Johnstown Weather Forecast

    • 17
    • 29

    Blustery

    • 28
    • 63

    Partly Sunny

    • 23
    • 44

    Partly Sunny

    • 35
    • 50

    Mostly Cloudy

    • 33
    • 68

    Partly Sunny

    • 35
    • 57

    Mostly Cloudy

    • 37
    • 63

    Partly Sunny

Today 18 Dec Brown

Strong Winds. Sunny. Near steady temperature in the upper 20s. Northwest Winds 25 to 45 Mph with Gusts to around 60 Mph.

Tonight 18 Dec Brown

Mostly clear. Lows around 17. Temperature rising into the in the lower 20s after midnight. Northwest Winds around 10 Mph, becoming south after midnight.

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Johnstown Temperature Statistics

December Temperature

Ainsworth Regional Airport (2.5 miles)

  • Lowest 13 December, 2025

    -3.8 °F

  • Average December

    30.5 °F

  • Highest 16 December, 2025

    66.6 °F

Climate (2020–Present)

Ainsworth Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    37.7 °F

  • Average 2020–2025

    49.4 °F

  • Average High 2020–2025

    61.8 °F
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