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Contents
- The climate of Duluth
- The best time to visit Duluth
- The worst time to visit Duluth
- Spring weather in Duluth
- Summer weather in Duluth
- Autumn weather in Duluth
- Winter weather in Duluth
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The lit Aerial Lift Bridge and two long piers with lighthouses at the ends in Duluth, Minnesota
The climate of Duluth
Duluth, Minnesota, USA, bears a Dfb climate classification in the Köppen system. This indicates a humid continental climate with no dry season and a warm summer. Geographically placed in the northern region of the United States, this city is susceptible to a variety of weather conditions throughout the year.
Beginning with temperature, Duluth sees a clear curve throughout the year. Lower temperatures are prevalent from December to February, with the lowest averages falling to 3.9°F (-15.6°C) in January and rising to 21.4°F (-5.9°C) in March. By contrast, the warmer months from June to August record higher temperatures, averaging between 70.3°F (21.3°C) and 75.7°F (24.3°C).
Relative humidity maintains a steady presence all year round, varying slightly from 72% in May to 91% in January. Rainfall is scattered throughout the year, significantly increasing during the spring and early summer, peaking at 3.03" (77mm) in July. Moreover, the city experiences snowfall heavily in the colder months, with January reporting the highest snowfall at 7.72" (196mm).
Uniquely, the sea temperature remains consistently cold, only slightly warming up from 36°F (2.2°C) in most winter and early spring months to a maximum of 61°F (16.1°C) in late summer. Similarly, the daylight hours in Duluth fluctuate between a low of 8.6 hours in December to a high of 15.8 hours in June which is complemented by the measurable increase in sunshine hours from 2.8 hours in January to 10 hours in July. As for atmospheric conditions, the city reports slightly higher pressure levels in the colder months, averaging at 30.09" (764mm).
Storm chasers may be intrigued by the wind speeds in Duluth; the maximum wind speeds per month peak at 9.3mph (15km/h) in October, while gusts can reach up to 13.2mph (21.2km/h) during the same month.
Beginning with temperature, Duluth sees a clear curve throughout the year. Lower temperatures are prevalent from December to February, with the lowest averages falling to 3.9°F (-15.6°C) in January and rising to 21.4°F (-5.9°C) in March. By contrast, the warmer months from June to August record higher temperatures, averaging between 70.3°F (21.3°C) and 75.7°F (24.3°C).
Relative humidity maintains a steady presence all year round, varying slightly from 72% in May to 91% in January. Rainfall is scattered throughout the year, significantly increasing during the spring and early summer, peaking at 3.03" (77mm) in July. Moreover, the city experiences snowfall heavily in the colder months, with January reporting the highest snowfall at 7.72" (196mm).
Uniquely, the sea temperature remains consistently cold, only slightly warming up from 36°F (2.2°C) in most winter and early spring months to a maximum of 61°F (16.1°C) in late summer. Similarly, the daylight hours in Duluth fluctuate between a low of 8.6 hours in December to a high of 15.8 hours in June which is complemented by the measurable increase in sunshine hours from 2.8 hours in January to 10 hours in July. As for atmospheric conditions, the city reports slightly higher pressure levels in the colder months, averaging at 30.09" (764mm).
Storm chasers may be intrigued by the wind speeds in Duluth; the maximum wind speeds per month peak at 9.3mph (15km/h) in October, while gusts can reach up to 13.2mph (21.2km/h) during the same month.
The best time to visit Duluth
The prime time to explore Duluth falls in the warmer months, particularly between June and September. During this period, the average high temperatures fluctuate around a pleasant 70°F (21.1°C), coupled with typically lower rainfall levels. The daily sunshine duration ranges from 8.3 to 10 hours, allowing ample daylight for outdoor activities.
The worst time to visit Duluth
On the flip side, the onset of winter, primarily from December through to February, can be perceived as the least desirable time to visit Duluth, especially for those not accustomed to frigid temperatures. The high levels of snowfall, frequently exceeding 5" (127mm) in January and February, and average low temperatures ranging between 3.9°F (-15.6°C) to 11.8°F (-11.2°C) can pose challenges for outdoor exploration.
Spring weather in Duluth
As Duluth transitions from winter to spring, the city witnesses a noticeable rise in temperature. From a low of 21.4°F (-5.9°C) in March, the mercury level jumps to 46°F (7.8°C) in April. Evenings remain chilly with temperatures as low as 31.3°F (-0.4°C) in April. Moisture levels also see a hike during these months, with rainfall increasing from 1.54" (39mm) in March to an elevated level of approximately 2.52" (64mm) in April.
