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Weather & Climate in Kewaskum, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Kewaskum experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 19°F in January while summers reach 73°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 32.4 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 936 feet.
Temperature
19°F Jan (-7°C)
73°F Jul (23°C)
| Annual Average | 47.0°F |
| 13% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 936 ft (285 m) |
| Area | 2.4 sq mi (6.1 km²) |
| Population Density | 1,761/sq mi |
| Coordinates | 43.5176°N, 88.2306°W |
| Timezone | America/Chicago |
| County | Washington County County |
| Nearest Airport | Wittman Regional (OSH) 38 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 68.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 96.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| 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 | Relatively Low |
| Cold Wave | Relatively High |
| 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.
| Mar 25, 2015 | 3 km WNW of Lake in the Hills, Illinois | M2.9 | 148 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
441 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 21 fatalities, 554 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 18, 1996 | EF5 | 37 km | 13.3 mi | 0 |
| Jul 5, 1994 | EF4 | 91 km | 3.5 mi | 0 |
| Apr 27, 1984 | EF4 | 75 km | 27.5 mi | 1 |
| Apr 27, 1984 | EF4 | 61 km | 6.5 mi | 1 |
| Apr 4, 1981 | EF4 | 10 km | 1.8 mi | 3 |
| Apr 21, 1974 | EF4 | 55 km | 26.0 mi | 0 |
| Aug 22, 1964 | EF4 | 29 km | 2.2 mi | 0 |
| Apr 3, 1956 | EF4 | 75 km | 11.5 mi | 7 |
| Sep 26, 1951 | EF4 | 82 km | 9.0 mi | 1 |
| Jun 23, 2004 | EF3 | 68 km | 33.3 mi | 0 |
| Jun 23, 2004 | EF3 | 60 km | 7.6 mi | 1 |
| Jun 8, 1984 | EF3 | 81 km | 29.0 mi | 0 |
| Jun 5, 1980 | EF3 | 61 km | 10.7 mi | 0 |
| Apr 7, 1980 | EF3 | 60 km | 1.2 mi | 0 |
| Jun 5, 1977 | EF3 | 52 km | 69.5 mi | 0 |
| Jun 4, 1975 | EF3 | 87 km | 2.3 mi | 0 |
| Apr 21, 1974 | EF3 | 42 km | 58.6 mi | 2 |
| Apr 21, 1974 | EF3 | 42 km | 22.2 mi | 0 |
| Dec 1, 1970 | EF3 | 96 km | 13.1 mi | 0 |
| Jun 25, 1950 | EF3 | 75 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
7 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,524 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | UNNAMED | 1,524 | 31 km |
| 2010 | RX BURN | 1,236 | 31 km |
| 1994 | SOMMERS | 938 | 36 km |
| 1988 | PEACHY RD | 812 | 36 km |
| 2006 | UNNAMED | 612 | 38 km |
| 2007 | TOWER RD 2 | 592 | 36 km |
| 2024 | RX-HWY Y - SOUTH | 553 | 74 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 1.1 in | Coldest |
| February | 21°F (-6°C) | 1.0 in | Driest |
| March | 32°F (-0°C) | 2.0 in | |
| April | 44°F (7°C) | 2.9 in | |
| May | 56°F (13°C) | 3.0 in | |
| June | 65°F (18°C) | 3.5 in | |
| July | 73°F (23°C) | 3.7 in | Warmest |
| August | 68°F (20°C) | 3.9 in | |
| September | 60°F (16°C) | 4.2 in | Wettest |
| October | 49°F (9°C) | 2.7 in | |
| November | 35°F (2°C) | 2.3 in | |
| December | 23°F (-5°C) | 1.7 in |
Kewaskum has a seasonal temperature swing of 54°F / from 19°F in January to 73°F in July. Total annual precipitation is 32.0 inches, with September being the wettest month (4.2") and February the driest (1.0").