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Weather & Climate in Hermantown, MN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hermantown has a cool climate with an average annual temperature of 40°F (4°C). Winters average 9°F in January while summers reach 66°F in July. The area gets 249 sunny days per year, above the national average. Annual precipitation totals 30.9 inches. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 1,329 feet.
Temperature
9°F Jan (-13°C)
66°F Jul (19°C)
| Annual Average | 39.7°F |
| 26% below US avg | |
| January Average | 9°F (-13°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 249 days/yr |
Geography
| Elevation | 1,329 ft (405 m) |
| Area | 34.4 sq mi (89.0 km²) |
| Population Density | 297/sq mi |
| Coordinates | 46.8023°N, 92.2408°W |
| Timezone | America/Chicago |
| County | Carlton County County |
| Nearest Airport | Duluth International (DLH) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 70.1 / 100 |
| Social Vulnerability | 27.5 / 100 |
| Community Resilience | 90.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| 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)
Tornado History
63 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 3 fatalities, 42 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 6, 1969 | EF3 | 28 km | 17.2 mi | 2 |
| Aug 6, 1969 | EF3 | 59 km | 18.4 mi | 0 |
| Aug 6, 1969 | EF3 | 93 km | 12.5 mi | 1 |
| Aug 6, 1969 | EF3 | 99 km | 10.0 mi | 0 |
| Jun 30, 1968 | EF3 | 92 km | 0.1 mi | 0 |
| Jul 1, 2011 | EF2 | 61 km | 2.9 mi | 0 |
| Sep 3, 1980 | EF2 | 37 km | 9.9 mi | 0 |
| Sep 8, 1977 | EF2 | 100 km | 3.6 mi | 0 |
| Jun 7, 1977 | EF2 | 95 km | 0.5 mi | 0 |
| Jul 7, 1970 | EF2 | 61 km | 22.3 mi | 0 |
| Jun 30, 1968 | EF2 | 71 km | 39.0 mi | 0 |
| Sep 19, 2024 | EF1 | 37 km | 5.9 mi | 0 |
| Jul 11, 2022 | EF1 | 51 km | 4.6 mi | 0 |
| Aug 14, 2020 | EF1 | 78 km | 1.5 mi | 0 |
| Aug 14, 2020 | EF1 | 63 km | 2.7 mi | 0 |
| Jul 18, 2020 | EF1 | 49 km | 0.4 mi | 0 |
| Jul 18, 2019 | EF1 | 73 km | 1.3 mi | 0 |
| Jun 19, 2016 | EF1 | 64 km | 7.2 mi | 0 |
| Jun 19, 2016 | EF1 | 80 km | 8.1 mi | 0 |
| Jun 27, 1994 | EF1 | 67 km | 4.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: GERMANN ROAD FIRE (6,751 acres, 2013).
| Year | Name | Acres Burned | Distance |
| 2013 | GERMANN ROAD FIRE | 6,751 | 71 km |
| 2019 | NW SANDS UNITS I/F/C/A | 3,386 | 76 km |
| 2003 | UNNAMED | 2,998 | 86 km |
| 2015 | TAMARACK | 2,745 | 77 km |
| 2016 | UNNAMED | 2,682 | 75 km |
| 1987 | UNNAMED | 2,512 | 85 km |
| 1991 | UNNAMED | 2,486 | 94 km |
| 2013 | UNNAMED | 2,240 | 76 km |
| 2014 | UNNAMED | 2,116 | 80 km |
| 1987 | UNNAMED | 1,963 | 100 km |
| 1987 | UNNAMED | 1,799 | 95 km |
| 1987 | UNNAMED | 1,760 | 94 km |
| 2015 | UNNAMED | 1,407 | 78 km |
| 2004 | SOUTH MAIN ROAD | 1,384 | 90 km |
| 2006 | WUI RX BURN UNIT 15 | 1,380 | 89 km |
| 2015 | UNNAMED | 1,361 | 75 km |
| 2021 | NW SANDS - BLOCK E RX | 1,361 | 79 km |
| 1987 | UNNAMED | 1,352 | 70 km |
| 1997 | UNNAMED | 1,306 | 94 km |
| 2009 | UNNAMED | 1,249 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 9°F (-13°C) | 1.1 in | Coldest |
| February | 14°F (-10°C) | 0.8 in | Driest |
| March | 25°F (-4°C) | 1.6 in | |
| April | 39°F (4°C) | 2.2 in | |
| May | 52°F (11°C) | 3.1 in | |
| June | 61°F (16°C) | 4.1 in | |
| July | 66°F (19°C) | 4.0 in | Warmest |
| August | 65°F (18°C) | 4.2 in | Wettest |
| September | 56°F (13°C) | 3.9 in | |
| October | 44°F (7°C) | 2.6 in | |
| November | 29°F (-2°C) | 2.1 in | |
| December | 14°F (-10°C) | 1.0 in |
Hermantown has a seasonal temperature swing of 57°F / from 9°F in January to 66°F in July. Total annual precipitation is 30.5 inches, with August being the wettest month (4.2") and February the driest (0.8").