Climate and monthly weather forecast
Superior, WI

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The climate of Superior

Superior is located in Wisconsin, USA, and is characterized by a Humid continental climate, with no dry season and warm summers, according to the Köppen climate classification (Dfb). Throughout the year, this city experiences a vast spectrum of meteorological conditions.

Monthly average temperatures swing between a chilly 4.1°F (-15.5°C) in January to warm 77.7°F (25.4°C) in July. Superior residents, therefore, bear witness to frigid winters and pleasant summers. Moreover, even the lowest temperatures marginally rise from 4.1°F (-15.5°C) in January to 7.7°F (-13.5°C) in February, demonstrating the sharp contrast in the seasonal weather patterns.

Rainfall is another important aspect of Superior's climate, varying from 0.16" (4mm) in the dry months of January and February to 0.67" (17mm) in the wettest month of July. Even in its driest months, the city receives some precipitation, underscoring the absence of a dry season.

The city’s monthly mean relative humidity fluctuates, peaking at 91% in January and dipping to its lowest at 72% in May. Coupled with the average wind speeds that hover from 6.6mph (10.6km/h) during the warmer months to 8.9mph (14.3km/h) in cooler periods, it depicts Superior as a region with a diverse climate.

The best time to visit Superior

Taking into consideration the different parameters, the most favourable time to visit Superior is between May and September. During these months, temperatures range comfortably between 42.1°F (5.6°C) and 77.7°F (25.4°C), making it suitable for sightseeing and other outdoor activities. Additionally, daylight hours peak at around 15.8 hours in June, providing ample sunlight for daily excursions.

In terms of UV protection, visitors should be aware that UV index readings during this period are between 4 and 6. As for rainfall, these months, with the exception of July, sport relatively less precipitation, providing a drier backdrop for a visit.

The worst time to visit Superior

The months from December to March might not be ideal for a visit due to harsh weather conditions. Temperature readings drop drastically from 22.1°F (-5.5°C) to 4.1°F (-15.5°C), and the city receives up to 0.98" (25mm) of snow. The number of sunshine hours also reduce to approximately 3 hours in December, resulting in shorter days.

Spring weather in Superior

Spring sees temperatures gradually rising from 34.7°F (1.5°C) in March to 61.3°F (16.3°C) in May. This period is quite wet, with average rainfall increasing from 0.24" (6mm) to 0.47" (12mm) over the three months. While sunshine hours increase, from 4.5 hours in March to 8.6 hours in May, relative humidity decreases from 86% to 72%. The average wind speed also decreases marginally, from 7.8mph (12.6km/h) in March to 7.7mph (12.4km/h) in May.

Summer weather in Superior

Summers are pleasantly warm, with temperatures ramping up to an average of 77.7°F (25.4°C) in July from 70.5°F (21.4°C) in June. However, even during these warmer months, temperatures never become unbearably hot. Rainfall peaks during July at 0.67" (17mm) and drops back to 0.39" (10mm) by August. As for sunlight, the city enjoys a ample average of 10 sunshine hours per day. Wind speeds during summer average at around 6.6mph (10.6km/h).

Autumn weather in Superior

Autumn weather in Superior sees the temperatures reduce significantly from 67.1°F (19.5°C) in September to a cooler 36.5°F (2.5°C) by November. Accompanying the temperature drop is a reduction in rainfall, which averages between 0.47" (12mm) in October and 0.2" (5mm) in November. However, the amount of daily sunshine decreases from 8.2 hours in September to 4.1 hours by November, indicating the shorter autumn days in Superior.

Winter weather in Superior

Winters in Superior are cold and long, with December witnessing an average low temperature of 22.1°F (-5.5°C), falling further to 4.1°F (-15.5°C) in January, and slightly increasing to 7.7°F (-13.5°C) in February. There are averagely 9.4 sunshine hours in December, which decreases to 8.6 hours by February. The city also experiences considerable snowfall, with up to 0.98" (25mm) in December, thereby adding to the chilly weather during this period. Wind speeds are at their peak, averaging between 8.3mph (13.4km/h) and 9.1mph (14.6km/h).

Weather in January

January sees the coldest period of the year in Superior, Wisconsin, providing an ideal setting for winter activities. Snowfall proves profound during this month, peaking to 0.59" (15mm), making January an exciting period for snow enthusiasts. Weather in January »

Weather in February

As February slides out of the depths of winter, Superior sees a small but crucial leap in temperature. February's snowfall is no less than the preceding month, measuring at 0.63" (16mm). Though winter reigns supreme, an increase in daylight hours hints at the arrival of spring. Weather in February »

Weather in March

March sweeps in with visible signs of spring, shifting away from the winters' firm grasp. A significant increase marks the month with peaks in temperature reaching 34.7°F (1.5°C). Snow gives way to rainfall, offering a welcome respite to those yearning for warmer days. Weather in March »

Weather in April

April in Superior is characterized by a delightful spring ambiance. A standout feature of this month is an increase in average temperatures, soaring to a comfortable 46°F (7.8°C). Nature begins its revival, with budding trees and sprouting flowers, painting a colorful canvas all around. Weather in April »

