Climate and monthly weather forecast
Sisseton, SD

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The climate of Sisseton

Sisseton, South Dakota, falls under the Dfb category of the Köppen climate classification, defined as a humid continental climate with no dry season and warm summers. This classification is attributable to its geographical position in the Midwestern region of the United States. Throughout the year, the climate exhibits vast fluctuations in temperature, precipitation, and other climatic features, leading to pronounced seasonal changes typical of a humid continental climate.

Temperature varies considerably, with the highest average daytime temperature observed at 81.1°F (27.3°C) in July, steadily falling to the coldest month of January with a high temperature of just 19°F (-7.2°C). Nighttime temperatures also exhibit a significant range, from a high of 61.7°F (16.5°C) in July down to a low of 5.4°F (-14.8°C) in January.

Relative humidity trends downward from 89% in January to 65% in September before edging upward again, ending the year at 86% in December. The distribution of rainfall follows a unique pattern, reaching its peak in June with 3.27" (83mm), and bottoming out at 0.55" (14mm) in January. Snowfall is primarily observed from November to April, peaking at 4.29" (109mm) in December. Wind speed also presents variable metrics, with the fastest on average from 10.3mph (16.6km/h) in March to 10.9mph (17.5km/h) in November.

The best time to visit Sisseton

Considering the variable weather scenario, the best time to visit Sisseton would primarily hinge on the planned activities and weather preferences of the visitors. For those desiring a fair amount of sunshine and mild temperatures, May to September may be the ideal window, with average high temperatures swinging from 65.1°F (18.4°C) to a warm 81.1°F (27.3°C) and minimal snowfall. The relative humidity during these months also tends to be lower, ranging from 68% to 77%. This period also enjoys the longest daylight hours - from 14.9 hours in May to 14.1 hours in September - providing ample time for outdoor explorations.

The worst time to visit Sisseton

Contrarily, the coldest months of December, January, and February may prove to be challenging for travel. Daytime temperatures plummet to between 19°F (-7.2°C) and 37.8°F (3.2°C), with nighttime temperatures falling even lower, from 12.6°F (-10.8°C) to 23.4°F (-4.8°C), making it uncomfortable for outdoor activities. These winter months also witness increased snowfall, from 2.6" (66mm) in November escalating to 4.29" (109mm) in December. The shorter daylight hours, between 8.8 hours and 10.4 hours, coupled with reduced visibility because of snowfall, would restrict travel and sightseeing during this period.

Spring weather in Sisseton

Springtime in Sisseton, spanning March to May, exhibits an upward trajectory in temperatures, kicking off at 37.8°F (3.2°C) in March and reaching a comfortable 65.1°F (18.4°C) in May. Simultaneously, the night temperature also shows a steady rise from 23.4°F (-4.8°C) to 48°F (8.9°C). One can expect an escalation of rainfall in spring, commencing at 1.18" (30mm) in March and culminating at 2.48" (63mm) in May. Snowfall primarily occurs in March, with an average of 3.35" (85mm), but fades out by May.

Summer weather in Sisseton

Summers, from June to August, range from warm to hot, with the peak temperature observed at 81.1°F (27.3°C) in July. Nighttime temperatures are also on the higher side, standing at 57°F (13.9°C) in June to 61.7°F (16.5°C) in July. Rainfall reaches its zenith, with June receiving the heaviest downpour of the year, averaging 3.27" (83mm). Summer is also the season with the most extended daylight hours, indicative of longer days and shorter nights.

Autumn weather in Sisseton

Autumn, comprising the months of September to November, sees a downslide in temperatures, with highs decreasing from 72°F (22.2°C) in September to 39.6°F (4.2°C) in November. A parallel drop is observable in nighttime temperatures, slipping from 52°F (11.1°C) to 26.8°F (-2.9°C). Rainfall reduces considerably in autumn, from 1.73" (44mm) in September to 0.75" (19mm) in November. Along with falling temperatures, the daylight hours also decrease, from 12.5 hours in September to 9.5 hours in November.

Winter weather in Sisseton

Winters, from December till February, are characterized by cold temperatures, with daytime highs oscillating between 19°F (-7.2°C) and 37.8°F (3.2°C). Night temperatures can drop significantly, ranging from 12.6°F (-10.8°C) to 23.4°F (-4.8°C), making these months the coldest of the year. An average snowfall from 2.6" (66mm) to 4.29" (109mm) is noted during this period, with the heaviest snowfall in December. Additionally, the daylight hours are shortest in winter, ranging from 8.8 hours in December to 10.4 hours in February.

Weather in January

In Sisseton, South Dakota, January sees temperatures dropping to their most frigid. The weather conditions often present challenges with a pronounced dip in high temperatures to 19°F (-7.2°C), low temperatures making a freeze through at 5.4°F (-14.8°C). Weather in January »

Weather in February

In February, Sisseton experiences a slight improvement in temperatures. It's the last of the sub-freezing months with low temperatures of 8.1°F (-13.3°C) and high temperatures of 21.6°F (-5.8°C). Precipitation dips slightly compared to January, making for drier conditions. Weather in February »

Weather in March

March signals the onset of Spring in Sisseton with temperatures rising noticeably compared to February. High temperatures climb to 37.8°F (3.2°C), and lows advance to 23.4°F (-4.8°C), bidding goodbye to the bitter chill of winter. Weather in March »

Weather in April

April brings warmer weather to Sisseton with a distinctive shift from the cold, harsh winter months. The transition is evident with occasional showers replacing the snowy landscape of prior months. Towards the end of this month, the rain gives way to a greener landscape springing to life. Weather in April »

