Darien Weather Forecast

    • 20
    • 22

    Snow

    • 4
    • 27

    Snow Likely

    • 9
    • 17

    Mostly Cloudy

    • 8
    • 22

    Partly Sunny

    • 12
    • 22

    Mostly Cloudy

    • 20
    • 29

    Mostly Cloudy

    • 17
    • 31

    Mostly Cloudy

Today 30 Dec Walworth

Light snow likely. Little new snow accumulation. Southwest Winds 10 to 15 Mph. Chance of snow 70 percent.

Tonight 30 Dec Walworth

Cloudy. Light snow through around midnight. Snow accumulation up to 1 inch. Lows around 18. West Winds up to 10 Mph. Chance of snow 90 percent.

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Darien Temperature Statistics

December Temperature

Janesville-Rock County (16.8 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    23.6 °F

  • Highest 18 December, 2025

    46.4 °F

Climate (2020–Present)

Janesville-Rock County (16.8 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
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