Sugar River Forest Preserve Weather Forecast

    • 19
    • 26

    Mostly Cloudy

    • 18
    • 25

    Chance Snow

    • 0
    • 21

    Mostly Cloudy

    • 12
    • 20

    Mostly Cloudy

    • 27
    • 35

    Chance Snow

    • 12
    • 34

    Chance Rain/Snow

Today 5 Dec Winnebago

Mostly cloudy. Highs in the mid 20s. Southwest Winds 10 to 15 Mph.

Tonight 5 Dec Winnebago

Mostly cloudy. A chance of snow in the evening. Areas of freezing drizzle late in the Evening, then patchy freezing drizzle after midnight. Little or no snow accumulation. Lows around 20. Southwest Winds around 10 Mph, becoming west after midnight. Chance of precipitation 30 percent.

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Sugar River Forest Preserve Temperature Statistics

December Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 1 December, 2025

    5 °F

  • Average December

    21.2 °F

  • Highest 3 December, 2025

    32 °F

Climate (2020–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.3 °F
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