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Weather & Climate in St. Peter, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Peter has a cool climate with an average annual temperature of 45°F (7°C). Winters average 17°F in January while summers reach 70°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 31.5 inches. The area receives 38.0 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 1,086 feet.
Temperature
17°F Jan (-8°C)
70°F Jul (21°C)
| Annual Average | 45.0°F |
| 17% below US avg | |
| January Average | 17°F (-8°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,086 ft (331 m) |
| Area | 3.6 sq mi (9.4 km²) |
| Population Density | 387/sq mi |
| Coordinates | 43.8383°N, 88.3433°W |
| Timezone | America/Chicago |
| County | Fond du Lac County County |
| Nearest Airport | Wittman Regional (OSH) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 76.3 / 100 |
| Social Vulnerability | 16.6 / 100 |
| Community Resilience | 94.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| 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 Low |
| Drought | Very 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.
| Aug 2, 2024 | 38 km ESE of Sturgeon Bay, Wisconsin | M2.9 | 146 km | 11 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
448 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 28 fatalities, 550 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 18, 1996 | EF5 | 27 km | 13.3 mi | 0 |
| Jul 5, 1994 | EF4 | 65 km | 3.5 mi | 0 |
| Apr 27, 1984 | EF4 | 42 km | 27.5 mi | 1 |
| Apr 27, 1984 | EF4 | 96 km | 6.5 mi | 1 |
| Apr 4, 1981 | EF4 | 47 km | 1.8 mi | 3 |
| Apr 21, 1974 | EF4 | 40 km | 26.0 mi | 0 |
| Aug 22, 1964 | EF4 | 61 km | 2.2 mi | 0 |
| Apr 3, 1956 | EF4 | 51 km | 11.5 mi | 7 |
| Sep 26, 1951 | EF4 | 94 km | 26.4 mi | 6 |
| Sep 26, 1951 | EF4 | 84 km | 9.0 mi | 1 |
| Jun 23, 2004 | EF3 | 52 km | 7.6 mi | 1 |
| Jun 23, 2004 | EF3 | 57 km | 33.3 mi | 0 |
| Aug 29, 1992 | EF3 | 98 km | 28.0 mi | 1 |
| Jun 8, 1984 | EF3 | 83 km | 29.0 mi | 0 |
| Apr 27, 1984 | EF3 | 90 km | 32.0 mi | 0 |
| Jun 5, 1980 | EF3 | 86 km | 10.7 mi | 0 |
| Apr 7, 1980 | EF3 | 64 km | 1.2 mi | 0 |
| Jun 5, 1977 | EF3 | 31 km | 69.5 mi | 0 |
| Jun 4, 1975 | EF3 | 98 km | 2.3 mi | 0 |
| Apr 21, 1974 | EF3 | 50 km | 58.6 mi | 2 |
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 | 41 km |
| 2010 | RX BURN | 1,236 | 41 km |
| 1994 | SOMMERS | 938 | 41 km |
| 1988 | PEACHY RD | 812 | 43 km |
| 2006 | UNNAMED | 612 | 40 km |
| 2007 | TOWER RD 2 | 592 | 43 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 | 31°F (-1°C) | 1.9 in | |
| April | 44°F (7°C) | 2.7 in | |
| May | 56°F (14°C) | 3.0 in | |
| June | 66°F (19°C) | 3.4 in | |
| July | 70°F (21°C) | 3.4 in | Warmest |
| August | 69°F (21°C) | 3.9 in | Wettest |
| September | 61°F (16°C) | 3.6 in | |
| October | 50°F (10°C) | 2.4 in | |
| November | 36°F (2°C) | 2.2 in | |
| December | 23°F (-5°C) | 1.5 in |
St. Peter has a seasonal temperature swing of 53°F / from 17°F in January to 70°F in July. Total annual precipitation is 30.0 inches, with August being the wettest month (3.9") and February the driest (1.0").