Big Trinity Lake Weather Forecast

    • 7
    • 31

    Blizzard

    • 14
    • 22

    Snow

    • 25
    • 29

    Snow

    • 25
    • 30

    Snow

    • 26
    • 30

    Snow Likely

    • 18
    • 31

    Snow

Today 19 Dec Boise Mountains

Rain and snow. Areas of fog this morning. Patchy fog this afternoon. Snow heavy at Times. Chance of precipitation near 100 percent. Little or no snow accumulation across the lower Elevations, with snow accumulation up to 10 Inches over the Mountains. Highs 34 to 47. Temperature falling into the upper 30s this afternoon. Breezy.

Tonight 19 Dec Boise Mountains

Snow likely in the Evening, then partly cloudy after midnight. Patchy fog in the Evening, then Areas of fog after midnight. Chance of snow 70 percent. Snow accumulation up to 1 inch. Much Colder with Lows 8 to 23.

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  • Temperature Real-Time

Big Trinity Lake Temperature Statistics

December Temperature

Boise Air Terminal (40.4 miles)

  • Lowest 1 December, 2025

    21 °F

  • Average December

    41 °F

  • Highest 10 December, 2025

    62.1 °F

Climate (2020–Present)

Boise Air Terminal (40.4 miles)

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  • Average Low 2020–2025

    44 °F

  • Average 2020–2025

    54.7 °F

  • Average High 2020–2025

    65.9 °F
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