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Weather & Climate in Dedham, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Dedham 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. The area gets 275 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 35.0 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 1,270 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) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,270 ft (387 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 476/sq mi |
| Coordinates | 41.9084°N, 94.8233°W |
| Timezone | America/Chicago |
| County | Audubon County County |
| Nearest Airport | Fort Dodge Regional (FOD) 55 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 38.6 / 100 |
| Social Vulnerability | 48.2 / 100 |
| Community Resilience | 90.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively 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: M2.7.
| Jun 30, 2021 | 4 km E of Rembrandt, Iowa | M2.7 | 105 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
620 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 17 fatalities, 237 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 13, 1976 | EF5 | 79 km | 21.3 mi | 0 |
| Jun 27, 1953 | EF5 | 52 km | 0.1 mi | 1 |
| Mar 5, 2022 | EF4 | 91 km | 70.6 mi | 6 |
| Apr 9, 2011 | EF4 | 91 km | 3.2 mi | 0 |
| May 27, 1995 | EF4 | 19 km | 36.0 mi | 0 |
| May 27, 1995 | EF4 | 99 km | 57.0 mi | 0 |
| May 27, 1995 | EF4 | 20 km | 30.0 mi | 0 |
| May 24, 1989 | EF4 | 90 km | 66.0 mi | 0 |
| Jun 28, 1979 | EF4 | 82 km | 14.9 mi | 3 |
| May 4, 1977 | EF4 | 89 km | 2.0 mi | 0 |
| Jun 26, 1976 | EF4 | 82 km | 5.1 mi | 0 |
| Jun 8, 1967 | EF4 | 86 km | 2.0 mi | 0 |
| May 5, 1965 | EF4 | 52 km | 9.9 mi | 0 |
| May 10, 1959 | EF4 | 48 km | 41.1 mi | 0 |
| Jun 9, 1954 | EF4 | 42 km | 9.9 mi | 1 |
| Apr 26, 2024 | EF3 | 93 km | 40.3 mi | 1 |
| Jul 14, 2021 | EF3 | 39 km | 10.8 mi | 0 |
| Apr 9, 2011 | EF3 | 72 km | 29.4 mi | 0 |
| Apr 9, 2011 | EF3 | 63 km | 10.1 mi | 0 |
| Apr 9, 2011 | EF3 | 87 km | 3.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: UNNAMED (4,195 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | UNNAMED | 4,195 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 0.8 in | Coldest, Driest |
| February | 25°F (-4°C) | 0.9 in | |
| March | 36°F (2°C) | 2.2 in | |
| April | 49°F (10°C) | 3.4 in | |
| May | 61°F (16°C) | 4.3 in | |
| June | 70°F (21°C) | 4.7 in | Wettest |
| July | 72°F (22°C) | 4.0 in | Warmest |
| August | 72°F (22°C) | 3.9 in | |
| September | 64°F (18°C) | 3.7 in | |
| October | 52°F (11°C) | 2.6 in | |
| November | 36°F (2°C) | 1.6 in | |
| December | 23°F (-5°C) | 1.1 in |
Dedham has a seasonal temperature swing of 54°F / from 18°F in January to 72°F in July. Total annual precipitation is 33.0 inches, with June being the wettest month (4.7") and January the driest (0.8").