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Weather & Climate in Cornell, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Cornell has a cool climate with an average annual temperature of 43°F (6°C). Winters average 12°F in January while summers reach 69°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. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 1,031 feet.
Temperature
12°F Jan (-11°C)
69°F Jul (21°C)
| Annual Average | 42.7°F |
| 21% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 1,031 ft (314 m) |
| Area | 4.3 sq mi (11.2 km²) |
| Population Density | 351/sq mi |
| Coordinates | 45.1638°N, 91.1504°W |
| Timezone | America/Chicago |
| County | Chippewa County County |
| Nearest Airport | Chippewa Valley Regional (EAU) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 67.3 / 100 |
| Social Vulnerability | 18.7 / 100 |
| Community Resilience | 82.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
275 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 37 fatalities, 354 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 4, 1958 | EF5 | 97 km | 33.7 mi | 21 |
| Aug 31, 1977 | EF4 | 93 km | 31.8 mi | 0 |
| Jul 30, 1977 | EF4 | 31 km | 19.0 mi | 0 |
| Jun 4, 1958 | EF4 | 45 km | 59.2 mi | 4 |
| Jun 4, 1958 | EF4 | 36 km | 11.1 mi | 3 |
| Sep 24, 2019 | EF3 | 54 km | 7.0 mi | 0 |
| May 16, 2017 | EF3 | 80 km | 82.5 mi | 1 |
| Apr 10, 2011 | EF3 | 99 km | 21.2 mi | 0 |
| Sep 2, 2002 | EF3 | 34 km | 16.0 mi | 0 |
| May 15, 1998 | EF3 | 85 km | 8.0 mi | 0 |
| Aug 27, 1994 | EF3 | 61 km | 10.0 mi | 2 |
| Jul 15, 1980 | EF3 | 47 km | 1.0 mi | 1 |
| Jul 30, 1977 | EF3 | 84 km | 9.1 mi | 0 |
| Sep 28, 1971 | EF3 | 29 km | 49.6 mi | 0 |
| Jun 4, 1958 | EF3 | 24 km | 4.3 mi | 0 |
| Sep 12, 1951 | EF3 | 94 km | 24.4 mi | 0 |
| Dec 15, 2021 | EF2 | 78 km | 3.1 mi | 0 |
| Dec 15, 2021 | EF2 | 32 km | 7.4 mi | 0 |
| Dec 15, 2021 | EF2 | 77 km | 1.1 mi | 0 |
| Dec 15, 2021 | EF2 | 79 km | 2.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 12°F (-11°C) | 1.0 in | Coldest |
| February | 17°F (-9°C) | 0.8 in | Driest |
| March | 29°F (-2°C) | 1.7 in | |
| April | 43°F (6°C) | 2.7 in | |
| May | 56°F (13°C) | 3.7 in | |
| June | 64°F (18°C) | 4.3 in | |
| July | 69°F (21°C) | 3.9 in | Warmest |
| August | 67°F (19°C) | 4.5 in | Wettest |
| September | 58°F (14°C) | 4.2 in | |
| October | 46°F (8°C) | 2.5 in | |
| November | 31°F (-0°C) | 1.9 in | |
| December | 17°F (-8°C) | 1.2 in |
Cornell has a seasonal temperature swing of 57°F / from 12°F in January to 69°F in July. Total annual precipitation is 32.2 inches, with August being the wettest month (4.5") and February the driest (0.8").