Upper Sioux Agency State Park Weather Forecast

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    Mostly Cloudy

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Today 31 Dec Yellow Medicine

Mostly cloudy. Highs in the mid 30s. Temperatures falling into the mid teens in the afternoon. North Winds 15 to 20 Mph.

Tonight 31 Dec Yellow Medicine

Much Colder. Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows around 2. North Winds 5 to 15 Mph shifting to the northwest up to 5 Mph after midnight.

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Upper Sioux Agency State Park Temperature Statistics

December Temperature

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

  • Lowest 4 December, 2025

    -12.1 °F

  • Average December

    17.8 °F

  • Highest 9 December, 2025

    40.1 °F

Climate (2021–Present)

Granite Falls, Granite Falls Municipal Airport/Lenzen-Roe Memorial Field (5.6 miles)

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  • Average Low 2021–2025

    37.4 °F

  • Average 2021–2025

    47.9 °F

  • Average High 2021–2025

    58.3 °F
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