Summer weather in Duluth
Summertime in Duluth is a blend of warm and wet conditions. With high temperatures soaring to 77.4°F (25.2°C) in July and staying above 70°F (21.1°C) until September, the weather allows for a variety of outdoor activities. Rainfall reaches its yearly peak during these months, maxing out at 3.03" (77mm) in July, and the increased humidity hovering in the mid-70% range can make the air feel muggy.
Autumn weather in Duluth
Fall ushers in a cooling trend, bringing an end to the warm and wet summer. By October, the high temperature drops to 51.3°F (10.7°C) and plunges further to 36.1°F (2.3°C) by November. The rainfall also reduces significantly, recording an average of 2.36" (60mm) in October and dropping to 1.22" (31mm) in November.
Winter weather in Duluth
Winter is synonymous with harsh and chilly conditions in Duluth. With high temperatures barely rising above the freezing point and dipping further to an average low of 11.8°F (-11.2°C) by December, it is a stark change from the milder seasons. Correspondingly, the city sees substantial snowfall, as high as 7.72" (196mm) in December, turning the city into a frosty landscape. Hence, these months are suitable for those who have a penchant for winter sports or enjoy the cold and snowy ambience.
Weather in January
January in Duluth, Minnesota, exhibits the rigors of winter, endowed with copious amounts of snowfall. The chilly weather continues from the latter weeks of the previous year, the mercury seldom rising above the freezing point. Weather in January »
Weather in February
The second month of the year records somewhat milder weather conditions, a sure sign of the impending spring. Despite these enhancements, February can still be considered a winter month, with the cold weather even affecting the sea temperature. Weather in February »
Weather in March
As residents of Duluth transition from winter to spring, March brings forth an upturn in the weather. The chilly temperatures begin to thaw, with the days getting longer and brighter. There is a notable decrease in snowfall days from February's 18.1 to March's 13.3. Weather in March »
Weather in April
April marks the full arrival of spring in Duluth, which signals bud break and bird migration. Increasing temperatures, longer daylight hours, and dwindling snowfall characterize this month. Overcast features give way to clearer skies, boosting the visibility for outdoor activities. Weather in April »
Weather in May
May offers an overt change in Duluth's weather, inciting residents to welcome the onset of summer. The city benefits from warmer temperatures, copious amounts of sunshine, and minimal snowfall. Adding to the favorable weather, the daily hours of sunshine increase, significantly brightening the city. Weather in May »
Weather in June
Summer invades Duluth in June, with the month known for sultry weather, lesser cloud coverage, and longer daylight hours. June becomes a favorite among residents and tourists for outdoor excursions, thanks to its advantageous weather conditions. Weather in June »
Weather in July
July stands as the climatic culmination of summer in Duluth, characterized by the year's hottest temperatures and longest hours of sunshine. The city basks in warm weather, paving the way for a myriad of outdoor activities. This period's warm, comforting temperatures also cause a considerable surge in sea temperature. Weather in July »
Weather in August
August in Duluth holds onto the summer weather, even though the temperatures show a slight decline from the previous month. The month signals the end of the warmest time of the year, preparing for a transition toward the cooler autumn temperatures. Weather in August »
Weather in September
September acts as a harbinger of autumn in Duluth, minor reductions in temperature, daylight hours, and sea temperature distinguish this month. This period is characterized by frequent weather changes and an upsurge in rainfall. Weather in September »
Weather in October
October in Duluth ushers in a more pronounced autumn chill, necessitating warmer clothing. Residents anticipate the city's vibrant foliage during this month, a clear departure from the previous green summer months. As the weather becomes colder, the sea temperature likewise follows suit. Weather in October »
Weather in November
November introduces Duluth to winter weather, with decreasing daylight, a surge in snowfall, and lowering temperatures. The city, moving steadfast into the colder season, witnesses the first heavy spells of snow. Accompanied by an upturn in humidity, conditions become ideal for snow production. Weather in November »
Weather in December
December endures the peak of the winter season in Duluth, characterized by icy winds, copious snowfall, and minimal sunlight. Though officially the start of winter, the city experiences cold weather that sets new low-temperature records. Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Duluth?
With average temperatures fluctuating between a high of 16.3°F (-8.7°C) and a low of 3.9°F (-15.6°C), January stands out as the coldest month in Duluth.
What is the most humid month in Duluth?
With an average relative humidity of 91%, January is the most humid month.
What is the driest month in Duluth?
January is the month with the least rainfall in Duluth, Minnesota. Rain falls for 3.4 days and accumulates 0.87" (22mm) of precipitation.
How much does it rain in Duluth?
In Duluth, during the entire year, the rain falls for 135.2 days and collects up to 24.53" (623mm) of precipitation.
When does it snow in Duluth?
January through May, October through December are months with snowfall in Duluth, Minnesota.
How much does it snow in Duluth?
Throughout the year, in Duluth, there are 90.9 snowfall days, and 33.27" (845mm) of snow is accumulated.
