Steffan Reservoir Weather Forecast

    • 33
    • 57

    Increasing Clouds

    • 36
    • 46

    Mostly Cloudy

    • 42
    • 56

    Partly Sunny

    • 15
    • 54

    Partly Sunny

    • 10
    • 22

    Mostly Sunny

    • 18
    • 28

    Partly Sunny

Today 24 Dec Knox

Partly sunny in the Morning, then clearing. Highs in the upper 50s. South Winds around 10 Mph, becoming west in the afternoon.

Tonight 24 Dec Knox

Mostly cloudy. Near steady temperature in the mid 30s. South Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Steffan Reservoir Temperature Statistics

December Temperature

Yankton, Chan Gurney Municipal Airport (11.2 miles)

  • Lowest 14 December, 2025

    -13 °F

  • Average December

    25.1 °F

  • Highest 16 December, 2025

    54 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (11.2 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    61.3 °F
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