Deep Lake Weather Forecast

    • 27
    • 31

    Snow

    • 31
    • 33

    Chance Snow

    • 29
    • 35

    Snow

    • 24
    • 33

    Chance Snow

    • 13
    • 26

    Blizzard

    • 12
    • 19

    Mostly Cloudy

    • 18
    • 24

    Mostly Cloudy

Today 22 Dec Gallatin and Madison County Mountains and Centennial Mountains

Chance of snow and rain. New snow accumulation up to 3 Inches. Total snow accumulation up to 5 Inches. Snow level 6800 feet. Highs 32 to 40. Southwest Winds 10 to 15 Mph with Gusts to around 40 Mph. Chance of precipitation near 100 percent.

Tonight 22 Dec Gallatin and Madison County Mountains and Centennial Mountains

Cloudy. Chance of snow and rain through the night. Near steady temperature in the lower 30s. South Winds 10 to 20 Mph. Gusts up to 40 Mph increasing to 50 Mph after midnight. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Deep Lake Temperature Statistics

December Temperature

Ennis - Big Sky Airport (28 miles)

  • Lowest 1 December, 2025

    5 °F

  • Average December

    37.9 °F

  • Highest 14 December, 2025

    60.8 °F

Climate (2020–Present)

Ennis - Big Sky Airport (28 miles)

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  • Average Low 2020–2025

    31.6 °F

  • Average 2020–2025

    44 °F

  • Average High 2020–2025

    55.9 °F
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