Sugar River Forest Preserve Weather Forecast

    • -2
    • 13

    Cold

    • 21
    • 27

    Mostly Cloudy

    • 12
    • 25

    Chance Snow

    • -4
    • 20

    Mostly Cloudy

    • 12
    • 21

    Mostly Cloudy

    • 19
    • 30

    Chance Snow

    • 7
    • 31

    Chance Rain/Snow

Today 4 Dec Winnebago

Sunny. Very cold. Highs around 16. North Winds around 5 Mph, becoming southwest in the afternoon.

Tonight 4 Dec Winnebago

Clear in the Evening, then becoming partly cloudy. Patchy freezing fog in the late evening and overnight. Very cold. Lows around zero. Temperature rising to around 8 above after midnight. South Winds 5 to 10 Mph. Wind chill Values as low as 15 below.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sugar River Forest Preserve Temperature Statistics

December Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 1 December, 2025

    5 °F

  • Average December

    18.9 °F

  • Highest 1 December, 2025

    28.4 °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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