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Weather & Climate in Armstrong, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Armstrong has a cool climate with an average annual temperature of 44°F (7°C). Winters average 13°F in January while summers reach 70°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 32.9 inches. The area receives 39.7 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 1,235 feet.
Temperature
13°F Jan (-10°C)
70°F Jul (21°C)
| Annual Average | 43.8°F |
| 19% below US avg | |
| January Average | 13°F (-10°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,235 ft (376 m) |
| Area | 0.9 sq mi (2.3 km²) |
| Population Density | 806/sq mi |
| Coordinates | 43.3944°N, 94.4834°W |
| Timezone | America/Chicago |
| County | Emmet County County |
| Nearest Airport | Fort Dodge Regional (FOD) 60 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 42.8 / 100 |
| Social Vulnerability | 33.6 / 100 |
| Community Resilience | 67.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.8.
| Apr 25, 2017 | Near Mankato, Minnesota | M2.8 | 96 km | 0 km |
| Jun 30, 2021 | 4 km E of Rembrandt, Iowa | M2.7 | 81 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
556 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 27 fatalities, 487 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Oct 14, 1966 | EF5 | 95 km | 9.7 mi | 6 |
| Apr 9, 2011 | EF4 | 80 km | 3.2 mi | 0 |
| Jun 17, 2010 | EF4 | 71 km | 16.9 mi | 1 |
| Jun 28, 1979 | EF4 | 86 km | 14.9 mi | 3 |
| May 4, 1977 | EF4 | 100 km | 2.0 mi | 0 |
| Apr 30, 1967 | EF4 | 87 km | 38.7 mi | 5 |
| Apr 30, 1967 | EF4 | 90 km | 20.1 mi | 6 |
| Aug 29, 1964 | EF4 | 57 km | 15.8 mi | 0 |
| May 10, 1953 | EF4 | 86 km | 26.6 mi | 0 |
| Jun 12, 2013 | EF3 | 86 km | 6.2 mi | 0 |
| Jun 17, 2010 | EF3 | 92 km | 18.2 mi | 0 |
| Aug 24, 2006 | EF3 | 99 km | 33.0 mi | 1 |
| Aug 1, 2006 | EF3 | 59 km | 1.5 mi | 0 |
| Jun 11, 2004 | EF3 | 71 km | 6.1 mi | 0 |
| Jun 18, 1994 | EF3 | 77 km | 6.0 mi | 0 |
| Jun 7, 1984 | EF3 | 30 km | 9.0 mi | 0 |
| Jun 7, 1984 | EF3 | 96 km | 14.0 mi | 0 |
| May 17, 1982 | EF3 | 99 km | 46.0 mi | 0 |
| Sep 20, 1980 | EF3 | 60 km | 1.5 mi | 0 |
| Jun 28, 1979 | EF3 | 25 km | 15.9 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: DEWEYS PASTURE (641 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | DEWEYS PASTURE | 641 | 42 km |
| 2024 | LINCOLN WPA RX | 575 | 73 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-10°C) | 0.7 in | Coldest, Driest |
| February | 20°F (-7°C) | 0.7 in | |
| March | 32°F (0°C) | 1.9 in | |
| April | 46°F (8°C) | 3.0 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 69°F (21°C) | 4.3 in | Wettest |
| July | 70°F (21°C) | 4.0 in | Warmest |
| August | 70°F (21°C) | 3.9 in | |
| September | 62°F (16°C) | 3.1 in | |
| October | 49°F (10°C) | 2.2 in | |
| November | 33°F (0°C) | 1.6 in | |
| December | 19°F (-7°C) | 0.9 in |
Armstrong has a seasonal temperature swing of 57°F / from 13°F in January to 70°F in July. Total annual precipitation is 30.0 inches, with June being the wettest month (4.3") and January the driest (0.7").