Weather & Climate in Nashua, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Nashua experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 17°F in January while summers reach 72°F in July. Annual precipitation totals 38.1 inches. The area receives 35.7 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 40. 89% of days have good air quality. The city sits at an elevation of 1,007 feet.
Temperature
17°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 46.5°F |
| 14% below US avg | |
| January Average | 17°F (-9°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 1,007 ft (307 m) |
| Area | 3.1 sq mi (8.1 km²) |
| Population Density | 560/sq mi |
| Coordinates | 42.9504°N, 92.5425°W |
| Timezone | America/Chicago |
| County | Bremer County County |
| Nearest Airport | Northeast Iowa Regional (CCY) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
| Good Days % | 88.5% |
| Unhealthy Days | 0 |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 24.6 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 98.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| 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)
Tornado History
575 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 46 fatalities, 1,117 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 25, 2008 | EF5 | 52 km | 41.0 mi | 9 |
| May 15, 1968 | EF5 | 59 km | 13.1 mi | 5 |
| May 15, 1968 | EF5 | 51 km | 62.1 mi | 13 |
| Oct 14, 1966 | EF5 | 92 km | 9.7 mi | 6 |
| May 30, 1989 | EF4 | 91 km | 11.0 mi | 0 |
| Jul 12, 1971 | EF4 | 32 km | 10.9 mi | 0 |
| Apr 30, 1967 | EF4 | 75 km | 7.6 mi | 0 |
| Apr 30, 1967 | EF4 | 64 km | 13.3 mi | 0 |
| Apr 30, 1967 | EF4 | 100 km | 38.7 mi | 5 |
| Aug 26, 1965 | EF4 | 78 km | 4.7 mi | 1 |
| May 5, 1965 | EF4 | 43 km | 41.6 mi | 0 |
| Sep 1, 1961 | EF4 | 42 km | 26.6 mi | 0 |
| May 10, 1953 | EF4 | 57 km | 162.0 mi | 2 |
| May 10, 1953 | EF4 | 81 km | 26.6 mi | 0 |
| Jun 12, 2013 | EF3 | 93 km | 6.2 mi | 0 |
| May 25, 2008 | EF3 | 58 km | 32.0 mi | 0 |
| Jun 11, 2004 | EF3 | 50 km | 12.0 mi | 0 |
| May 11, 2000 | EF3 | 49 km | 18.6 mi | 1 |
| Jul 27, 1995 | EF3 | 81 km | 20.0 mi | 0 |
| Jul 19, 1994 | EF3 | 46 km | 23.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-9°C) | 1.1 in | Coldest, Driest |
| February | 21°F (-6°C) | 1.2 in | |
| March | 34°F (1°C) | 2.1 in | |
| April | 47°F (9°C) | 3.8 in | |
| May | 59°F (15°C) | 5.1 in | |
| June | 69°F (20°C) | 5.9 in | Wettest |
| July | 72°F (22°C) | 4.7 in | Warmest |
| August | 70°F (21°C) | 4.4 in | |
| September | 62°F (17°C) | 3.6 in | |
| October | 50°F (10°C) | 2.8 in | |
| November | 35°F (2°C) | 1.8 in | |
| December | 23°F (-5°C) | 1.5 in |
Nashua has a seasonal temperature swing of 55°F / from 17°F in January to 72°F in July. Total annual precipitation is 38.1 inches, with June being the wettest month (5.9") and January the driest (1.1").