All Countries
Weather & Climate in St. Ansgar, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Ansgar has a cool climate with an average annual temperature of 45°F (7°C). Winters average 15°F in January while summers reach 72°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 37.6 inches. The area receives 39.6 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 1,180 feet.
Temperature
15°F Jan (-10°C)
72°F Jul (22°C)
| Annual Average | 45.3°F |
| 16% below US avg | |
| January Average | 15°F (-10°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,180 ft (360 m) |
| Area | 1.0 sq mi (2.7 km²) |
| Population Density | 1,061/sq mi |
| Coordinates | 43.3799°N, 92.9178°W |
| Timezone | America/Chicago |
| County | Mitchell County County |
| Nearest Airport | Northeast Iowa Regional (CCY) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 37.7 / 100 |
| Social Vulnerability | 17.5 / 100 |
| Community Resilience | 85.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.8.
| Apr 25, 2017 | Near Mankato, Minnesota | M2.8 | 125 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
587 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 51 fatalities, 979 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 25, 2008 | EF5 | 92 km | 41.0 mi | 9 |
| May 15, 1968 | EF5 | 70 km | 62.1 mi | 13 |
| Oct 14, 1966 | EF5 | 88 km | 9.7 mi | 6 |
| Jun 17, 2010 | EF4 | 62 km | 16.9 mi | 1 |
| Jul 12, 1971 | EF4 | 41 km | 10.9 mi | 0 |
| Apr 30, 1967 | EF4 | 22 km | 13.3 mi | 0 |
| Apr 30, 1967 | EF4 | 22 km | 7.6 mi | 0 |
| Apr 30, 1967 | EF4 | 67 km | 20.1 mi | 6 |
| Apr 30, 1967 | EF4 | 46 km | 38.7 mi | 5 |
| May 5, 1965 | EF4 | 14 km | 41.6 mi | 0 |
| Sep 16, 1962 | EF4 | 76 km | 0.5 mi | 0 |
| Sep 1, 1961 | EF4 | 67 km | 26.6 mi | 0 |
| May 10, 1953 | EF4 | 60 km | 26.6 mi | 0 |
| May 10, 1953 | EF4 | 43 km | 162.0 mi | 2 |
| Jun 12, 2013 | EF3 | 83 km | 6.2 mi | 0 |
| Jun 17, 2010 | EF3 | 49 km | 5.0 mi | 0 |
| Jun 17, 2010 | EF3 | 54 km | 18.2 mi | 0 |
| Jun 17, 2010 | EF3 | 56 km | 4.3 mi | 0 |
| Jun 11, 2004 | EF3 | 30 km | 12.0 mi | 0 |
| Jul 19, 1994 | EF3 | 55 km | 23.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: SNAKE TRAIL (1,496 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | SNAKE TRAIL | 1,496 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-10°C) | 0.9 in | Coldest |
| February | 20°F (-7°C) | 0.8 in | Driest |
| March | 32°F (0°C) | 1.9 in | |
| April | 46°F (8°C) | 3.1 in | |
| May | 59°F (15°C) | 3.8 in | |
| June | 68°F (20°C) | 4.3 in | |
| July | 72°F (22°C) | 4.3 in | Warmest, Wettest |
| August | 69°F (21°C) | 4.3 in | |
| September | 61°F (16°C) | 3.9 in | |
| October | 49°F (9°C) | 2.4 in | |
| November | 33°F (0°C) | 1.7 in | |
| December | 19°F (-7°C) | 1.2 in |
St. Ansgar has a seasonal temperature swing of 57°F / from 15°F in January to 72°F in July. Total annual precipitation is 32.6 inches, with July being the wettest month (4.3") and February the driest (0.8").