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Weather & Climate in Prairie du Sac, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Prairie du Sac experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 17°F in January while summers reach 71°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 36.5 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 792 feet.
Temperature
17°F Jan (-8°C)
71°F Jul (22°C)
| Annual Average | 45.9°F |
| 15% below US avg | |
| January Average | 17°F (-8°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 792 ft (241 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 2,204/sq mi |
| Coordinates | 43.2939°N, 89.7352°W |
| Timezone | America/Chicago |
| County | Sauk County County |
| Nearest Airport | Dane County Regional/Truax Field (MSN) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 72.1 / 100 |
| Social Vulnerability | 21.9 / 100 |
| Community Resilience | 82.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
524 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 34 fatalities, 709 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 7, 1984 | EF5 | 41 km | 36.0 mi | 9 |
| Jul 3, 1983 | EF4 | 48 km | 0.5 mi | 0 |
| Apr 21, 1974 | EF4 | 89 km | 26.0 mi | 0 |
| Apr 19, 1957 | EF4 | 73 km | 21.1 mi | 1 |
| Apr 3, 1956 | EF4 | 94 km | 11.5 mi | 7 |
| Sep 26, 1951 | EF4 | 44 km | 9.0 mi | 1 |
| Aug 7, 2021 | EF3 | 82 km | 9.4 mi | 0 |
| Jun 16, 2014 | EF3 | 36 km | 1.0 mi | 0 |
| Aug 18, 2005 | EF3 | 48 km | 18.6 mi | 1 |
| Jun 23, 2004 | EF3 | 76 km | 7.6 mi | 1 |
| Jun 23, 2004 | EF3 | 74 km | 33.3 mi | 0 |
| Aug 27, 1994 | EF3 | 91 km | 10.5 mi | 2 |
| Aug 29, 1992 | EF3 | 88 km | 28.0 mi | 1 |
| Jun 17, 1992 | EF3 | 49 km | 16.0 mi | 0 |
| May 8, 1988 | EF3 | 89 km | 16.0 mi | 0 |
| Jun 8, 1984 | EF3 | 44 km | 29.0 mi | 0 |
| Jul 3, 1983 | EF3 | 96 km | 1.0 mi | 0 |
| Jun 5, 1980 | EF3 | 80 km | 10.7 mi | 0 |
| Apr 7, 1980 | EF3 | 65 km | 1.2 mi | 0 |
| Jun 5, 1977 | EF3 | 100 km | 69.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: COTTONVILLE INCIDENT (3,466 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | COTTONVILLE INCIDENT | 3,466 | 90 km |
| 2004 | POOL ONE NORTH | 1,576 | 93 km |
| 2006 | UNNAMED | 1,524 | 94 km |
| 2010 | RX BURN | 1,236 | 94 km |
| 2007 | UNNAMED | 981 | 94 km |
| 1994 | SOMMERS | 938 | 91 km |
| 1998 | PR 17 | 896 | 93 km |
| 2007 | UNNAMED | 875 | 92 km |
| 2009 | UNNAMED | 867 | 94 km |
| 1988 | PEACHY RD | 812 | 90 km |
| 2018 | 2018 BADGER RX BURNS | 659 | 9 km |
| 2005 | UNNAMED | 657 | 96 km |
| 2019 | 2019 BADGER RX BURNS | 627 | 8 km |
| 2006 | UNNAMED | 612 | 91 km |
| 2007 | TOWER RD 2 | 592 | 90 km |
| 2009 | UNNAMED | 589 | 100 km |
| 2003 | UNNAMED | 580 | 94 km |
| 2003 | OS 23 | 571 | 96 km |
| 2008 | UNNAMED | 569 | 93 km |
| 1987 | UNNAMED | 560 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-8°C) | 1.1 in | Coldest |
| February | 21°F (-6°C) | 1.0 in | Driest |
| March | 33°F (0°C) | 2.1 in | |
| April | 45°F (7°C) | 2.8 in | |
| May | 58°F (14°C) | 3.2 in | |
| June | 67°F (19°C) | 3.8 in | |
| July | 71°F (22°C) | 3.8 in | Warmest |
| August | 69°F (20°C) | 4.0 in | Wettest |
| September | 61°F (16°C) | 3.8 in | |
| October | 49°F (10°C) | 2.3 in | |
| November | 35°F (2°C) | 2.0 in | |
| December | 22°F (-5°C) | 1.5 in |
Prairie du Sac has a seasonal temperature swing of 54°F / from 17°F in January to 71°F in July. Total annual precipitation is 31.5 inches, with August being the wettest month (4.0") and February the driest (1.0").