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Weather & Climate in Garnavillo, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Garnavillo experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 19°F in January while summers reach 74°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 37.3 inches. The area receives 34.4 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 1,042 feet.
Temperature
19°F Jan (-7°C)
74°F Jul (23°C)
| Annual Average | 48.5°F |
| 10% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,042 ft (318 m) |
| Area | 1.0 sq mi (2.6 km²) |
| Population Density | 867/sq mi |
| Coordinates | 42.8667°N, 91.2362°W |
| Timezone | America/Chicago |
| County | Clayton County County |
| Nearest Airport | Dubuque Regional (DBQ) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 42.2 / 100 |
| Social Vulnerability | 27.6 / 100 |
| Community Resilience | 63.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
466 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 8 fatalities, 316 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 15, 1968 | EF5 | 61 km | 13.1 mi | 5 |
| Mar 13, 1990 | EF4 | 72 km | 19.0 mi | 0 |
| Jul 3, 1983 | EF4 | 91 km | 0.5 mi | 0 |
| Aug 12, 1974 | EF4 | 61 km | 5.0 mi | 0 |
| Apr 30, 1954 | EF4 | 95 km | 80.4 mi | 0 |
| Aug 7, 2021 | EF3 | 51 km | 9.4 mi | 0 |
| May 25, 2008 | EF3 | 71 km | 32.0 mi | 0 |
| Jul 27, 1995 | EF3 | 47 km | 20.0 mi | 0 |
| Jul 19, 1994 | EF3 | 95 km | 23.0 mi | 0 |
| Jun 19, 1993 | EF3 | 55 km | 9.0 mi | 0 |
| Jun 19, 1993 | EF3 | 74 km | 14.0 mi | 0 |
| Jul 13, 1992 | EF3 | 77 km | 5.0 mi | 0 |
| May 8, 1988 | EF3 | 88 km | 16.0 mi | 0 |
| May 30, 1985 | EF3 | 24 km | 34.0 mi | 2 |
| Jun 5, 1980 | EF3 | 89 km | 26.9 mi | 0 |
| Jul 12, 1971 | EF3 | 67 km | 0.1 mi | 0 |
| Jun 24, 1971 | EF3 | 53 km | 0.1 mi | 1 |
| Sep 9, 1970 | EF3 | 62 km | 4.7 mi | 0 |
| May 5, 1965 | EF3 | 95 km | 65.2 mi | 0 |
| Sep 3, 1964 | EF3 | 62 km | 17.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 0.9 in | Coldest, Driest |
| February | 22°F (-6°C) | 1.1 in | |
| March | 34°F (1°C) | 2.1 in | |
| April | 47°F (9°C) | 3.4 in | |
| May | 59°F (15°C) | 3.9 in | |
| June | 68°F (20°C) | 4.2 in | |
| July | 74°F (23°C) | 4.0 in | Warmest |
| August | 70°F (21°C) | 4.3 in | Wettest |
| September | 62°F (16°C) | 3.5 in | |
| October | 50°F (10°C) | 2.4 in | |
| November | 35°F (2°C) | 2.2 in | |
| December | 22°F (-6°C) | 1.4 in |
Garnavillo has a seasonal temperature swing of 55°F / from 19°F in January to 74°F in July. Total annual precipitation is 33.4 inches, with August being the wettest month (4.3") and January the driest (0.9").