Duluth, MN
Climate overview — based on NOAA 1991-2020 normals from DULUTH HARBOR STN, MN US.
Year-round temperatures (°F)
Avg high
Avg low
Climate summary
Duluth has an annual average temperature of 40.8°F with about 0 inches of precipitation per year. The warmest month is July (average high 75.2°F), and the coldest is January (average low 4.3°F).
Pleasant months
3 / 12
avg high 65–80°F, low ≥ 50°F
Annual swing
54.4°F
warmest to coldest month
Best time to visit Duluth
Full guide →Climate change signal
All-time records →0 of 366 (0%) of Duluth's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1960s | 83 | |
| 1970s | 55 | |
| 1980s | 76 | |
| 1990s | 86 | |
| 2000s | 66 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 20.8°F | 4.3°F | 12.6°F | in | — | — |
| February | 25.7°F | 8.0°F | 16.9°F | in | — | — |
| March | 34.7°F | 18.6°F | 26.7°F | in | — | — |
| April | 45.3°F | 30.8°F | 38.1°F | in | — | — |
| May | 56.1°F | 40.8°F | 48.4°F | in | — | — |
| June | 66.2°F | 49.0°F | 57.6°F | in | — | — |
| July | 75.2°F | 57.7°F | 66.4°F | in | — | — |
| August | 74.4°F | 59.5°F | 67.0°F | in | — | — |
| September | 66.2°F | 50.8°F | 58.5°F | in | — | — |
| October | 52.1°F | 38.5°F | 45.3°F | in | — | — |
| November | 38.8°F | 25.9°F | 32.3°F | in | — | — |
| December | 26.7°F | 12.8°F | 19.7°F | in | — | — |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when