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Weather & Climate in Janesville, MN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Janesville has a cool climate with an average annual temperature of 45°F (7°C). Winters average 13°F in January while summers reach 71°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 37.9 inches. The area receives 52.3 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 1,065 feet.
Temperature
13°F Jan (-10°C)
71°F Jul (22°C)
| Annual Average | 44.6°F |
| 17% below US avg | |
| January Average | 13°F (-10°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 1,065 ft (325 m) |
| Area | 1.5 sq mi (4.0 km²) |
| Population Density | 1,590/sq mi |
| Coordinates | 44.1198°N, 93.7097°W |
| Timezone | America/Chicago |
| County | Waseca County County |
| Nearest Airport | Mankato Regional (MKT) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 24.7 / 100 |
| Social Vulnerability | 31.5 / 100 |
| Community Resilience | 94.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| Feb 9, 1994 | 6 km NNE of Blomkest, Minnesota | M3.1 | 142 km | 5 km |
| Apr 25, 2017 | Near Mankato, Minnesota | M2.8 | 25 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
590 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 42 fatalities, 950 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 17, 2010 | EF4 | 61 km | 16.9 mi | 1 |
| Apr 30, 1967 | EF4 | 86 km | 7.6 mi | 0 |
| Apr 30, 1967 | EF4 | 39 km | 20.1 mi | 6 |
| Apr 30, 1967 | EF4 | 65 km | 38.7 mi | 5 |
| May 6, 1965 | EF4 | 74 km | 12.3 mi | 3 |
| May 6, 1965 | EF4 | 99 km | 17.3 mi | 6 |
| May 6, 1965 | EF4 | 82 km | 6.9 mi | 0 |
| Jun 19, 1951 | EF4 | 99 km | 52.6 mi | 1 |
| Jun 17, 2010 | EF3 | 55 km | 4.3 mi | 0 |
| Jun 17, 2010 | EF3 | 52 km | 18.2 mi | 0 |
| Jun 17, 2010 | EF3 | 55 km | 5.0 mi | 0 |
| Aug 24, 2006 | EF3 | 48 km | 33.0 mi | 1 |
| Aug 1, 2006 | EF3 | 84 km | 1.5 mi | 0 |
| Mar 29, 1998 | EF3 | 30 km | 6.0 mi | 0 |
| Mar 29, 1998 | EF3 | 41 km | 12.0 mi | 1 |
| Jul 27, 1987 | EF3 | 93 km | 30.0 mi | 0 |
| Jun 7, 1984 | EF3 | 58 km | 14.0 mi | 0 |
| May 17, 1982 | EF3 | 69 km | 46.0 mi | 0 |
| Jun 14, 1981 | EF3 | 85 km | 16.2 mi | 1 |
| May 28, 1974 | EF3 | 96 km | 3.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
6 wildfires (100+ acres) recorded within 100 km. Largest: SNAKE TRAIL (1,496 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | SNAKE TRAIL | 1,496 | 22 km |
| 2004 | EAGAN | 925 | 90 km |
| 1990 | UNNAMED | 598 | 45 km |
| 2024 | LINCOLN WPA RX | 575 | 46 km |
| 1995 | LV 68 CARVER | 532 | 68 km |
| 1990 | UNNAMED | 513 | 83 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 13°F (-10°C) | 0.8 in | Coldest |
| February | 19°F (-7°C) | 0.6 in | Driest |
| March | 31°F (-0°C) | 1.7 in | |
| April | 46°F (8°C) | 2.6 in | |
| May | 59°F (15°C) | 3.5 in | |
| June | 69°F (20°C) | 4.3 in | Wettest |
| July | 71°F (22°C) | 4.2 in | Warmest |
| August | 69°F (21°C) | 4.0 in | |
| September | 61°F (16°C) | 3.1 in | |
| October | 49°F (9°C) | 2.2 in | |
| November | 32°F (0°C) | 1.6 in | |
| December | 18°F (-8°C) | 0.9 in |
Janesville has a seasonal temperature swing of 58°F / from 13°F in January to 71°F in July. Total annual precipitation is 29.6 inches, with June being the wettest month (4.3") and February the driest (0.6").