Weather & Climate in Anamosa, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Anamosa experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 18°F in January while summers reach 72°F in July. Annual precipitation totals 40.2 inches. The area receives 34.3 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 837 feet.
Temperature
18°F Jan (-8°C)
72°F Jul (22°C)
| Annual Average | 47.0°F |
| 13% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 837 ft (255 m) |
| Area | 2.5 sq mi (6.5 km²) |
| Population Density | 2,204/sq mi |
| Coordinates | 42.1088°N, 91.2752°W |
| Timezone | America/Chicago |
| County | Jones County County |
| Nearest Airport | Monticello Regional (MXO) 10 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 32.7 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 78.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
664 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 13 fatalities, 500 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 15, 1968 | EF5 | 82 km | 13.1 mi | 5 |
| Mar 13, 1990 | EF4 | 18 km | 19.0 mi | 0 |
| Aug 12, 1974 | EF4 | 85 km | 2.0 mi | 0 |
| Aug 12, 1974 | EF4 | 32 km | 5.0 mi | 0 |
| Aug 26, 1965 | EF4 | 79 km | 4.7 mi | 1 |
| Apr 11, 1965 | EF4 | 41 km | 91.5 mi | 1 |
| Apr 30, 1954 | EF4 | 39 km | 80.4 mi | 0 |
| May 25, 2008 | EF3 | 82 km | 32.0 mi | 0 |
| Jun 1, 2007 | EF3 | 94 km | 15.8 mi | 0 |
| May 21, 2004 | EF3 | 45 km | 3.0 mi | 0 |
| May 15, 1998 | EF3 | 100 km | 47.0 mi | 0 |
| Jul 27, 1995 | EF3 | 64 km | 20.0 mi | 0 |
| May 9, 1995 | EF3 | 68 km | 10.0 mi | 0 |
| Jun 19, 1993 | EF3 | 51 km | 14.0 mi | 0 |
| Jun 19, 1993 | EF3 | 41 km | 9.0 mi | 0 |
| Jul 13, 1992 | EF3 | 14 km | 5.0 mi | 0 |
| Mar 13, 1990 | EF3 | 100 km | 15.5 mi | 0 |
| May 8, 1988 | EF3 | 57 km | 32.0 mi | 0 |
| May 30, 1985 | EF3 | 85 km | 34.0 mi | 2 |
| Nov 9, 1975 | EF3 | 99 km | 39.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
4 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (939 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | UNNAMED | 939 | 86 km |
| 2010 | FOLEY | 786 | 83 km |
| 2011 | ACE AUTO | 676 | 75 km |
| 2011 | IRCP WUI ROFAE #2 FY11 | 510 | 91 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 1.5 in | Coldest, Driest |
| February | 22°F (-6°C) | 1.6 in | |
| March | 35°F (2°C) | 1.8 in | |
| April | 48°F (9°C) | 4.0 in | |
| May | 59°F (15°C) | 4.8 in | |
| June | 69°F (21°C) | 5.8 in | Wettest |
| July | 72°F (22°C) | 5.2 in | Warmest |
| August | 70°F (21°C) | 4.5 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 50°F (10°C) | 3.2 in | |
| November | 36°F (2°C) | 2.3 in | |
| December | 25°F (-4°C) | 1.8 in |
Anamosa has a seasonal temperature swing of 55°F / from 18°F in January to 72°F in July. Total annual precipitation is 40.2 inches, with June being the wettest month (5.8") and January the driest (1.5").