Upper Sioux Agency State Park Weather Forecast

    • 28
    • 36

    Increasing Clouds

    • 23
    • 42

    Mostly Cloudy

    • 21
    • 31

    Mostly Cloudy

    • 30
    • 41

    Mostly Cloudy

    • 21
    • 47

    Partly Sunny

    • 20
    • 36

    Mostly Cloudy

Today 21 Dec Yellow Medicine

Not as cold. Sunny. Highs in the upper 30s. South Winds 5 to 15 Mph.

Tonight 21 Dec Yellow Medicine

Not as cold. Mostly cloudy. Near steady temperature in the lower 30s. South Winds 5 to 15 Mph.

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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 (2020–Present)

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

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  • Average Low 2020–2025

    37.2 °F

  • Average 2020–2025

    47.7 °F

  • Average High 2020–2025

    58.2 °F
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