Sugar River Forest Preserve Weather Forecast

    • 28
    • 38

    Rain Likely

    • 8
    • 43

    Rain Likely

    • 18
    • 25

    Mostly Cloudy

    • 11
    • 39

    Partly Sunny

    • 16
    • 27

    Mostly Cloudy

    • 30
    • 37

    Mostly Cloudy

Today 17 Dec Winnebago

Partly cloudy. Highs in the upper 30s. Northwest Winds 5 to 10 Mph, becoming southeast in the afternoon.

Tonight 17 Dec Winnebago

Mostly cloudy. A slight chance of drizzle after midnight. Drizzle likely late. Breezy with Lows around 30. Temperature rising to around 40 after midnight. South Winds 10 to 15 Mph, increasing to 15 to 20 Mph after midnight. Gusts up to 30 Mph.

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Sugar River Forest Preserve Temperature Statistics

December Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    17 °F

  • Highest 10 December, 2025

    37.4 °F

Climate (2020–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.2 °F
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