January weather forecast
Sioux Falls, SD

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The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline
The Sioux Falls in South Dakota, flowing downstream over rocks under the perfect evening skyline

Weather in January

The start of the new year in Sioux Falls, South Dakota ushers in chilly weather conditions that envelop the city in a cold blanket. Interestingly, snowfall is at a peak with up to 3.35" (85mm) of snow. This does not deter daylight from shining for up to 9.4 hours, casting an ethereal glow on the snowy landscape, particularly around lunchtime. Humidity levels are higher, fostering frost formation on surfaces, creating a familiar crystal-like cityscape. Overall, January is the epitome of winter bliss in this part of the United States.

Temperature

January is the coldest month of the year in Sioux Falls, registering average temperatures as high as 23.4°F (-4.8°C) and as low as 9.7°F (-12.4°C).

Humidity

With an average relative humidity of 88%, January is the most humid month.

Rainfall

The months with the least rainfall are January, February and November Rain falls for 3.8 days and accumulates 0.67" (17mm) of rain.

Snowfall

January through May, October through December are months with snowfall in Sioux Falls. In Sioux Falls, South Dakota, in January, during 11.8 snowfall days, 3.35" (85mm) of snow is typically accumulated. In Sioux Falls, South Dakota, during the entire year, snow falls for 48.7 days and aggregates up to 18.23" (463mm) of snow.

Daylight

In January, the average length of the day in Sioux Falls, South Dakota, is 9h and 23min.
On the first day of January in Sioux Falls, sunrise is at 7:59 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:36 pm CST.

Sunshine

With an average of 4h of sunshine, January has the least sunshine of the year.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sioux Falls, South Dakota. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in January interprets into the following advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
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Frequently asked questions

What month is the coldest in Sioux Falls?

Sioux Falls experiences its lowest temperatures in January, with an average peak of 23.4°F (-4.8°C) and a low of 9.7°F (-12.4°C).

How cold is it in Sioux Falls in January?

During January, Sioux Falls experiences an average high-temperature of 23.4°F (-4.8°C) and a low-temperature of 9.7°F (-12.4°C).

What is the most humid month in Sioux Falls?

With an average relative humidity of 88%, January is the most humid month in Sioux Falls, South Dakota.

What is the average humidity in January in Sioux Falls?

In January, the average relative humidity in Sioux Falls is 88%.

What is the driest month in Sioux Falls?

The months with the least rainfall in Sioux Falls, South Dakota, are January, February and November Rain falls for 3.8 days and accumulates 0.67" (17mm) of rain.

How much does it rain in Sioux Falls in January?

In Sioux Falls, during January, the rain falls for 3.8 days and regularly aggregates up to 0.67" (17mm) of precipitation.

How much does it snow in Sioux Falls in January?

In January, in Sioux Falls, it is snowing for 11.8 days. Throughout January, 3.35" (85mm) of snow is accumulated.

What is the average length of the day in January in Sioux Falls?

In Sioux Falls, South Dakota, the average day length in January is 9h and 23min.

When is the sunrise / sunset in January in Sioux Falls?

On the first day of January in Sioux Falls, South Dakota, sunrise is at 7:59 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:36 pm CST.

What is the month with the least sunshine in Sioux Falls?

January has the least sunshine of the year in Sioux Falls, South Dakota, with an average of 4h of sunshine.

How long on average sun shines in January in Sioux Falls?

In January, the average sunshine duration in Sioux Falls, South Dakota, is 4h.

When is the lowest UV index in Sioux Falls?

The months with the lowest UV index in Sioux Falls, South Dakota, are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in January in Sioux Falls?

In Sioux Falls, South Dakota, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Sioux Falls, SD

Average temperature in January - Sioux Falls, SD
  • Average high temperature in January: 23.4°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in January: 9.7°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).

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Average pressure in January
Sioux Falls, SD

Average pressure in January - Sioux Falls, SD
  • Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in January
Sioux Falls, SD

Average wind speed in January - Sioux Falls, SD
  • Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (8mph).

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Average humidity in January
Sioux Falls, SD

Average humidity in January - Sioux Falls, SD
  • Average humidity in January: 88%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in January
Sioux Falls, SD

Average rainfall in January - Sioux Falls, SD
  • Average rainfall in January: 0.67"

The wettest month (with the highest rainfall) is June (3.27").
The driest months (with the least rainfall) are January, February and November (0.67").

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Average rainfall days in January
Sioux Falls, SD

Average rainfall days in January - Sioux Falls, SD
  • Average rainfall days in January: 3.8 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).

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Average snowfall in January
Sioux Falls, SD

Average snowfall in January - Sioux Falls, SD
  • Average snowfall in January: 3.35"

The month with the highest snowfall is February (4.25").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Sioux Falls, SD

Average snowfall days in January - Sioux Falls, SD
  • Average snowfall days in January: 11.8 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Sioux Falls, SD

Average daylight in January / Average sunshine in January - Sioux Falls, SD
  • Average daylight in January: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in January: 4h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in January
Sioux Falls, SD

Average sunshine days in January - Sioux Falls, SD
  • Average sunshine days in January: 18.1 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is June (10 days).

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Average UV index in January
Sioux Falls, SD

Average UV index in January - Sioux Falls, SD
  • Average UV index in January: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Sioux Falls, SD

Average cloud cover in January - Sioux Falls, SD
  • Average cloud cover in January: 56

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in January
Sioux Falls, SD

Average visibility in January - Sioux Falls, SD
  • Average visibility in January: 5mi

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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Sioux Falls, South Dakota, USA

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