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Weather & Climate in Antietam, MD
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Antietam experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 31°F in January while summers reach 74°F in July. The area gets 293 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 43.5 inches. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 351 feet.
Temperature
31°F Jan (-0°C)
74°F Jul (23°C)
| Annual Average | 52.9°F |
| 2% below US avg | |
| January Average | 31°F (-0°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 351 ft (107 m) |
| Area | 0.2 sq mi (0.4 km²) |
| Population Density | 340/sq mi |
| Coordinates | 39.4151°N, 77.7365°W |
| Timezone | America/New_York |
| County | Jefferson County County |
| Nearest Airport | Eastern Wv Regional/Shepherd Field (MRB) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 47.8 / 100 |
| Social Vulnerability | 15.8 / 100 |
| Community Resilience | 52.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
16 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Jul 16, 2010 | 5 km NNW of Barnesville, Maryland | M3.6 | 33 km | 7 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 114 km | 27 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 99 km | 2 km |
| Jan 17, 2016 | 3 km NE of Ranson, West Virginia | M3.0 | 13 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 94 km | 1 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 91 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 100 km | 1 km |
| Mar 15, 1993 | 5 km W of Columbia, Maryland | M2.7 | 75 km | 5 km |
| Oct 28, 1994 | 1 km E of Mount Vernon, Maryland | M2.7 | 99 km | — |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 137 km | 5 km |
| Jan 13, 1990 | 6 km ENE of Eldersburg, Maryland | M2.6 | 74 km | 5 km |
| Jun 25, 2021 | 2 km SE of Woodlawn, Maryland | M2.6 | 89 km | 3 km |
| Jul 27, 1997 | 5 km SSE of Culpeper, Virginia | M2.5 | 112 km | 19 km |
| Jun 25, 2001 | 8 km S of Remington, Virginia | M2.5 | 107 km | 5 km |
| Sep 29, 1997 | Virginia | M2.5 | 71 km | 3 km |
| Mar 10, 1993 | 3 km WSW of Columbia, Maryland | M2.5 | 76 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
1 hurricane (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2011 | Irene | Category 1 | 75 mph | 279 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
368 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 3 fatalities, 221 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 24, 2001 | EF4 | 96 km | 10.0 mi | 0 |
| Sep 17, 2004 | EF3 | 100 km | 9.0 mi | 0 |
| Sep 24, 2001 | EF3 | 85 km | 17.5 mi | 2 |
| Jul 19, 1996 | EF3 | 66 km | 2.2 mi | 0 |
| May 22, 1983 | EF3 | 52 km | 2.0 mi | 0 |
| Jun 7, 1980 | EF3 | 84 km | 1.5 mi | 0 |
| Sep 5, 1979 | EF3 | 91 km | 17.9 mi | 1 |
| Apr 1, 1973 | EF3 | 77 km | 9.8 mi | 0 |
| Jun 9, 1961 | EF3 | 99 km | 0.1 mi | 0 |
| Apr 16, 1961 | EF3 | 73 km | 0.1 mi | 0 |
| Apr 5, 1952 | EF3 | 78 km | 17.5 mi | 0 |
| Apr 19, 2019 | EF2 | 55 km | 2.9 mi | 0 |
| Nov 2, 2018 | EF2 | 49 km | 5.5 mi | 0 |
| Sep 17, 2004 | EF2 | 46 km | 5.0 mi | 0 |
| Sep 17, 2004 | EF2 | 71 km | 15.0 mi | 0 |
| Sep 17, 2004 | EF2 | 26 km | 2.0 mi | 0 |
| Sep 17, 2004 | EF2 | 80 km | 13.0 mi | 0 |
| Sep 17, 2004 | EF2 | 93 km | 4.0 mi | 0 |
| Sep 17, 2004 | EF2 | 89 km | 8.0 mi | 0 |
| Sep 17, 2004 | EF2 | 16 km | 3.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
11 wildfires (100+ acres) recorded within 100 km. Largest: WAITES RUN (5,496 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | WAITES RUN | 5,496 | 85 km |
| 2012 | NEIGHBOR MTN FIRE | 1,986 | 97 km |
| 2011 | SMITH RUN FIRE | 1,908 | 77 km |
| 2020 | UNNAMED | 1,572 | 94 km |
| 2012 | POINT 2 | 1,126 | 79 km |
| 2024 | ROCKY BRANCH | 1,018 | 95 km |
| 2014 | BEAR DEN | 945 | 93 km |
| 2019 | KENNEDY PEAK | 769 | 96 km |
| 2012 | WOLF GAP | 710 | 98 km |
| 1984 | UNNAMED | 696 | 73 km |
| 2022 | UNNAMED | 618 | 96 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 2.7 in | Coldest |
| February | 34°F (1°C) | 2.5 in | Driest |
| March | 42°F (6°C) | 3.3 in | |
| April | 52°F (11°C) | 3.3 in | |
| May | 62°F (17°C) | 4.0 in | Wettest |
| June | 70°F (21°C) | 3.7 in | |
| July | 74°F (23°C) | 3.6 in | Warmest |
| August | 73°F (23°C) | 3.5 in | |
| September | 67°F (19°C) | 3.4 in | |
| October | 55°F (13°C) | 3.2 in | |
| November | 45°F (7°C) | 3.2 in | |
| December | 36°F (2°C) | 2.8 in |
Antietam has a seasonal temperature swing of 43°F / from 31°F in January to 74°F in July. Total annual precipitation is 39.3 inches, with May being the wettest month (4.0") and February the driest (2.5").