Sugar River Forest Preserve Weather Forecast

    • 16
    • 22

    Chance Snow

    • 29
    • 34

    Rain

    • 10
    • 31

    Slight Chance Snow

    • 5
    • 21

    Chance Snow

    • -4
    • 19

    Mostly Cloudy

    • -7
    • 6

    Cold

Today 8 Dec Winnebago

Mostly cloudy. Near steady temperature around 20. South Winds 5 to 10 Mph.

Tonight 8 Dec Winnebago

Mostly cloudy. A slight chance of snow late in the evening. A chance of snow after Midnight, then a slight chance of snow late. Little or no snow accumulation. Blustery. Lows around 15. Temperature rising into the mid 20s after midnight. South Winds 10 to 15 Mph. Gusts up to 30 Mph 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 4 December, 2025

    -5.8 °F

  • Average December

    19.2 °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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