Johnstown Center Airport Weather Forecast

    • 33
    • 55

    Rain Likely

    • 23
    • 42

    Rain/Snow Likely

    • 29
    • 36

    Slight Chance Snow

    • 27
    • 50

    Mostly Cloudy

    • 16
    • 34

    Mostly Cloudy

    • 19
    • 29

    Mostly Cloudy

Today 30 Jan Rock

Sunny until late afternoon then becoming partly sunny. Highs in the mid 50s. Southwest Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 30 Jan Rock

Cloudy with a 50 percent chance of light rain. Lows in the mid 30s. South Winds up to 5 Mph shifting to the northeast after midnight.

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Johnstown Center Airport Temperature Statistics

January Temperature

Janesville-Rock County (11.2 miles)

  • Lowest 21 January, 2025

    -13 °F

  • Average January

    16.5 °F

  • Highest 17 January, 2025

    53.6 °F

Climate (2020–Present)

Janesville-Rock County (11.2 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.2 °F
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