Deerfield Lake Weather Forecast

    • 30
    • 51

    Increasing Clouds

    • 12
    • 42

    Rain Likely

    • 18
    • 25

    Mostly Cloudy

    • 23
    • 45

    Chance Rain/Snow

    • 18
    • 31

    Slight Chance Snow

    • 27
    • 38

    Partly Sunny

    • 28
    • 45

    Partly Sunny

Today 16 Dec Northern Black Hills

Mostly sunny with a 20 percent chance of rain. Highs in the 40s to upper 50s. Northwest Winds 5 to 10 Mph with Gusts up to 30 Mph.

Tonight 16 Dec Northern Black Hills

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Deerfield Lake Temperature Statistics

December Temperature

Custer, Custer County Airport (21.1 miles)

  • Lowest 1 December, 2025

    7 °F

  • Average December

    29.1 °F

  • Highest 14 December, 2025

    57 °F

Climate (2020–Present)

Custer, Custer County Airport (21.1 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    44.8 °F

  • Average High 2020–2025

    56.2 °F
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