Weather in May

In Sisseton, May welcomes further warmth with high temperatures soaring to 65.1°F (18.4°C) and low temperatures hovering around 48°F (8.9°C). This significant increase allows for a broad range of outdoor activities as citizens joyfully greet sunny and warm weather. Weather in May »

Weather in June

June is the first month of the year in Sisseton to showcase summer-like temperatures. The highs sweltering at 74.8°F (23.8°C) and the lows settle comfortably at 57°F (13.9°C). The rainfall for June reaches peak levels for the year, with June often being the wettest month. Weather in June »

Weather in July

July can be designated as the peak of summer in Sisseton. With the highest temperatures of the year, peaking at 81.1°F (27.3°C) and lows settling at a comfortable 61.7°F (16.5°C), summer truly shines. These temperatures combine with low precipitation levels compared to June to create ideal conditions for outdoor ventures. Weather in July »

Weather in August

In Sisseton, the weather in August mirrors that of July with similar temperature patterns. Daylight hours shorten slightly compared to July, signaling the imminent arrival of autumn. Despite this, the weather remains warm enough to still enjoy outdoor activities and explore Sisseton's summer landscape. Weather in August »

Weather in September

September ushers in the beginning of Autumn in Sisseton. Pleasant temperatures, a noticeable decrease in rainfall, and consistent wind speed make this one of the optimum months to visit. This time welcomes fall foliage, transforming the city into a scene of vibrant colors. Weather in September »

Weather in October

October, in Sisseton, sees a noticeable decline in temperature. While temperatures in September remain relatively warm, October sees a sharp change. The city picks up on the mist-covered mornings and limited daylight hours. However, as the rain begins to fall less frequently, locals can enjoy the autumn colors in full display. Weather in October »

Weather in November

In November, Sisseton braces itself for the cusp of winter. Compared to October, temperatures fall further with an average high of 39.6°F (4.2°C) and low of 26.8°F (-2.9°C). The season's change makes this month one of the cloudiest of the year. Weather in November »

Weather in December

December, in Sisseton, is evidently a winter month, characterized by frigid temperatures, notably dropping from November. The highs barely climb to 23.5°F (-4.7°C) and lows plummet to 12.6°F (-10.8°C). Resurgent snowfall heralds a return to white landscapes, while a high relative humidity adds to the frosty feel of the season. Weather in December »
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Frequently asked questions

What are the coldest months in Sisseton?

January, on average, is the coldest month in Sisseton, registering a high temperature of 19°F (-7.2°C) and a low of 5.4°F (-14.8°C).

What is the most humid month in Sisseton?

With an average relative humidity of 89%, January is the most humid month in Sisseton, South Dakota.

What is the driest month in Sisseton?

January is the month with the least rainfall in Sisseton, South Dakota. Rain falls for 2.2 days and accumulates 0.55" (14mm) of precipitation.

How many days does it rain in Sisseton?

Throughout the year, in Sisseton, there are 107.9 rainfall days, and 20.63" (524mm) of precipitation is accumulated.

When does it snow in Sisseton?

Months with snowfall in Sisseton, South Dakota, are January through May, October through December.

How much does it snow in Sisseton?

In Sisseton, during the entire year, snow falls for 53.2 days and aggregates up to 20.12" (511mm) of snow.

What is the month with the least sunshine in Sisseton?

January has the least sunshine of the year in Sisseton, with an average of 3.7h of sunshine.

When is Daylight Saving Time (DST) in Sisseton?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Sisseton, 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.

When it does not snow in Sisseton?

June through September are months without snowfall.

When are the longest days in Sisseton?

June has the longest days of the year in Sisseton, South Dakota, with an average of 15h and 36min of daylight.

When is the highest UV index in Sisseton?

June and July, with an average maximum UV index of 6, are months with the highest UV index.

What month is the hottest in Sisseton?

The warmest month in Sisseton is July, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 61.7°F (16.5°C).

What is the wettest month in Sisseton?

July is the month with the most rainfall. Rain falls for 13.6 days and accumulates 3.27" (83mm) of precipitation.

What month has the most sunshine in Sisseton?

The month with the most sunshine in Sisseton is July, with an average of 10.8h of sunshine.

What is the least humid month in Sisseton?

The least humid month is September, with an average relative humidity of 65%.

What is the snowiest month in Sisseton?

The month with the most snowfall in Sisseton is December, when snow falls for 11.5 days and typically aggregates up to 4.29" (109mm) of snow.

What is the month with the shortest days in Sisseton?

With an average of 8h and 48min of daylight, December has the shortest days of the year in Sisseton.

What is the month with the lowest UV index in Sisseton?

The month with the lowest UV index in Sisseton is December, with an average maximum UV index of 1.

Average pressure
Sisseton, SD

Average pressure - Sisseton, SD

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed
Sisseton, SD

Average wind speed - Sisseton, SD

The windiest months (with the highest average wind speed) are April and October (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.3mph).

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Average rainfall
Sisseton, SD

Average rainfall - Sisseton, SD

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days
Sisseton, SD

Average rainfall days - Sisseton, SD

The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (1.6 days).

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Average snowfall
Sisseton, SD

Average snowfall - Sisseton, SD

The month with the highest snowfall is December (4.29").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Sisseton, SD

Average snowfall days - Sisseton, SD

The month with the highest number of snowfall days is December (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Sisseton, SD

Average daylight / Average sunshine - Sisseton, SD

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Sisseton, SD

Average sunshine days - Sisseton, SD

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (10.8 days).

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Average visibility
Sisseton, SD

Average visibility - Sisseton, SD

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

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Sisseton, South Dakota, USA

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