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Weather & Climate in Osseo, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Osseo has a cool climate with an average annual temperature of 43°F (6°C). Winters average 13°F in January while summers reach 70°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 34.5 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 986 feet.
Temperature
13°F Jan (-11°C)
70°F Jul (21°C)
| Annual Average | 43.4°F |
| 20% below US avg | |
| January Average | 13°F (-11°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 986 ft (301 m) |
| Area | 2.1 sq mi (5.4 km²) |
| Population Density | 843/sq mi |
| Coordinates | 44.5798°N, 91.2138°W |
| Timezone | America/Chicago |
| County | Eau Claire County County |
| Nearest Airport | Chippewa Valley Regional (EAU) 24 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.3 / 100 |
| Social Vulnerability | 17.0 / 100 |
| Community Resilience | 85.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | No Rating |
| 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 Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
298 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 36 fatalities, 354 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 4, 1958 | EF5 | 95 km | 33.7 mi | 21 |
| Aug 31, 1977 | EF4 | 91 km | 31.8 mi | 0 |
| Jul 30, 1977 | EF4 | 63 km | 19.0 mi | 0 |
| Jun 4, 1958 | EF4 | 22 km | 59.2 mi | 4 |
| Jun 4, 1958 | EF4 | 44 km | 11.1 mi | 3 |
| Sep 24, 2019 | EF3 | 49 km | 7.0 mi | 0 |
| Sep 2, 2002 | EF3 | 99 km | 16.0 mi | 0 |
| May 15, 1998 | EF3 | 49 km | 8.0 mi | 0 |
| Aug 27, 1994 | EF3 | 18 km | 10.0 mi | 2 |
| Jul 3, 1983 | EF3 | 96 km | 1.0 mi | 0 |
| Jul 15, 1980 | EF3 | 37 km | 1.0 mi | 1 |
| Sep 28, 1971 | EF3 | 41 km | 49.6 mi | 0 |
| May 26, 1959 | EF3 | 67 km | 34.3 mi | 0 |
| Jun 4, 1958 | EF3 | 41 km | 4.3 mi | 0 |
| Sep 12, 1951 | EF3 | 69 km | 24.4 mi | 0 |
| Jun 15, 2022 | EF2 | 95 km | 22.9 mi | 0 |
| Dec 15, 2021 | EF2 | 34 km | 3.1 mi | 0 |
| Dec 15, 2021 | EF2 | 38 km | 2.8 mi | 0 |
| Dec 15, 2021 | EF2 | 40 km | 7.4 mi | 0 |
| Dec 15, 2021 | EF2 | 50 km | 1.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BIG BURN (3,154 acres, 1987).
| Year | Name | Acres Burned | Distance |
| 1987 | BIG BURN | 3,154 | 94 km |
| 2024 | 2024 DOD HARDWOOD RANGE RX | 2,717 | 98 km |
| 1994 | BIG BURN | 2,248 | 95 km |
| 2023 | 2023 RX | 1,992 | 98 km |
| 1997 | BIG BURN | 1,642 | 94 km |
| 1998 | UNNAMED | 1,297 | 95 km |
| 2021 | 2021 DOD HARDWOOD RANGE RX | 987 | 97 km |
| 2007 | BEAVER CUTOFF | 982 | 77 km |
| 2007 | UNNAMED | 981 | 99 km |
| 2003 | UNNAMED | 901 | 93 km |
| 2009 | UNNAMED | 867 | 99 km |
| 2007 | PR 16 | 778 | 94 km |
| 2006 | PR 17 RX FIRE | 701 | 96 km |
| 2005 | UNNAMED | 657 | 98 km |
| 2003 | PR 17 | 632 | 95 km |
| 2009 | UNNAMED | 589 | 95 km |
| 2004 | UNNAMED | 580 | 91 km |
| 2003 | UNNAMED | 580 | 99 km |
| 2003 | OS 23 | 571 | 99 km |
| 2001 | BIG BURN | 565 | 95 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-11°C) | 1.0 in | Coldest |
| February | 18°F (-8°C) | 0.8 in | Driest |
| March | 30°F (-1°C) | 2.0 in | |
| April | 44°F (7°C) | 3.0 in | |
| May | 57°F (14°C) | 3.8 in | |
| June | 66°F (19°C) | 4.1 in | |
| July | 70°F (21°C) | 4.2 in | Warmest |
| August | 68°F (20°C) | 4.3 in | Wettest |
| September | 59°F (15°C) | 4.1 in | |
| October | 48°F (9°C) | 2.6 in | |
| November | 33°F (0°C) | 1.8 in | |
| December | 18°F (-8°C) | 1.3 in |
Osseo has a seasonal temperature swing of 57°F / from 13°F in January to 70°F in July. Total annual precipitation is 32.8 inches, with August being the wettest month (4.3") and February the driest (0.8").