Summit Reservoir Weather Forecast

    • 16
    • 31

    Snow

    • 0
    • 19

    Snow Likely

    • 6
    • 15

    Mostly Sunny

    • 16
    • 24

    Partly Sunny

    • 20
    • 30

    Mostly Cloudy

    • 22
    • 33

    Mostly Cloudy

Today 26 Dec Lost River Range

Snow in the morning. Then mostly sunny with a chance of snow in the afternoon. Breezy. Snow accumulation of 1 to 3 Inches. Highs 31 to 39.

Tonight 26 Dec Lost River Range

Mostly cloudy with a chance of snow. Breezy, Colder. Snow accumulation up to 2 Inches. Lows 15 to 24.

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Summit Reservoir Temperature Statistics

December Temperature

Salmon, Lemhi County Airport (58.4 miles)

  • Lowest 1 December, 2025

    12 °F

  • Average December

    33.4 °F

  • Highest 11 December, 2025

    57.9 °F

Climate (2020–Present)

Salmon, Lemhi County Airport (58.4 miles)

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  • Average Low 2020–2025

    32.6 °F

  • Average 2020–2025

    45.6 °F

  • Average High 2020–2025

    58.6 °F
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