Upper Mason Lake Weather Forecast

    • 29
    • 40

    Breezy

    • 29
    • 38

    Windy

    • 26
    • 34

    Blizzard

    • 13
    • 31

    Chance Snow

    • 21
    • 28

    Snow Likely

    • 18
    • 31

    Snow Likely

Today 14 Dec Gallatin and Madison County Mountains and Centennial Mountains

Sunny. Highs 36 to 48. South Winds 10 to 15 Mph with Gusts to around 40 Mph.

Tonight 14 Dec Gallatin and Madison County Mountains and Centennial Mountains

Mostly clear. Lows 20 to 32. South Winds 5 to 15 Mph with Gusts to around 35 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Mason Lake Temperature Statistics

December Temperature

Ennis - Big Sky Airport (29.2 miles)

  • Lowest 1 December, 2025

    5 °F

  • Average December

    36.4 °F

  • Highest 11 December, 2025

    57.2 °F

Climate (2020–Present)

Ennis - Big Sky Airport (29.2 miles)

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  • Average Low 2020–2025

    31.6 °F

  • Average 2020–2025

    43.9 °F

  • Average High 2020–2025

    55.8 °F
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