Johnstown Center Airport Weather Forecast

    • 7
    • 45

    Rain

    • 15
    • 20

    Mostly Cloudy

    • 9
    • 37

    Partly Sunny

    • 13
    • 23

    Partly Sunny

    • 30
    • 35

    Mostly Cloudy

    • 28
    • 42

    Mostly Cloudy

    • 34
    • 43

    Mostly Cloudy

Today 18 Dec Rock

Cloudy. West Winds 15 to 20 Mph with Gusts to around 35 Mph.

Tonight 18 Dec Rock

Colder, Breezy, cloudy. Snow Showers likely in the Evening, then slight chance of snow Showers in the late evening and early morning. Little snow accumulation. Lows around 8. West Winds 20 to 25 Mph. Chance of snow 60 percent.

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Johnstown Center Airport Temperature Statistics

December Temperature

Janesville-Rock County (11.2 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    17.3 °F

  • Highest 10 December, 2025

    37.4 °F

Climate (2020–Present)

Janesville-Rock County (11.2 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.2 °F
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