Flat Mountain Arm Weather Forecast

    • 16
    • 44

    Mostly Sunny

    • 24
    • 41

    Chance Snow Showers

    • 26
    • 36

    Snow Showers

    • 9
    • 35

    Snow Showers

    • 19
    • 28

    Snow Showers

    • 15
    • 33

    Snow Showers

Today 14 Dec Yellowstone National Park

Mostly sunny and breezy. Highs in the lower 40s. South Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 14 Dec Yellowstone National Park

Mostly clear and cold. Near steady temperature in the lower 20s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Mountain Arm Temperature Statistics

December Temperature

Yellowstone Lake (11.2 miles)

  • Lowest 1 December, 2025

    -2 °F

  • Average December

    24 °F

  • Highest 10 December, 2025

    36 °F

Climate (2020–Present)

Yellowstone Lake (11.2 miles)

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

  • Average Low 2020–2025

    22.7 °F

  • Average 2020–2025

    35.5 °F

  • Average High 2020–2025

    48.2 °F
Get WillyWeather+ to remove ads