Ackley Lake State Park Weather Forecast

    • -5
    • 17

    Slight Chance Snow

    • -7
    • 8

    Mostly Cloudy

    • 5
    • 22

    Mostly Cloudy

    • 14
    • 33

    Partly Sunny

    • 18
    • 38

    Partly Sunny

    • 16
    • 38

    Mostly Cloudy

Today 22 Jan Judith Basin County and Judith Gap

Partly sunny until late afternoon then becoming cloudy. A 50 percent chance of snow late in the afternoon. Highs around 17. North Winds up to 15 Mph.

Tonight 22 Jan Judith Basin County and Judith Gap

Colder. Cloudy with a 50 percent chance of snow. Lows around 5 below. Northeast Winds up to 10 Mph.

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  • Temperature Real-Time

Ackley Lake State Park Temperature Statistics

January Temperature

Lewistown, Lewistown Municipal Airport (22.4 miles)

  • Lowest 17 January, 2026

    12 °F

  • Average January

    36.4 °F

  • Highest 14 January, 2026

    64 °F

Climate (2021–Present)

Lewistown, Lewistown Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    32.4 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    56.6 °F
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