What are the months with the coldest ocean in Duluth?
January through April, with an average ocean temperature of 35.6°F (2°C), are months with the coldest seawater.
What is the month with the least sunshine in Duluth?
January has the least sunshine of the year in Duluth, with an average of 2.8h of sunshine.
What are the months with the lowest UV index in Duluth?
The months with the lowest UV index in Duluth, Minnesota, are January, February, November and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Duluth?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Duluth, Minnesota, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the least humid month in Duluth?
The least humid month in Duluth, Minnesota, is May, with an average relative humidity of 72%.
When it does not snow in Duluth?
June through September are months without snowfall.
When are the longest days in Duluth?
The month with the longest days in Duluth, Minnesota, is June, with an average of 15h and 48min of daylight.
What is the hottest time of year in Duluth?
In Duluth, July registers the highest temperatures, averaging 77.4°F (25.2°C) at the peak and 57.6°F (14.2°C) at the lowest.
What is the rainiest month in Duluth?
July is the month with the most rainfall. Rain falls for 16.4 days and accumulates 3.03" (77mm) of precipitation.
What month has the most sunshine in Duluth?
The month with the most sunshine in Duluth is July, with an average of 10h of sunshine.
When is the highest UV index in Duluth?
The month with the highest UV index in Duluth is July, with an average maximum UV index of 6.
What is the month with the warmest ocean in Duluth?
The month with the warmest seawater is August, with an average ocean temperature of 60.8°F (16°C).
When does it snow the most in Duluth?
The month with the most snowfall in Duluth, Minnesota, is December, when snow falls for 18.4 days and typically aggregates up to 7.72" (196mm) of snow.
What is the month with the shortest days in Duluth?
December has the shortest days of the year in Duluth, Minnesota, with an average of 8h and 36min of daylight.
Average temperature
Duluth, MN
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (16.3°F).
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (3.9°F).
Average pressure
Duluth, MN
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.93"Hg - Average pressure in September:
29.99"Hg - Average pressure in October:
29.96"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Duluth, MN
- Average wind speed in January:
8.5mph - Average wind speed in February:
8.5mph - Average wind speed in March:
7.9mph - Average wind speed in April:
8.8mph - Average wind speed in May:
7.8mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.5mph - Average wind speed in October:
8.6mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.3mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Duluth, MN
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall
Duluth, MN
- Average rainfall in January:
0.87" - Average rainfall in February:
0.98" - Average rainfall in March:
1.54" - Average rainfall in April:
2.52" - Average rainfall in May:
2.83" - Average rainfall in June:
2.99"
- Average rainfall in July:
3.03" - Average rainfall in August:
2.44" - Average rainfall in September:
2.05" - Average rainfall in October:
2.36" - Average rainfall in November:
1.22" - Average rainfall in December:
1.69"
The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days
Duluth, MN
- Average rainfall days in January:
3.4 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
10 days - Average rainfall days in April:
13.5 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
16.4 days - Average rainfall days in August:
14.7 days - Average rainfall days in September:
13.6 days - Average rainfall days in October:
14.4 days - Average rainfall days in November:
7.1 days - Average rainfall days in December:
5.2 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall
Duluth, MN
The month with the highest snowfall is December (7.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Duluth, MN
- Average snowfall days in January:
20.1 days - Average snowfall days in February:
18.1 days - Average snowfall days in March:
13.3 days - Average snowfall days in April:
7.3 days - Average snowfall days in May:
0.8 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
2.5 days - Average snowfall days in November:
10.4 days - Average snowfall days in December:
18.4 days
The month with the highest number of snowfall days is January (20.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Duluth, MN
The best month for swimming (with the highest average sea temperature) is August (61°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).
Average daylight / Average sunshine
Duluth, MN
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 2min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January:
2h and 5min - Average sunshine in February:
3h and 0min - Average sunshine in March:
4h and 3min - Average sunshine in April:
6h and 5min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 2min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 2min - Average sunshine in October:
4h and 5min - Average sunshine in November:
4h and 1min - Average sunshine in December:
3h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days
Duluth, MN
- Average sunshine days in January:
12.2 days - Average sunshine days in February:
10.4 days - Average sunshine days in March:
11.2 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
10.1 days
- Average sunshine days in July:
11.6 days - Average sunshine days in August:
13 days - Average sunshine days in September:
13.2 days - Average sunshine days in October:
13.5 days - Average sunshine days in November:
13.7 days - Average sunshine days in December:
11.7 days
The month with the most sunshine days is November (13.7 days).
The month with the least sunshine days is June (10.1 days).
Average UV index
Duluth, MN
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover
Duluth, MN
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility
Duluth, MN
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Duluth, Minnesota, USA
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