Big Arm Weather Forecast

    • 34
    • 38

    Rain/Snow Likely

    • 31
    • 42

    Rain/Snow Likely

    • 33
    • 41

    Chance Rain/Snow

    • 31
    • 42

    Rain Likely

    • 31
    • 38

    Chance Rain/Snow

    • 29
    • 39

    Chance Snow

Today 21 Dec Flathead/Mission Valleys

Mostly cloudy. A 20 percent chance of snow in the afternoon. Highs in the 30s.

Tonight 21 Dec Flathead/Mission Valleys

A chance of rain and snow in the Evening, then snow with rain likely after midnight. Chance of precipitation 80 percent. Little or no new snow accumulation. Lows in the mid 20s to lower 30s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

December Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 1 December, 2025

    19.4 °F

  • Average December

    35.6 °F

  • Highest 15 December, 2025

    53.6 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (34.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    57 °F
Get WillyWeather+ to remove ads