 5 km SW of Franklin, Canada | M3.4 | 96 km | 6 km |
| May 17, 2021 | 5 km SW of L'Épiphanie, Canada | M3.3 | 150 km | 12 km |
| Jun 9, 1998 | 3 km N of Dannemora, New York | M3.3 | 66 km | 5 km |
| Aug 20, 1995 | 4 km S of Chambly, Canada | M3.3 | 102 km | 18 km |
| Jun 1, 2002 | 3 km SW of Boisbriand, Canada | M3.2 | 139 km | 18 km |
| Aug 24, 2011 | 13 km ENE of Saint Regis Falls, New York | M3.2 | 115 km | 5 km |
| May 24, 2002 | 6 km N of Au Sable Forks, New York | M3.1 | 58 km | 10 km |
| May 6, 2020 | 9 km SE of Bedford, Canada | M3.1 | 60 km | 14 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 1.
| Year | Name | Category | Max Wind | Closest |
| 1991 | Bob | Category 1 | — | 291 km |
| 1985 | Gloria | Category 1 | 86 mph | 292 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
41 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 11 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 8, 1983 | EF2 | 16 km | 0.2 mi | 0 |
| Aug 3, 1970 | EF2 | 37 km | 4.5 mi | 0 |
| Aug 11, 1966 | EF2 | 89 km | 9.0 mi | 0 |
| Jul 4, 1963 | EF2 | 46 km | 5.9 mi | 0 |
| May 20, 1962 | EF2 | 33 km | 1.8 mi | 0 |
| Jun 13, 1961 | EF2 | 47 km | 7.9 mi | 0 |
| Jun 24, 1960 | EF2 | 12 km | 2.0 mi | 0 |
| Jun 18, 1957 | EF2 | 53 km | 3.0 mi | 0 |
| May 6, 1952 | EF2 | 86 km | 4.9 mi | 0 |
| Jul 18, 2022 | EF1 | 57 km | 0.9 mi | 0 |
| Mar 26, 2021 | EF1 | 57 km | 0.7 mi | 0 |
| Jun 5, 2010 | EF1 | 43 km | 2.1 mi | 0 |
| May 9, 2009 | EF1 | 61 km | 0.6 mi | 0 |
| Jul 18, 2008 | EF1 | 22 km | 0.3 mi | 0 |
| Sep 3, 1993 | EF1 | 80 km | 4.0 mi | 0 |
| Aug 6, 1989 | EF1 | 55 km | 1.5 mi | 0 |
| May 19, 1982 | EF1 | 90 km | 0.1 mi | 0 |
| Jun 22, 1973 | EF1 | 21 km | 0.1 mi | 0 |
| Jun 11, 1973 | EF1 | 15 km | 0.1 mi | 0 |
| Aug 9, 1972 | EF1 | 92 km | 3.6 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: FLAT ROCK FIRE (658 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | FLAT ROCK FIRE | 658 | 67 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-10°C) | 2.4 in | Coldest |
| February | 17°F (-8°C) | 2.1 in | Driest |
| March | 28°F (-2°C) | 2.8 in | |
| April | 41°F (5°C) | 3.3 in | |
| May | 54°F (12°C) | 3.8 in | |
| June | 62°F (17°C) | 4.1 in | |
| July | 62°F (17°C) | 4.4 in | |
| August | 65°F (18°C) | 4.8 in | Warmest, Wettest |
| September | 57°F (14°C) | 4.0 in | |
| October | 46°F (8°C) | 3.7 in | |
| November | 35°F (2°C) | 3.9 in | |
| December | 22°F (-6°C) | 3.0 in |
Underhill Flats has a seasonal temperature swing of 52°F / from 13°F in January to 65°F in August. Total annual precipitation is 42.1 inches, with August being the wettest month (4.8") and February the driest (2.1").