Johnstown Weather Forecast

    • 32
    • 55

    Partly Sunny

    • 23
    • 58

    Mostly Sunny

    • 29
    • 55

    Partly Sunny

    • 30
    • 60

    Mostly Sunny

    • 34
    • 62

    Partly Sunny

    • 29
    • 63

    Partly Sunny

Today 12 Dec Central and South Weld County

Partly cloudy. Highs in the mid to upper 50s.

Tonight 12 Dec Central and South Weld County

Partly cloudy. Lows 26 to 36.

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Johnstown Temperature Statistics

December Temperature

Fort Collins/Loveland - Northern Colorado Regional Airport (9.3 miles)

  • Lowest 4 December, 2025

    7 °F

  • Average December

    33.2 °F

  • Highest 9 December, 2025

    63 °F

Climate (2020–Present)

Fort Collins/Loveland - Northern Colorado Regional Airport (9.3 miles)

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  • Average Low 2020–2025

    37.9 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    65.1 °F
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