Climate and monthly weather forecast
Dubuque, IA

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A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city
A small railway line in Dubuque, Iowa, set on a hilly and scenic greenery spot overlooking the brown buildings in the rest of the city

The climate of Dubuque

Dubuque, Iowa is characterized by a Humid Continental climate according to the Köppen climate classification. This implies the presence of hot summers with no dry season and noticeable temperature fluctuation throughout the year. Besides, its geographical position in the midwest of the United States contributes to the variation of weather elements.

The weather trends in Dubuque experience significant changes, impacted primarily by temperature and precipitation. Monthly average temperatures range from 12.4°F (-10.9°C) in January to a peak of 79.7°F (26.5°C) in July. Winters are cold while summers are hot, demonstrating the diversity of the climate. Rainfall occurs chiefly between March and August, with May registering the highest amount of rainfall at 3.7" (94mm). Yet, the rainfall pattern is consistent, with a relatively moderate rain falling through the year.

Dubuque's weather uniqueness includes maximum snowfall and daylight duration disparity. Snowfall is exclusive to the cold months, specifically between November and April, peaking at 4.88" (124mm) in January. The daylight duration sees a high of 15.3 hours in June and drops to a mere 9.1 hours in December. This indicates that the hours of daylight directly correspond to the hot and cold seasons.

The best time to visit Dubuque

Consider planning a trip to Dubuque between May and September. During this period, the weather is warm and accommodating, with average temperatures lying between 66.9°F (19.4°C) and 79.7°F (26.5°C). These months not only promise longer days, with daylight amounting to between 14.6 and 15.3 hours but also higher amounts of sunshine, up to 9.7 hours per day. Despite the presence of rainfall, the humidity is manageable, making it a favorable time for outdoor explorations and other leisure activities.

The worst time to visit Dubuque

January and February come out as the least favorable months to visit Dubuque. These months have much colder temperatures, falling between 12.4°F (-10.9°C) to 15.3°F (-9.3°C) that would potentially impact touring agendas negatively by limiting outdoor activities. Additionally, days are much shorter, averaging 9 hours of daylight, reducing the hours for sightseeing. Furthermore, snowfall amounts rise to 4.17" (106mm), increasing the possibility of disruptions in travel plans.

Spring Weather in Dubuque

Springtime in Dubuque features a transition from cold to warmer weather, spanning from March until May. Temperature averages swing from 43.3°F (6.3°C) to 66.9°F (19.4°C). In terms of precipitation, rainfall increases significantly during this period, reaching the annual high of 3.7" (94mm) in May alongside a comparative increase in the number of rainy days, hitting 17.7 in May from 11.1 in March.

Summer Weather in Dubuque

From June to August, Dubuque enjoys hot summer days. Average temperatures hover between 76.3°F (24.6°C) and 79.7°F (26.5°C), with relative humidity ranging from 81% to 84%. Rainfall begins its descending curve but still remains relatively high, especially in June with an average of 3.7" (94mm). Accompanying these are longer daylight durations, reaching up to 15.3 hours, and higher sunshine hours, peaking at 9.7 hours daily.

Autumn Weather in Dubuque

Autumn is Dubuque's transition from hot summer to cold winter, and it stretches from September to November. Temperatures fall gradually, decreasing from 72.5°F (22.5°C) in September to 43.9°F (6.6°C) in November. Precipitation also decreases, and November records significantly lower rainfall at 1.65" (42mm). The relatively mild weather and beautiful fall foliage make it a great time for outdoor activities.

Winter Weather in Dubuque

Winter sets in Dubuque from December to February and is generally cold. The temperature averages swing between 21°F (-6.1°C) to 12.4°F (-10.9°C). Snowfall is typical, peaking at 4.88" (124mm) in January, and thus, road conditions can be challenging. Winter also sees shorter daylight durations, falling to a minimum of 9.1 hours, and lower sunshine durations, reducing to 4 hours daily. Despite the cold, winter sports enthusiasts may enjoy this season.

Weather in January

Dubuque weather in January is characterized by harsh wind chill and cold conditions due to low temperatures. The drastic plunge from December to 12.4°F (-10.9°C) is noticeable at the month's onset. Occasional flurries hit the area with a total snowfall at a high of 4.88" (124mm). Weather in January »

Weather in February

Snow enthusiasts should consider February for a visit to Dubuque, Iowa. The temperatures begin to crawl up slightly from the freezing January lows, setting a gradual transition to spring. The snowfall reduces to 4.17" (106mm) and there's a noticeable increase in daylight hours of 10.6 in comparison to January. Weather in February »

Weather in March

Weather in March indicates the onset of spring in Dubuque, Iowa. The city experiences a remarkable rise in maximum temperatures to 43.3°F (6.3°C). Outdoor activity becomes more achievable as the snowfall decreases significantly to a mere 1.73" (44mm). Weather in March »

