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Weather & Climate in Brillion, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Brillion has a cool climate with an average annual temperature of 45°F (7°C). Winters average 18°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 32.2 inches. The area receives 43.2 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 816 feet.
Temperature
18°F Jan (-8°C)
70°F Jul (21°C)
| Annual Average | 45.2°F |
| 16% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 816 ft (249 m) |
| Area | 2.8 sq mi (7.1 km²) |
| Population Density | 1,070/sq mi |
| Coordinates | 44.1735°N, 88.0678°W |
| Timezone | America/Chicago |
| County | Calumet County County |
| Nearest Airport | Green Bay/Austin Straubel International (GRB) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 30.2 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 99.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Very 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: M2.9.
| Aug 2, 2024 | 38 km ESE of Sturgeon Bay, Wisconsin | M2.9 | 106 km | 11 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
328 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 22 fatalities, 275 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 18, 1996 | EF5 | 69 km | 13.3 mi | 0 |
| Jul 5, 1994 | EF4 | 23 km | 3.5 mi | 0 |
| Apr 27, 1984 | EF4 | 55 km | 27.5 mi | 1 |
| Apr 4, 1981 | EF4 | 83 km | 1.8 mi | 3 |
| Apr 21, 1974 | EF4 | 77 km | 26.0 mi | 0 |
| Aug 22, 1964 | EF4 | 89 km | 2.2 mi | 0 |
| Apr 3, 1956 | EF4 | 77 km | 11.5 mi | 7 |
| Sep 26, 1951 | EF4 | 100 km | 26.4 mi | 6 |
| Jun 23, 2004 | EF3 | 92 km | 33.3 mi | 0 |
| Jun 23, 2004 | EF3 | 90 km | 7.6 mi | 1 |
| Apr 27, 1984 | EF3 | 79 km | 32.0 mi | 0 |
| Jun 5, 1977 | EF3 | 66 km | 69.5 mi | 0 |
| Apr 21, 1974 | EF3 | 88 km | 22.2 mi | 0 |
| Apr 21, 1974 | EF3 | 93 km | 58.6 mi | 2 |
| Dec 1, 1970 | EF3 | 50 km | 13.1 mi | 0 |
| Jun 26, 1969 | EF3 | 45 km | 15.3 mi | 0 |
| Jun 25, 1950 | EF3 | 75 km | 0.1 mi | 0 |
| Aug 28, 2018 | EF2 | 72 km | 3.9 mi | 0 |
| Aug 6, 2013 | EF2 | 61 km | 13.1 mi | 0 |
| Apr 10, 2011 | EF2 | 20 km | 1.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
6 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,524 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | UNNAMED | 1,524 | 85 km |
| 2010 | RX BURN | 1,236 | 85 km |
| 1994 | SOMMERS | 938 | 83 km |
| 1988 | PEACHY RD | 812 | 86 km |
| 2006 | UNNAMED | 612 | 82 km |
| 2007 | TOWER RD 2 | 592 | 86 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 1.2 in | Coldest |
| February | 21°F (-6°C) | 0.9 in | Driest |
| March | 31°F (-1°C) | 1.9 in | |
| April | 44°F (6°C) | 2.6 in | |
| May | 55°F (13°C) | 3.0 in | |
| June | 65°F (18°C) | 3.6 in | Wettest |
| July | 70°F (21°C) | 3.3 in | Warmest |
| August | 68°F (20°C) | 3.5 in | |
| September | 60°F (15°C) | 3.4 in | |
| October | 48°F (9°C) | 2.4 in | |
| November | 35°F (2°C) | 2.1 in | |
| December | 22°F (-6°C) | 1.4 in |
Brillion has a seasonal temperature swing of 53°F / from 18°F in January to 70°F in July. Total annual precipitation is 29.3 inches, with June being the wettest month (3.6") and February the driest (0.9").