January weather forecast
South Dakota, USA

January in South Dakota is characterized by its intense cold, typically registering as the coldest month of the entire year. Daytime temperatures often struggle to surpass the freezing point, with average highs below 32°F (0°C). Nightly lows are even more biting, frequently plummeting to 10°F (-12.2°C) across the majority of the state.

The western segment, particularly areas around the Black Hills, experiences slightly moderated temperatures due to its unique geographical influence. However, even these regions are not exempt from the frigid conditions. Moreover, January's chill is notably more pronounced than December's concluding cold and often more severe than the approaching cold in February.

Snowfall is a significant aspect of January's weather. While the plains consistently witness snow during this month, the mountainous regions, especially the Black Hills, can accumulate significant snowfall, occasionally exceeding measures seen in the neighboring months.

In terms of extremes, Usta and McIntosh stand out for their record temperatures. Although not exclusive to January, McIntosh's record of -54°F (-47.8°C) set in February 1936 is a testament to the extreme winter conditions that South Dakota can experience.

Relative to other months, January's consistent snow and cold temperatures sharply contrast the mild and wetter conditions that are typically seen in late spring months like May.

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• Sioux Falls - January »
  The months with the least rainfall in Sioux Falls are January, February and November Rain falls for 3.8 days and accumulates 0.67" (17mm) of rain. 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.
• Rapid City - January »
  In Rapid City, South Dakota, in January, during 9.4 snowfall days, 2.4" (61mm) of snow is typically accumulated. January is the most humid month in Rapid City with an average relative humidity of 77%.
• Aberdeen - January »
  The month with the most snowfall in Aberdeen is January, when snow falls for 13 days and typically aggregates up to 3.82" (97mm) of snow. The month of January sees the average lowest temperatures in Aberdeen reaching 20.7°F (-6.3°C) at the peak and 6.3°F (-14.3°C) at the low.
• Brookings - January »
  In Brookings in January, snow falls for 14.4 days, with typically accumulated 4.13" (105mm) of snow. In Brookings in January, it is raining for 3.2 days, with typically 0.71" (18mm) of accumulated precipitation.
• Watertown - January »
  The months with the most snowfall in Watertown are January and December, with an average 3.74" (95mm) of accumulated snow. The months with the lowest UV index in Watertown, South Dakota, are January and December, with an average maximum UV index of 1.
• Mitchell - January »
  With an average relative humidity of 87%, January is the most humid month in Mitchell, South Dakota. In Mitchell, South Dakota, in January, during 2.6 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.
• Yankton - January »
  With an average relative humidity of 85%, January is the most humid month in Yankton, South Dakota. With an average relative humidity of 85%, January is the most humid month in Yankton, South Dakota.
• Pierre - January »
  The month with the least rainfall in Pierre is January, when the rain falls for 2.7 days and typically collects 0.35" (9mm) of precipitation. On the first day of January sunrise is at 8:17 am and sunset at 5:12 pm.
• Huron - January »
  The month with the least rainfall in Huron is January, when the rain falls for 2.7 days and typically collects 0.55" (14mm) of precipitation. The month with the least rainfall in Huron is January, when the rain falls for 2.7 days and typically collects 0.55" (14mm) of precipitation.
• Spearfish - January »
  In Spearfish in January, snow falls for 9.7 days, with typically accumulated 3.31" (84mm) of snow. In Spearfish in January, during 3 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.
• Vermillion - January »
  The months with the least rainfall in Vermillion are January and February Rain falls for 2.8 days and accumulates 0.63" (16mm) of rain. In Vermillion in January, snow falls for 6.5 days, with typically accumulated 2.83" (72mm) of snow.
• Brandon - January »
  January is the coldest month of the year in Brandon registering average temperatures as high as 22.8°F (-5.1°C) and as low as 9.3°F (-12.6°C). January is the coldest month in Brandon, South Dakota, exhibiting average temperatures of 22.8°F (-5.1°C) at the peak and 9.3°F (-12.6°C) at the base.