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Weather & Climate in Grantsburg, WI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grantsburg has a cool climate with an average annual temperature of 43°F (6°C). Winters average 12°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 33.8 inches. The area receives 52.2 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 924 feet.
Temperature
12°F Jan (-11°C)
70°F Jul (21°C)
| Annual Average | 43.1°F |
| 20% below US avg | |
| January Average | 12°F (-11°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 924 ft (282 m) |
| Area | 3.0 sq mi (7.8 km²) |
| Population Density | 447/sq mi |
| Coordinates | 45.7838°N, 92.6773°W |
| Timezone | America/Chicago |
| County | Burnett County County |
| Nearest Airport | New Richmond Regional (RNH) 44 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 49.3 / 100 |
| Social Vulnerability | 76.7 / 100 |
| Community Resilience | 28.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
262 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 15 fatalities, 365 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 3, 1983 | EF4 | 80 km | 1.0 mi | 0 |
| May 6, 1965 | EF4 | 96 km | 6.8 mi | 3 |
| May 21, 1957 | EF4 | 27 km | 9.2 mi | 0 |
| May 16, 2017 | EF3 | 71 km | 82.5 mi | 1 |
| May 25, 2008 | EF3 | 73 km | 6.0 mi | 1 |
| Jun 18, 2001 | EF3 | 2 km | 34.0 mi | 2 |
| Jul 23, 1987 | EF3 | 94 km | 5.0 mi | 0 |
| Apr 26, 1984 | EF3 | 95 km | 5.5 mi | 1 |
| Jul 30, 1977 | EF3 | 77 km | 9.1 mi | 0 |
| Jun 30, 1968 | EF3 | 55 km | 0.1 mi | 0 |
| May 24, 1958 | EF3 | 74 km | 59.4 mi | 0 |
| Jun 23, 1952 | EF3 | 41 km | 18.2 mi | 2 |
| Jul 1, 2011 | EF2 | 86 km | 2.9 mi | 0 |
| Jun 17, 2010 | EF2 | 17 km | 7.8 mi | 0 |
| Sep 16, 2006 | EF2 | 99 km | 8.0 mi | 1 |
| Sep 21, 2005 | EF2 | 85 km | 2.0 mi | 0 |
| Sep 18, 1997 | EF2 | 69 km | 17.0 mi | 0 |
| Jul 21, 1995 | EF2 | 76 km | 10.0 mi | 0 |
| Apr 26, 1994 | EF2 | 92 km | 4.0 mi | 0 |
| Apr 26, 1994 | EF2 | 81 km | 5.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNIT 4 (5,887 acres, 2002).
| Year | Name | Acres Burned | Distance |
| 2002 | UNIT 4 | 5,887 | 91 km |
| 2003 | UNITS 37 38 39 A | 4,879 | 86 km |
| 1998 | UNITS 1617 | 4,649 | 85 km |
| 2005 | RX HFR 05 | 4,253 | 86 km |
| 2009 | BU9 | 4,112 | 91 km |
| 2007 | WUI 07 - UNIT 36 | 4,025 | 86 km |
| 2000 | UNIT 25 | 3,412 | 86 km |
| 2009 | BU11 | 3,242 | 90 km |
| 1997 | BIG | 2,987 | 87 km |
| 2009 | UNNAMED | 2,904 | 67 km |
| 2003 | UNITS 34 33 W | 2,637 | 87 km |
| 2024 | UNIT 8E RX | 2,551 | 89 km |
| 1992 | SHARPTAIL | 2,288 | 88 km |
| 1988 | UNNAMED | 2,243 | 88 km |
| 2024 | RX-86_FY23 | 2,187 | 13 km |
| 2010 | WUI 10 UNIT D | 2,042 | 88 km |
| 1996 | UNNAMED | 1,906 | 85 km |
| 2000 | UNNAMED | 1,850 | 13 km |
| 2006 | UNIT 4 | 1,732 | 90 km |
| 2009 | UNIT 23 24 26 | 1,644 | 87 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 12°F (-11°C) | 1.0 in | Coldest |
| February | 17°F (-9°C) | 0.8 in | Driest |
| March | 29°F (-2°C) | 1.7 in | |
| April | 44°F (7°C) | 2.3 in | |
| May | 57°F (14°C) | 3.5 in | |
| June | 65°F (18°C) | 4.4 in | Wettest |
| July | 70°F (21°C) | 3.9 in | Warmest |
| August | 67°F (20°C) | 4.2 in | |
| September | 58°F (14°C) | 3.6 in | |
| October | 46°F (8°C) | 2.5 in | |
| November | 30°F (-1°C) | 1.7 in | |
| December | 16°F (-9°C) | 1.2 in |
Grantsburg has a seasonal temperature swing of 59°F / from 12°F in January to 70°F in July. Total annual precipitation is 30.7 inches, with June being the wettest month (4.4") and February the driest (0.8").