Keystone Weather Forecast

    • 42
    • 51

    Mostly Cloudy

    • 33
    • 58

    Partly Sunny

    • 46
    • 57

    Mostly Cloudy

    • 45
    • 60

    Partly Sunny

    • 34
    • 54

    Partly Sunny

    • 34
    • 52

    Mostly Sunny

Today 21 Dec Central Black Hills

Partly cloudy this Morning, then mostly cloudy with a chance of Sprinkles this afternoon. Highs in the upper 40s. Southwest Winds 5 to 10 Mph. Gusts up to 25 Mph this afternoon.

Tonight 21 Dec Central Black Hills

Partly cloudy. Not as cool with Lows in the upper 30s. West Winds 10 to 20 Mph with Gusts up to 40 Mph.

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Keystone Temperature Statistics

December Temperature

Custer, Custer County Airport (14.9 miles)

  • Lowest 1 December, 2025

    7 °F

  • Average December

    31.5 °F

  • Highest 14 December, 2025

    57 °F

Climate (2020–Present)

Custer, Custer County Airport (14.9 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    44.9 °F

  • Average High 2020–2025

    56.2 °F
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