Robert O Cook Memorial Arboretum Weather Forecast

    • 51
    • 76

    Thunderstorms

    • 28
    • 54

    Chance Rain/Snow

    • 28
    • 42

    Slight Chance Snow

    • 41
    • 59

    Mostly Sunny

    • 46
    • 67

    Mostly Cloudy

    • 27
    • 59

    Rain/Snow Likely

Today 14 Mar Rock

Warmer, breezy. Partly sunny. Highs in the upper 70s. South Winds 15 to 25 Mph.

Tonight 14 Mar Rock

Breezy. Partly cloudy in the Evening, then rain and Thunderstorms late in the evening. Partly cloudy with chance of light rain and Thunderstorms after Midnight, then partly cloudy early in the morning. Lows in the lower 50s. South Winds 15 to 25 Mph. Gusts up to 40 Mph through around midnight. Chance of precipitation near 100 percent.

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Robert O Cook Memorial Arboretum Temperature Statistics

March Temperature

Janesville-Rock County (6.2 miles)

  • Lowest 2 March, 2025

    12.2 °F

  • Average March

    35.2 °F

  • Highest 10 March, 2025

    68 °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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