Weather in April

As Dubuque marches towards summer, April comes with a reassuring rise in temperature. The city bids goodbye to the last of the snow, which scales down to 1.22" (31mm) and welcomes more daylight hours, setting the stage for more vibrant and energetic activities. Weather in April »

Weather in May

The splendid Dubuque weather in May is a treat for both residents and visitors. As the city inches further into spring, a significant increase in average temperatures up to a high of 66.9°F (19.4°C), introduces more comfortable and warm conditions. Weather in May »

Weather in June

June brings the warm embrace of summer to Dubuque, Iowa. With virtually no snowfall, June is all about clear blue skies, warm temperatures and a notably longer sunshine of 9.3 hours daily. Enjoyable weather conditions facilitate a wide range of activities, from water sports on the Mississippi River to picnics in the city parks. Weather in June »

Weather in July

Summertime in the city is at its zenith in July, touting the highest average temperature for the year in Dubuque at 79.7°F (26.5°C). While daytime temperatures can be quite high, evenings offer a pleasing respite with cooler temperatures and a gentle breeze. Weather in July »

Weather in August

August maintains the warm summer conditions in Dubuque, with temperatures slightly falling from the July highs to 78.6°F (25.9°C). Due to the remaining heat and pleasant conditions, outdoor activities remain widespread and enjoyable. Weather in August »

Weather in September

September brings a soothing transition from summer to fall in Dubuque, Iowa. The temperatures witness a moderate drop to 72.5°F (22.5°C) from the August highs, making it an idyllic month for exploring the city and its surroundings. Weather in September »

Weather in October

October sees a considerable dip in temperatures as Dubuque fully embraces the fall season. The temperatures slide to 58.1°F (14.5°C), marking a stark departure from the prior month's warmth. The onset of the cooler season is complemented by the rich palette of fall foliage splashed across the city. Weather in October »

Weather in November

Dubuque, Iowa, faces a significant drop in temperatures in November. The fall season is on its way out with temperatures falling to a chilling 43.9°F (6.6°C). Traditional fall colors give way to barren trees, and the city prepares for winter. Weather in November »

Weather in December

December represents the return of wintry conditions in Dubuque, Iowa. An evident drop in maximum temperatures to 31.5°F (-0.3°C) from November sets the tone for the festive season. The city wears a blanket of snow in most areas, giving it a traditionally festive look. Weather in December »

Frequently asked questions

What part of the year is the coldest?

Dubuque reaches its average lowest temperatures in January, measuring 25°F (-3.9°C) at the peak and 12.4°F (-10.9°C) at the lowest.

What are the most humid months?

The months with the highest humidity are January and February, with an average relative humidity of 87%.

What is the driest month?

The months with the least rainfall are January and February Rain falls for 4.8 days and accumulates 1.14" (29mm) of rain.

How many days does it rain?

Throughout the year, there are 135.3 rainfall days, and 27.4" (696mm) of precipitation is accumulated.

When does it snow?

January through April, October through December are months with snowfall.

When does it snow the most?

January is the month with the most snowfall. Snow falls for 12.8 days and accumulates 4.88" (124mm) of snow.

How much does it snow?

Throughout the year, there are 43.9 snowfall days, and 17.09" (434mm) of snow is accumulated.

What is the month with the least sunshine?

The month with the least sunshine is January, with an average of 3.5h of sunshine.

What is the month with the lowest UV index?

The months with the lowest UV index are January, November and December, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Dubuque?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 wettest month?

The months with the most rainfall are May and June, with an average 3.7" (94mm) of precipitation.

When it does not snow?

In Dubuque, snow does not fall in May through September.

When are the longest days?

With an average of 15h and 12min of daylight, June has the longest days of the year.

When is the highest UV index?

June is the month with the highest UV index, with an average maximum UV index of 6.

What is the warmest month?

Dubuque witnesses the warmest weather in July, with temperatures averaging a high of 79.7°F (26.5°C) and a low of 62.8°F (17.1°C).

What is the month with the most sunshine?

The months with the most sunshine are July and August, with an average of 9.7h of sunshine.

What is the least humid month?

The least humid month is October, with an average relative humidity of 76%.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 6min of daylight.

Average temperature
Dubuque, IA

Average temperature - Dubuque, IA

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).

The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

Average pressure
Dubuque, IA

Average pressure - Dubuque, IA

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed
Dubuque, IA

Average wind speed - Dubuque, IA

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity
Dubuque, IA

Average humidity - Dubuque, IA

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).

Average rainfall
Dubuque, IA

Average rainfall - Dubuque, IA

The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").

Average rainfall days
Dubuque, IA

Average rainfall days - Dubuque, IA

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).

Average snowfall
Dubuque, IA

Average snowfall - Dubuque, IA

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Dubuque, IA

Average snowfall days - Dubuque, IA

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Dubuque, IA

Average daylight / Average sunshine - Dubuque, IA

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days
Dubuque, IA

Average sunshine days - Dubuque, IA

The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).

Average visibility
Dubuque, IA

Average visibility - Dubuque, IA

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Dubuque, Iowa, USA

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