Sibley Lake Weather Forecast

    • 30
    • 37

    Slight Chance Snow

    • 27
    • 40

    Mostly Cloudy

    • 31
    • 42

    Mostly Cloudy

    • 29
    • 43

    Chance Snow

    • 25
    • 38

    Slight Chance Snow

    • 22
    • 37

    Slight Chance Snow

Today 21 Dec Northeast Bighorn Mountains

Partly sunny. Slight chance of snow late in the morning. Chance of snow early in the afternoon. Not as cold. Highs in the upper 30s. Southwest Winds 10 to 20 Mph. Chance of precipitation 30 percent.

Tonight 21 Dec Northeast Bighorn Mountains

Partly cloudy. Warmer. Lows in the lower 30s. Southwest Winds 15 to 25 Mph.

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Sibley Lake Temperature Statistics

December Temperature

Sheridan County Airport (22.4 miles)

  • Lowest 1 December, 2025

    1.9 °F

  • Average December

    33.6 °F

  • Highest 17 December, 2025

    63 °F

Climate (2020–Present)

Sheridan County Airport (22.4 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    47.2 °F

  • Average High 2020–2025

    61.5 °F
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