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Weather & Climate in Omro, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Omro 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 270 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 33.3 inches. The area receives 39.2 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 761 feet.
Temperature
18°F Jan (-8°C)
72°F Jul (22°C)
| Annual Average | 46.6°F |
| 14% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 761 ft (232 m) |
| Area | 2.5 sq mi (6.5 km²) |
| Population Density | 1,485/sq mi |
| Coordinates | 44.0390°N, 88.7370°W |
| Timezone | America/Chicago |
| County | Winnebago County County |
| Nearest Airport | Wittman Regional (OSH) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 86.8 / 100 |
| Social Vulnerability | 20.8 / 100 |
| Community Resilience | 97.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
479 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 28 fatalities, 394 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 18, 1996 | EF5 | 39 km | 13.3 mi | 0 |
| Jul 5, 1994 | EF4 | 78 km | 3.5 mi | 0 |
| Apr 27, 1984 | EF4 | 5 km | 27.5 mi | 1 |
| Apr 4, 1981 | EF4 | 80 km | 1.8 mi | 3 |
| Apr 21, 1974 | EF4 | 33 km | 26.0 mi | 0 |
| Aug 22, 1964 | EF4 | 98 km | 2.2 mi | 0 |
| Apr 3, 1956 | EF4 | 22 km | 11.5 mi | 7 |
| Sep 26, 1951 | EF4 | 76 km | 9.0 mi | 1 |
| Sep 26, 1951 | EF4 | 55 km | 26.4 mi | 6 |
| Jun 23, 2004 | EF3 | 44 km | 7.6 mi | 1 |
| Jun 23, 2004 | EF3 | 43 km | 33.3 mi | 0 |
| Aug 27, 1994 | EF3 | 95 km | 10.5 mi | 2 |
| Aug 29, 1992 | EF3 | 63 km | 28.0 mi | 1 |
| Jun 8, 1984 | EF3 | 77 km | 29.0 mi | 0 |
| Apr 27, 1984 | EF3 | 57 km | 32.0 mi | 0 |
| Apr 7, 1980 | EF3 | 65 km | 1.2 mi | 0 |
| Jun 5, 1977 | EF3 | 24 km | 69.5 mi | 0 |
| Jun 4, 1975 | EF3 | 98 km | 2.3 mi | 0 |
| Apr 21, 1974 | EF3 | 54 km | 22.2 mi | 0 |
| Apr 21, 1974 | EF3 | 60 km | 58.6 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
7 wildfires (100+ acres) recorded within 100 km. Largest: COTTONVILLE INCIDENT (3,466 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | COTTONVILLE INCIDENT | 3,466 | 81 km |
| 2006 | UNNAMED | 1,524 | 58 km |
| 2010 | RX BURN | 1,236 | 58 km |
| 1994 | SOMMERS | 938 | 53 km |
| 1988 | PEACHY RD | 812 | 56 km |
| 2006 | UNNAMED | 612 | 51 km |
| 2007 | TOWER RD 2 | 592 | 56 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 1.3 in | Coldest |
| February | 21°F (-6°C) | 1.0 in | Driest |
| March | 31°F (-0°C) | 2.0 in | |
| April | 45°F (7°C) | 2.8 in | |
| May | 57°F (14°C) | 3.3 in | |
| June | 67°F (19°C) | 3.5 in | |
| July | 72°F (22°C) | 3.6 in | Warmest |
| August | 69°F (20°C) | 3.9 in | Wettest |
| September | 60°F (16°C) | 3.6 in | |
| October | 49°F (9°C) | 2.3 in | |
| November | 35°F (2°C) | 2.2 in | |
| December | 22°F (-6°C) | 1.5 in |
Omro has a seasonal temperature swing of 54°F / from 18°F in January to 72°F in July. Total annual precipitation is 30.9 inches, with August being the wettest month (3.9") and February the driest (1.0").