Robert O Cook Memorial Arboretum Weather Forecast

    • 49
    • 62

    Rain Showers

    • 47
    • 56

    Rain Showers

    • 39
    • 61

    Chance Rain Showers

    • 40
    • 59

    Mostly Sunny

    • 47
    • 69

    Slight Chance Rain Showers

    • 48
    • 71

    Slight Chance Rain Showers

    • 51
    • 74

    Partly Sunny

Today 30 Apr Rock

Cloudy with a 20 percent chance of light Showers. Southeast Winds around 10 Mph.

Tonight 30 Apr Rock

Not as cool. Cloudy. Chance of light rain Showers through around Midnight, then rain Showers and slight chance of Thunderstorms after midnight. Locally heavy rainfall possible early in the morning. Lows in the upper 40s. East Winds 5 to 10 Mph. Chance of precipitation 90 percent.

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Robert O Cook Memorial Arboretum Temperature Statistics

April Temperature

Janesville-Rock County (6.2 miles)

  • Lowest 8 April, 2025

    19.4 °F

  • Average April

    45.5 °F

  • Highest 28 April, 2025

    82.4 °F

Climate (2020–Present)

Janesville-Rock County (6.2 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    60.4 °F
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