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Duluth, Minnesota climate
Dfb Warm-summer humid continental
Duluth has a strongly seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 76°F, while the coldest is January averaging around 6°F at night. Precipitation totals about 31 inches a year and is strongly seasonal — June alone averages 4.6 inches while January barely receives 0.81 inches. Winters bring significant snowfall (56 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsDuluth climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 23 | 27 | 36 | 46 | 57 | 67 | 76 | 75 | 67 | 53 | 39 | 27 |
| Avg temp (°F) | 14 | 18 | 29 | 39 | 49 | 58 | 67 | 66 | 58 | 46 | 32 | 20 |
| Avg low (°F) | 6 | 9 | 21 | 32 | 41 | 50 | 58 | 58 | 50 | 39 | 26 | 13 |
| Precipitation (in) | 0.8 | 0.9 | 1.4 | 2.6 | 3.4 | 4.6 | 3.9 | 3.9 | 3.4 | 3.2 | 2.1 | 1.3 |
| Snowfall (in) | 14.5 | 12.4 | 9.1 | 1.7 | — | — | — | — | — | 0.2 | 5.8 | 12.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 23 | 27 | 36 | 46 | 57 | 67 |
| Avg temp (°F) | 14 | 18 | 29 | 39 | 49 | 58 |
| Avg low (°F) | 6 | 9 | 21 | 32 | 41 | 50 |
| Precipitation (in) | 0.8 | 0.9 | 1.4 | 2.6 | 3.4 | 4.6 |
| Snowfall (in) | 14.5 | 12.4 | 9.1 | 1.7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 76 | 75 | 67 | 53 | 39 | 27 |
| Avg temp (°F) | 67 | 66 | 58 | 46 | 32 | 20 |
| Avg low (°F) | 58 | 58 | 50 | 39 | 26 | 13 |
| Precipitation (in) | 3.9 | 3.9 | 3.4 | 3.2 | 2.1 | 1.3 |
| Snowfall (in) | — | — | — | 0.2 | 5.8 | 12.3 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 5 | 7 | 8 | 12 | 11 | 10 | 9 | 9 | 10 | 8 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.0 | 0.5 | 2 | 0.8 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 29 | 26 | 26 | 13 | 2 | 0.1 | — | — | 0.5 | 6 | 22 | 30 |
| Days with snowfall ≥ 1 in (days) | 4 | 4 | 3 | 1 | — | — | — | — | — | 0.1 | 2 | 4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 5 | 7 | 8 | 12 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.0 | 0.5 |
| Days with low ≤ 32°F (days) | 29 | 26 | 26 | 13 | 2 | 0.1 |
| Days with snowfall ≥ 1 in (days) | 4 | 4 | 3 | 1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 10 | 8 | 7 |
| Days with high ≥ 90°F (days) | 2 | 0.8 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.5 | 6 | 22 | 30 |
| Days with snowfall ≥ 1 in (days) | — | — | — | 0.1 | 2 | 4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 60 | 63 | 65 | 66 | 63 | 54 | 54 | 59 | 67 | 69 | 67 |
| Clear days (≤ 30% cloud) | 4 | 5 | 5 | 5 | 5 | 4 | 7 | 8 | 7 | 5 | 4 | 4 |
| Partly cloudy days (30–70%) | 13 | 11 | 11 | 9 | 10 | 12 | 14 | 13 | 11 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 14 | 12 | 15 | 16 | 16 | 14 | 10 | 10 | 12 | 17 | 17 | 17 |
| Relative humidity (%) | 95 | 92 | 83 | 75 | 75 | 77 | 75 | 73 | 74 | 78 | 84 | 92 |
| Wind speed (mph) | 7.0 | 7.3 | 6.6 | 6.2 | 5.1 | 4.6 | 4.3 | 4.4 | 5.1 | 5.5 | 6.0 | 6.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 60 | 63 | 65 | 66 | 63 |
| Clear days (≤ 30% cloud) | 4 | 5 | 5 | 5 | 5 | 4 |
| Partly cloudy days (30–70%) | 13 | 11 | 11 | 9 | 10 | 12 |
| Cloudy days (≥ 70%) | 14 | 12 | 15 | 16 | 16 | 14 |
| Relative humidity (%) | 95 | 92 | 83 | 75 | 75 | 77 |
| Wind speed (mph) | 7.0 | 7.3 | 6.6 | 6.2 | 5.1 | 4.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 54 | 59 | 67 | 69 | 67 |
| Clear days (≤ 30% cloud) | 7 | 8 | 7 | 5 | 4 | 4 |
| Partly cloudy days (30–70%) | 14 | 13 | 11 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 10 | 10 | 12 | 17 | 17 | 17 |
| Relative humidity (%) | 75 | 73 | 74 | 78 | 84 | 92 |
| Wind speed (mph) | 4.3 | 4.4 | 5.1 | 5.5 | 6.0 | 6.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Superior (NOAA GHCN station USC00478349), about 7 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.