Weather in May

May marks the onset of summer in Superior with an enveloping warmth and an increase in sunlight hours. An exciting wave of change is marked by the highest rainfall for the year, measured at 0.47" (12mm). Charter fishing begins in full swing, taking advantage of the warmer waters. Weather in May »

Weather in June

June greets Superior with fully entrenched summer. It becomes moderately warmer, inviting residents and tourists alike to indulge in outdoor activities and bask in the gracious amounts of sunshine. Surprisingly, a notable drop in rain levels provides a near-perfect environment for camping and other outdoor explorations. Weather in June »

Weather in July

July is the prime of summer in Superior, showcasing long, warm days perfect for beach visits and barbeques. The highest average temperatures of the year soar to 77.7°F (25.4°C), marking July as the warmest month. Festivals and parades are a routine occurrence, enhancing the city's vibrant summer atmosphere. Weather in July »

Weather in August

August in Superior is characterized by continued summer warmth with temperatures comparable to July. Despite an identical temperature trend, a dip in rainfall turns August into a drier month. Superior's numerous beaches provide the ideal escape from the prevalent heat. Weather in August »

Weather in September

September welcomes the arrival of fall in Superior with a noticeable decrease in temperature. A decrease in humidity differentiates it from preceding months, delivering a fresh, crisp quality to the air. Colorful fall foliage starts to appear, transforming the landscape into a multi-colored canvas. Weather in September »

Weather in October

October in Superior is synonymous with striking fall colors and a significant drop in temperatures. Unsurprisingly, this month witnesses the first snowflakes of the year, measuring at 0.04" (1mm). Unpredictable weather patterns make it a perfect time for sweater-weather lovers. Weather in October »

Weather in November

November in Superior brings the first touch of winter with a stark decrease in temperature. November’s snowfall records an average of 0.39" (10mm), signifying the commencement of the frosty season. Hibernation period for numerous species begins, transforming the bustling summer trails into quiet, snow-dusted paths. Weather in November »

Weather in December

December in Superior welcomes the harsh yet beautiful winter, characterized by frigid temperatures and snowfall. Snow rules the weather scenario, with an impressive 0.98" (25mm) registered during the month, the most substantial of the year. Weather in December »
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest in Superior?

Superior reaches its average lowest temperatures in January, measuring 17.1°F (-8.3°C) at the peak and 4.1°F (-15.5°C) at the lowest.

What is the most humid month?

With an average relative humidity of 91%, January is the most humid month.

What is the driest month in Superior?

The months with the least rainfall are January and February Rain falls for 1.1 days and accumulates 0.16" (4mm) of rain.

How many days does it rain?

In Superior, during the entire year, the rain falls for 55.7 days and collects up to 4.33" (110mm) of precipitation.

When does it snow?

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

How many days does it snow?

In Superior, during the entire year, snow falls for 42.8 days and aggregates up to 3.39" (86mm) of snow.

What is the month with the least sunshine?

With an average of 2.8h of sunshine, January has the least sunshine of the year.

When is the lowest UV index?

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

When is Daylight Saving Time (DST)?

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 least humid month?

With an average relative humidity of 72%, May is the least humid month.

When it does not snow?

In Superior, snow does not fall in June through September.

When are the longest days?

June has the longest days of the year, with an average of 15h and 48min of daylight.

What month is the hottest?

In Superior, July records the average highest temperatures, peaking at 77.7°F (25.4°C) and reaching a low of 57.7°F (14.3°C).

What is the rainiest month?

July is the month with the most rainfall. Rain falls for 6.7 days and accumulates 0.67" (17mm) of precipitation.

What month has the most sunshine?

With an average of 10.1h of sunshine, July has the most sunshine of the year.

When is the highest UV index?

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

What is the snowiest month?

The month with the most snowfall is December, when snow falls for 9.3 days and typically aggregates up to 0.98" (25mm) of snow.

What is the month with the shortest days in Superior?

The month with the shortest days is December, with an average of 8h and 36min of daylight.

Average temperature
Superior, WI

Average temperature - Superior, WI

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (17.1°F).

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (4.1°F).

Average pressure
Superior, WI

Average pressure - Superior, WI

The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed
Superior, WI

Average wind speed - Superior, WI

The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity
Superior, WI

Average humidity - Superior, WI

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).

Average rainfall
Superior, WI

Average rainfall - Superior, WI

The wettest month (with the highest rainfall) is July (0.67").
The driest months (with the least rainfall) are January and February (0.16").

Average rainfall days
Superior, WI

Average rainfall days - Superior, WI

The month with the highest number of rainy days is May (7.9 days).
The month with the least rainy days is February (0.5 days).

Average snowfall
Superior, WI

Average snowfall - Superior, WI

The month with the highest snowfall is December (0.98").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Superior, WI

Average snowfall days - Superior, WI

The months with the highest number of snowfall days are January and December (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Superior, WI

Average daylight / Average sunshine - Superior, WI

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).

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days
Superior, WI

Average sunshine days - Superior, WI

The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is April (19.9 days).

Average UV index
Superior, WI

Average UV index - Superior, WI

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 visibility
Superior, WI

Average visibility - Superior, WI

The months with the highest visibility are April, May, June, July, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

Superior, Wisconsin, USA

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