Robert O Cook Memorial Arboretum Weather Forecast

    • 20
    • 45

    Partly Sunny

    • 30
    • 34

    Rain/Snow Likely

    • 29
    • 50

    Mostly Cloudy

    • 18
    • 36

    Mostly Cloudy

    • 22
    • 30

    Chance Snow

    • 22
    • 36

    Chance Snow

    • 11
    • 31

    Chance Snow

Today 31 Jan Rock

Sunny. North Winds 15 to 20 Mph.

Tonight 31 Jan Rock

Colder. Partly cloudy. Lows in the lower 20s. Northeast Winds 5 to 15 Mph.

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Robert O Cook Memorial Arboretum Temperature Statistics

January Temperature

Janesville-Rock County (6.2 miles)

  • Lowest 21 January, 2025

    -13 °F

  • Average January

    17.1 °F

  • Highest 17 January, 2025

    53.6 °F

Climate (2020–Present)

Janesville-Rock County (6.2 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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